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Old 6th May 2012, 12:00 AM   #1
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Default Powerbass ASA1500.1Dx

One bank of fets heats up quickly after power up. Initially the gate signal on the supply looks clean then after 15 seconds it gets noisy and the outputs start to heat up.

Thoughts?
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Old 6th May 2012, 08:56 AM   #2
timwebb is offline timwebb  United States
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i still havent got mine to work right man.
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Old 6th May 2012, 01:00 PM   #3
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Does your driver card have a mixed mess of transistors? This one has 2n5401, 2n5501, A92,A56,A42's, not sure if that is right or not.
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Old 6th May 2012, 01:16 PM   #4
timwebb is offline timwebb  United States
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yep i replaced them all except the op amp. and the resistors between would go one at a time.
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Old 6th May 2012, 01:33 PM   #5
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Interesting, might be a PIA since you need fets populated for it to oscillate.

sent from your blown amp....
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Old 6th May 2012, 01:37 PM   #6
timwebb is offline timwebb  United States
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yea i know.they would blow every time installed new ones. i was going to replace the otpo couplers before i sat it to the side.
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Old 7th May 2012, 03:18 AM   #7
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With no outputs installed, you can drive a strong 100Hz signal into the amp and it will show up on the output gates. That will show you if the drive circuit is working at a basic level (but won't be a good indicator of the high frequency performance). It may be possible to inject an 80kHz signal into the amp but I've never tried it.
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Old 7th May 2012, 12:10 PM   #8
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Is there a reference schematic close to this driver board? Should this oscillate at 40Khz?
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Old 7th May 2012, 12:24 PM   #9
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There is a schematic for this type of driver board on the DVD (Generic Class D - Type 2, item #14).

The frequency of oscillation will vary for self oscillating amps but it's generally between 60kHZ and 160kHz.
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Old 7th May 2012, 12:35 PM   #10
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Thanks, I will give that a look.
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