driver signals

timwebb · 22nd July 2010, 08:41 PM

ok i was wondering do traces distort signals cause i was checking some drivers on an amp that i replaced and the wave is perfect at the driver transistor but at the gate resistor it changes. or could it be my scope?

Perry Babin · 22nd July 2010, 08:48 PM

For that type of signal, there will be no visible difference if the trace is intact. There will be a difference if you're looking at the base of the driver transistor and the gate resistor or if you're looking at the signal after the gate resistor.

Are you looking at the signal on the emitter leg of the driver transistor and the end of the gate resistor that's not connected to the FET gate?

timwebb · 22nd July 2010, 09:03 PM

its the same i have and ground issue with my probe i changed probe and there the same now.they are just old i guess

Perry Babin · 22nd July 2010, 11:38 PM

You can buy cheap scope probes on ebay. They're only about $10 each and have been reliable. Buy from a US seller to get them more quickly.

timwebb · 22nd July 2010, 11:42 PM

ok i was looking at some smd removal stations since most amps are using smd parts now that would be a good one for a good price i seen some on ebay from hong kong and dont know how well they work.

Perry Babin · 22nd July 2010, 11:51 PM

Unless you have deep pockets, you don't need an SMD rework station. What SMD component have you had trouble replacing?

timwebb · 22nd July 2010, 11:59 PM

i fix some pc mother boards and hard drives and car radios, and that chip quick cost alot the only place i can get it from where i live its like 25 bucks.

Perry Babin · 23rd July 2010, 02:05 AM

OK. I can't help. I've never needed anything other than chipquik and a soldering iron.

22nd July 2010, 08:41 PM	#1
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	driver signals ok i was wondering do traces distort signals cause i was checking some drivers on an amp that i replaced and the wave is perfect at the driver transistor but at the gate resistor it changes. or could it be my scope?

22nd July 2010, 08:48 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	For that type of signal, there will be no visible difference if the trace is intact. There will be a difference if you're looking at the base of the driver transistor and the gate resistor or if you're looking at the signal after the gate resistor. Are you looking at the signal on the emitter leg of the driver transistor and the end of the gate resistor that's not connected to the FET gate? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd July 2010, 11:38 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You can buy cheap scope probes on ebay. They're only about $10 each and have been reliable. Buy from a US seller to get them more quickly. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd July 2010, 11:51 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Unless you have deep pockets, you don't need an SMD rework station. What SMD component have you had trouble replacing? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

23rd July 2010, 02:05 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	OK. I can't help. I've never needed anything other than chipquik and a soldering iron. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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22nd July 2010, 09:03 PM	#3
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	its the same i have and ground issue with my probe i changed probe and there the same now.they are just old i guess

22nd July 2010, 11:42 PM	#5
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	ok i was looking at some smd removal stations since most amps are using smd parts now that would be a good one for a good price i seen some on ebay from hong kong and dont know how well they work.

22nd July 2010, 11:59 PM	#7
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	i fix some pc mother boards and hard drives and car radios, and that chip quick cost alot the only place i can get it from where i live its like 25 bucks.

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