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DaveC
Guest
In my 400W audio power amp, a power MOSFET died, I think. The speaker output
from one of the channels is 5.5v DC, whereas it's supposed to be zero.
Configuration is 3 parallel MOSFETs connecting the output to the plus rail,
and 3 connecting it to the minus rail.Rails are plus and minus 68v, nominal,
no ripple.
Can I just remove the failed plus-side MOSFET from the circuit? If I can do
this, should I also remove one of the minus-side ones from that channel, as
well?
Eventually I'll look into exactly what has failed (MOSFET, driver FET, or
some passive component), but right now I just want to get the amp's output
back to zero and use it right away.
How can I easily determine which of the three MOSFETs has failed?
This amp is a little-known brand (VSP Labs) from a small, long-closed
company, so no schematics or repair documentation is available.
Suggestions?
Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
from one of the channels is 5.5v DC, whereas it's supposed to be zero.
Configuration is 3 parallel MOSFETs connecting the output to the plus rail,
and 3 connecting it to the minus rail.Rails are plus and minus 68v, nominal,
no ripple.
Can I just remove the failed plus-side MOSFET from the circuit? If I can do
this, should I also remove one of the minus-side ones from that channel, as
well?
Eventually I'll look into exactly what has failed (MOSFET, driver FET, or
some passive component), but right now I just want to get the amp's output
back to zero and use it right away.
How can I easily determine which of the three MOSFETs has failed?
This amp is a little-known brand (VSP Labs) from a small, long-closed
company, so no schematics or repair documentation is available.
Suggestions?
Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group