It shouldn't shut down at 13.8 but that's not a big deal at this point.
Have you checked all of the output transistors to see if any were shorted?
Have you checked all of the output transistors to see if any were shorted?
Maybe something to consider, the amp was hooked up backwards but no remote on given to it. The amp worked perfectly before this. What, other than the power supply FET's could have been damaged?
No, it's just a bench supply. I have two supplies, one is limited at 5A other is limited at 10A. Both repeatedly hit limiting before shorting C2. The same amp did not hit limit at all before it was damaged (I tested it on the bench for him a while back). Even with C2 shorted, it still hits limit on initial poweron.
One more thing, although the supply is stable, it does not pass audio with C2 shorted. If I unshort C2, it goes back to the repetative overcurrent and passing audio on/off/on/off.
Remove the C2 jumper and jump across the collector and emitter of Q18.
Clamp the transistors tightly to the heatsink.
Connect your meter across one of the 0.1 ohm source resistors in one of the channels and power the amp up just long enough to read the meter. Do any of the resistors read above 0.000v DC when you power up the amp?
Clamp the transistors tightly to the heatsink.
Connect your meter across one of the 0.1 ohm source resistors in one of the channels and power the amp up just long enough to read the meter. Do any of the resistors read above 0.000v DC when you power up the amp?
Are the pots fully CW or fully CCW?
You can remove the jumper on the transistor.
Solder the diodes back down if you haven't (and re-check drive signals).
You can remove the jumper on the transistor.
Solder the diodes back down if you haven't (and re-check drive signals).
Pots were CCW, now they are CW. I removed the jumper and resoldered the diodes.
Drive signals look OK, no more cycling.
Still shuts off over 13.6V.
Drive signals look OK, no more cycling.
Still shuts off over 13.6V.
No.
DC voltage on all terminals of the LM339. Copy and paste the following list and fill in the blanks. If there is no blank space after the colon, add one between the colon and the numbers you enter. It makes it much easier to read.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
DC voltage on all terminals of the LM339. Copy and paste the following list and fill in the blanks. If there is no blank space after the colon, add one between the colon and the numbers you enter. It makes it much easier to read.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Voltages are +/- 0.1 the scope isn't super accurate.
Pin 1: 4.85
Pin 2: 4.85
Pin 3: 14.72
Pin 4: 0
Pin 5: 2.03
Pin 6: 4.23
Pin 7: 5.0
Pin 8: 5.0
Pin 9: 5.4
Pin 10: 5.0
Pin 11: 8.0
Pin 12: 0
Pin 13: 4.8
Pin 14: 15.2
Pin 1: 4.85
Pin 2: 4.85
Pin 3: 14.72
Pin 4: 0
Pin 5: 2.03
Pin 6: 4.23
Pin 7: 5.0
Pin 8: 5.0
Pin 9: 5.4
Pin 10: 5.0
Pin 11: 8.0
Pin 12: 0
Pin 13: 4.8
Pin 14: 15.2