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Old 25th January 2006, 07:23 AM   #1
bkfix is offline bkfix  Canada
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Default power amp output -help-

I think i'm getting rail volage at the output of my amp.
i only tap the switch on for a second and its putting lots of voltage out the speaker terminals i think dc?

i soldered new offset and bias pots in. becase one of them blew. during this split second test one pot warms up like its gonna blow again.

does this mean my mosfets are toast shorting it out?

bk components pro-600, class ab

i have schematics. can post pics of the case.
any advice on just using the case and PS and designing new driver boards for it.
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Old 25th January 2006, 09:02 AM   #2
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Default Re: power amp output -help-

Quote:
Originally posted by bkfix

i have schematics. can post pics of the case.
any advice on just using the case and PS and designing new driver boards for it.
Then what are you waiting for.......

K a n w a r
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Old 25th January 2006, 09:57 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
sounds like excessive voltage feeding that failed pot.
Shorting component in that region of the PCB? or a short across a pair of PCB tracks?
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Old 25th January 2006, 02:06 PM   #4
lineup is offline lineup  Sweden
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Default Re: power amp output -help-

Quote:
Originally posted by bkfix
I soldered new offset and bias pots in
If something is wrong with a bias potentiometer
it can destroy a lot in an amplifier

Be sure to always control that bias pot is okay and attached correctly.

A little fault here and it can make real fatal error
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