Scope settings 10 us 5volts/div 2 0.1 if caps in series across gate and source here is what I get
C caraudioguy2100 Member Joined 2010 2019-12-10 8:20 am #21 2019-12-10 8:20 am #21 Scope settings 10 us 5volts/div 2 0.1 if caps in series across gate and source here is what I get Attachments B7BC1709-FA28-4EF0-B28E-B4A75860C6D3.jpg 789.5 KB · Views: 55 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:29 am #22 2019-12-10 8:29 am #22 Does the PNP driver have its collector directly connected to ground? Source, the 3rd leg? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:34 am #23 2019-12-10 8:34 am #23 Yes the collector (middle leg) connects directly to ground And yes 3rd leg of the fet source leg ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:40 am #24 2019-12-10 8:40 am #24 Is the signal the same on both banks? Is the signal on the base of the two drivers a clean square wave like this was before loading? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:53 am #25 2019-12-10 8:53 am #25 Yes both banks are the same . And the waveform on the drivers is good like before loading it. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:29 am #22 2019-12-10 8:29 am #22 Does the PNP driver have its collector directly connected to ground? Source, the 3rd leg? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:34 am #23 2019-12-10 8:34 am #23 Yes the collector (middle leg) connects directly to ground And yes 3rd leg of the fet source leg ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:40 am #24 2019-12-10 8:40 am #24 Is the signal the same on both banks? Is the signal on the base of the two drivers a clean square wave like this was before loading? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:53 am #25 2019-12-10 8:53 am #25 Yes both banks are the same . And the waveform on the drivers is good like before loading it. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-12-10 8:34 am #23 2019-12-10 8:34 am #23 Yes the collector (middle leg) connects directly to ground And yes 3rd leg of the fet source leg ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:40 am #24 2019-12-10 8:40 am #24 Is the signal the same on both banks? Is the signal on the base of the two drivers a clean square wave like this was before loading? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:53 am #25 2019-12-10 8:53 am #25 Yes both banks are the same . And the waveform on the drivers is good like before loading it. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:40 am #24 2019-12-10 8:40 am #24 Is the signal the same on both banks? Is the signal on the base of the two drivers a clean square wave like this was before loading? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:53 am #25 2019-12-10 8:53 am #25 Yes both banks are the same . And the waveform on the drivers is good like before loading it. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
Is the signal the same on both banks? Is the signal on the base of the two drivers a clean square wave like this was before loading?
C caraudioguy2100 Member Joined 2010 2019-12-10 8:53 am #25 2019-12-10 8:53 am #25 Yes both banks are the same . And the waveform on the drivers is good like before loading it. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-12-10 10:34 am #26 2019-12-10 10:34 am #26 Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts . ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
Replaced the chipset (494) and replaced the drivers again . The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts .
C caraudioguy2100 Member Joined 2010 2019-12-10 11:09 am #27 2019-12-10 11:09 am #27 Here is what I get if I load it with a fet instead of caps . Scope settings 10us 5 volts /div Attachments 8DF84AA5-4B47-49C8-8474-9868B43E3C02.jpg 731.9 KB · Views: 45 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 4:10 pm #28 2019-12-10 4:10 pm #28 That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)? If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps.
C caraudioguy2100 Member Joined 2010 2019-12-10 6:46 pm #29 2019-12-10 6:46 pm #29 Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ? The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:05 pm #30 2019-12-10 7:05 pm #30 The drivers are likely OK. What are the pulldown resistor values? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-12-10 7:18 pm #31 2019-12-10 7:18 pm #31 There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 7:23 pm #32 2019-12-10 7:23 pm #32 With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE Top Bottom
With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two?
C caraudioguy2100 Member Joined 2010 2019-12-10 7:27 pm #33 2019-12-10 7:27 pm #33 Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE
Resistance from pin 9 to pin 10:0.946k Resistance from pin 9 to pin 7:0.474k Resistance from pin 10 to pin 7:0.471k
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 8:12 pm #34 2019-12-10 8:12 pm #34 Do you see a 470 ohm resistor connected across the points that are reading 470 ohms? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home General Interest Car Audio Audio Art 260.6XE
C caraudioguy2100 Member Joined 2010 2019-12-10 8:38 pm #35 2019-12-10 8:38 pm #35 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
P Perry Babin Member Joined 2003 bcae1.com 2019-12-10 9:01 pm #36 2019-12-10 9:01 pm #36 What does the drive signal look like on pins 9/10 of the 494? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
C caraudioguy2100 Member Joined 2010 2019-12-10 9:18 pm #37 2019-12-10 9:18 pm #37 Scope is 10us 5 volts/div Here is what I get on pins 9/10 they look the same Attachments 1D9FA1A7-894D-47FA-A5AF-62BC97AC20C2.jpg 707.7 KB · Views: 31 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 12:27 am #38 2019-12-11 12:27 am #38 If you see the same signal at the base of the drivers, the drivers are bad. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
C caraudioguy2100 Member Joined 2010 2019-12-11 4:04 am #39 2019-12-11 4:04 am #39 Would the 2n4401/4403 work to replace the originals C945 and A733? ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share Prev 1 2 3 4 Next First Prev 2 of 4 Go to page Go Next Last Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
P Perry Babin Member Joined 2003 bcae1.com 2019-12-11 4:08 am #40 2019-12-11 4:08 am #40 You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads. ••• More options Share
You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK. The pin configuration is different so you'll have to twist the base and emitter leads.