Are pins 6 and 7 directly connected by a trace on the board?
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 12:25 am #41 2019-02-11 12:25 am #41 Are pins 6 and 7 directly connected by a trace on the board? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 12:27 am #42 2019-02-11 12:27 am #42 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 12:43 am #43 2019-02-11 12:43 am #43 That's suspect. It's configured as a buffer. In that configuration, the output should match the voltage on the non-inverting input, almost exactly. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 12:55 am #44 2019-02-11 12:55 am #44 Is there another opamp I can use for testing or do I need the original ? I’m gonna order the correct part just wanna make sure the problem is solved before I order parts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 1:08 am #45 2019-02-11 1:08 am #45 It depends on how it's being used. If it's in the preamp, virtually any op-amp should work. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-02-11 12:27 am #42 2019-02-11 12:27 am #42 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 12:43 am #43 2019-02-11 12:43 am #43 That's suspect. It's configured as a buffer. In that configuration, the output should match the voltage on the non-inverting input, almost exactly. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 12:55 am #44 2019-02-11 12:55 am #44 Is there another opamp I can use for testing or do I need the original ? I’m gonna order the correct part just wanna make sure the problem is solved before I order parts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 1:08 am #45 2019-02-11 1:08 am #45 It depends on how it's being used. If it's in the preamp, virtually any op-amp should work. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 12:43 am #43 2019-02-11 12:43 am #43 That's suspect. It's configured as a buffer. In that configuration, the output should match the voltage on the non-inverting input, almost exactly. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 12:55 am #44 2019-02-11 12:55 am #44 Is there another opamp I can use for testing or do I need the original ? I’m gonna order the correct part just wanna make sure the problem is solved before I order parts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 1:08 am #45 2019-02-11 1:08 am #45 It depends on how it's being used. If it's in the preamp, virtually any op-amp should work. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
That's suspect. It's configured as a buffer. In that configuration, the output should match the voltage on the non-inverting input, almost exactly.
C caraudioguy2100 Member Joined 2010 2019-02-11 12:55 am #44 2019-02-11 12:55 am #44 Is there another opamp I can use for testing or do I need the original ? I’m gonna order the correct part just wanna make sure the problem is solved before I order parts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 1:08 am #45 2019-02-11 1:08 am #45 It depends on how it's being used. If it's in the preamp, virtually any op-amp should work. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
Is there another opamp I can use for testing or do I need the original ? I’m gonna order the correct part just wanna make sure the problem is solved before I order parts
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 1:08 am #45 2019-02-11 1:08 am #45 It depends on how it's being used. If it's in the preamp, virtually any op-amp should work. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-02-11 3:01 pm #46 2019-02-11 3:01 pm #46 Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
Original opamp was a AD826AN I replaced it with a BA4558 for testing the problem is still there full rail voltage on the output terminals
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:05 pm #47 2019-02-11 3:05 pm #47 What is the DC voltage on pin 1 of that op-amp now? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
C caraudioguy2100 Member Joined 2010 2019-02-11 3:27 pm #48 2019-02-11 3:27 pm #48 Pin 1:-4.75 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:33 pm #49 2019-02-11 3:33 pm #49 Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down. ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
Can you easily pull that IC? If the non-inverting input is still at 0v and pins 1 and 2 are connected, the voltage on pin 1 should be 0v. There's virtually no chance that you could have 2 defective op-amps. Maybe there's something pulling pin 1 down.
C caraudioguy2100 Member Joined 2010 2019-02-11 3:37 pm #50 2019-02-11 3:37 pm #50 If I pull the ic the voltage on pin one is at 0.00 volts ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE Top Bottom
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 3:39 pm #51 2019-02-11 3:39 pm #51 Does removing that op-amp affect the voltage on the output? Was the 4558 new? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE
C caraudioguy2100 Member Joined 2010 2019-02-11 3:51 pm #52 2019-02-11 3:51 pm #52 Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833 ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 US Amps AX-1500DE
Yes if I remove that opamp the voltage on the output drops to 0 And that opamp was new I can replace it again with a TL072 or a LM833
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:03 pm #53 2019-02-11 4:03 pm #53 Are the positive and negative power supplies for that op-amp approximately equal? ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 2019-02-11 4:18 pm #54 2019-02-11 4:18 pm #54 Yes I have -11.92 and +11.90 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 2019-02-11 4:52 pm #55 2019-02-11 4:52 pm #55 I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic . ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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
I think I found the problem one of the other opamp is defective the IL4558 is defective pulling the voltage down on the other ic .
P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 4:58 pm #56 2019-02-11 4:58 pm #56 Is the circuit in the attached diagram close to what you have? Attachments MD2.zip 776.9 KB · Views: 31 ••• More options Share C caraudioguy2100 Member Joined 2010 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 2019-02-11 5:07 pm #57 2019-02-11 5:07 pm #57 Yes ••• More options Share P Perry Babin Member Joined 2003 bcae1.com 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share Prev 1 2 3 First Prev 3 of 3 Go to page Go 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 2019-02-11 8:28 pm #58 2019-02-11 8:28 pm #58 Which op-amp on the diagram corresponds to the one that has DC offset in your amp? ••• More options Share