quick question

timwebb · 3rd January 2011, 02:11 AM

quick question im working on this memphis amp but the same output keeps blowing.

Perry Babin · 3rd January 2011, 02:40 AM

If it has parallel outputs, check the gate resistor for the one blowing and confirm that the connection between the gate leg and the gate resistor terminal reads 0 ohms.

timwebb · 4th January 2011, 01:31 AM

also could a gain pot cause distortion?

Perry Babin · 4th January 2011, 02:53 AM

It could have an intermittent connection (either on the wiper or on the terminals) that could cause the signal to be distorted. Where the pot is in the feedback loop it could cause the signal to become extremely distorted if it opens or has a bad connection.

Can you post a photo of the distorted signal?

timwebb · 5th January 2011, 12:59 AM

...

timwebb · 5th January 2011, 02:45 AM

when it plays it sounds full of static and when bass hits it cuts out and comes back in.

Perry Babin · 5th January 2011, 02:49 AM

Set the scope to 5v/division. Drive a sine wave into it (50-100Hz) to a level that will deflect the trace on the scope ±3 divisions. Set the timebase on the scope so that there are ~3 full cycles displayed. You don't need to have a speaker connected. Post a photo.

3rd January 2011, 02:11 AM	#1
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	quick question quick question im working on this memphis amp but the same output keeps blowing.

3rd January 2011, 02:40 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it has parallel outputs, check the gate resistor for the one blowing and confirm that the connection between the gate leg and the gate resistor terminal reads 0 ohms. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

4th January 2011, 02:53 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It could have an intermittent connection (either on the wiper or on the terminals) that could cause the signal to be distorted. Where the pot is in the feedback loop it could cause the signal to become extremely distorted if it opens or has a bad connection. Can you post a photo of the distorted signal? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th January 2011, 02:49 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Set the scope to 5v/division. Drive a sine wave into it (50-100Hz) to a level that will deflect the trace on the scope ±3 divisions. Set the timebase on the scope so that there are ~3 full cycles displayed. You don't need to have a speaker connected. Post a photo. __________________ 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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4th January 2011, 01:31 AM	#3
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	also could a gain pot cause distortion?

5th January 2011, 02:45 AM	#6
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	when it plays it sounds full of static and when bass hits it cuts out and comes back in.

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