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Old 14th September 2020, 10:24 PM   #1
ian33 is offline ian33
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When a speaker is connected amp will go in and out of protect continuously .signal on the outputs look good.I see 633mv offset on output terminals.

Any suggestions?

What normally goes bad on these driver boards?

So far only thing I find was a bad 5v regulator which supply Voltage to the driver board.
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Old 14th September 2020, 10:45 PM   #2
Perry Babin is offline Perry Babin  United States
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Remove the rectifiers. Does it go into protect?
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Old 15th September 2020, 01:55 PM   #3
ian33 is offline ian33
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With rectifiers out it does not go in protect.
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Old 15th September 2020, 05:13 PM   #4
Perry Babin is offline Perry Babin  United States
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Do you have a drive signal on the gates of all of the output FETs?

If you don't have any drive, you may need to drive a signal into the amp.
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Old 15th September 2020, 05:49 PM   #5
ian33 is offline ian33
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Yes all gates have drive signal
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Old 15th September 2020, 08:51 PM   #6
Perry Babin is offline Perry Babin  United States
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Are the drive signals clean and driving back to the FET source?

You may need to load the speaker terminals for the high side.

What is their amplitude?

What is the duty cycle?
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Old 15th September 2020, 11:47 PM   #7
ian33 is offline ian33
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I track the problem down to a bad op-amp in the preamp circuit.
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