Power amp outout stage self oscillation problem - Page 2 - diyAudio
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Old 19th November 2008, 05:22 AM   #11
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Join Date: May 2005
Location: HK
Seems I do not have this filter .

What the parallel value of this coil and resistor be used ? If I make it by myself how many turns of coated copper and its diameter be used?

Does it connect in series to the path of SPK (+) O/P ? Or in parallel ?

One more question about my AMP where the schematic shown that at the end of SPK output have (5 ohm in series with 0.1 u CAP) thing paralleled to SPK (+) and SPK (GND). What is their purpose ?
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Old 4th December 2008, 02:05 PM   #12
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Join Date: May 2005
Location: HK
Report my test result...

Seems the main problem is the O/P FET incur the oscillation. I had tried a Zobel filter but no function to the problem. After that I just only parallel 30n cap to FET's drain-gate and 270p cap to gate-source. (I observed some Japanese' design have this stuff) Lastly the whole circuit turn quiet.

Anyway, thanks to all of your valuable comments :P

CK
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