Is there a 4080 missing from that socket?
Did you try installing one?
Where does the regulator get its input voltage?
Do you have an incandescent lamp (not CFL, not LED), low wattage is better?
Did you try installing one?
Where does the regulator get its input voltage?
Do you have an incandescent lamp (not CFL, not LED), low wattage is better?
No 4080. That board made for two ir21844s IC. Input coming straight from separate winding connected to rectifier.
As the amp start I get about 10v on opamps then goes down to 7.3v. I guess amp is shutting down.
OK. One question at a time.
Do you have an incandescent lamp (not CFL, not LED), low wattage is better?
Do you have an incandescent lamp (not CFL, not LED), low wattage is better?
That's a bit high but should be OK.
You'll need to clamp the FETs tightly to the heatsink for this. Connect wires to the rail caps and run it out from under the board so you can connect it to the lamp.
Connect the lamp and power up the amp. It should draw some current but the current draw should be no more than about 10 amps. If you don't see any problems with the amp powered up like this, re-check the DC voltage on the regulator.
You'll need to clamp the FETs tightly to the heatsink for this. Connect wires to the rail caps and run it out from under the board so you can connect it to the lamp.
Connect the lamp and power up the amp. It should draw some current but the current draw should be no more than about 10 amps. If you don't see any problems with the amp powered up like this, re-check the DC voltage on the regulator.
While doing a small mistake 4 fets blew. I removed all the otput fets. I checked the voltages now voltage on opamps reached 10v with current limiter. I am getting good low side waveform.
What I found is U1 and U2 not producing smooth sinewave. They are TLC2274 and LM837M.
Can I replace them with TL074?