The outputs aren't FETs in this amp. If they're TIP102s/107s, they darlington bipolar transistors.
If the emitters are tied together (via the emitter resistors), the collector of the TIP102 will go to the positive rail. You can either trace it to the positive terminal of the rail cap or to the rectifier.
I've had good luck with the FC series Panasonic caps (Digi-Key).
If the emitters are tied together (via the emitter resistors), the collector of the TIP102 will go to the positive rail. You can either trace it to the positive terminal of the rail cap or to the rectifier.
I've had good luck with the FC series Panasonic caps (Digi-Key).
Spoke too soon...
I got it installed in-car, and it blows fuse for 4th channel as soon as powered-up with/without speaker connected. Wiring in car good speaker good. Showing 22vdc across fuse terminal in the car.
on bench, testing just 4th channel with generator, it works/doesn't blow.
Have I got devices in there backwards?
Ideas?
I'm pulling it apart now...
Thanks!
paul
I got it installed in-car, and it blows fuse for 4th channel as soon as powered-up with/without speaker connected. Wiring in car good speaker good. Showing 22vdc across fuse terminal in the car.
on bench, testing just 4th channel with generator, it works/doesn't blow.
Have I got devices in there backwards?
Ideas?
I'm pulling it apart now...
Thanks!
paul
new problem
Sound is great from this!
Gain adjustment worked for a while, then,
All trim pots for gain suddenly have NO affect on input gain.
The gain seems to be 'stuck' at minimum sensitivity.
Is there any trick to this before I open it up?
Tried massaging switches with no change.
Thanks!
paul
Sound is great from this!
Gain adjustment worked for a while, then,
All trim pots for gain suddenly have NO affect on input gain.
The gain seems to be 'stuck' at minimum sensitivity.
Is there any trick to this before I open it up?
Tried massaging switches with no change.
Thanks!
paul
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