Yes I was checking it on the opamp. You had me probe 4,5,7, and 8. I never looked at or measured pin 6. I was just confused about the message you sent last night, I thought you were referring the the octocoupler not the opamp. Then I read it again later and realized I was mistaken. So yes all the voltages and pics of scope were from the opamp (5532).
pin 6 is going to be a reduced version of the output of the amplifier.
Did you replace the op-amp?
Did you replace the op-amp?
Not yet. Il have to order one. While I order it I minaswell order the ps fets and a few resistors.
I dont have any surface mount parts on hand. I have a few different op amps but they are not surface mount. I asked a buddy who lives close by and he also has nothing that would work.
With no load, on the scope, do you see audio on the output?
Is the limiter inline with the rectifiers or not?
Is the limiter inline with the rectifiers or not?
Confirm that you have clean audio reaching pin 5 of the 5532. If so, post waveforms of the output with and without a load. 5v/div, 2ms on the scope.
Scope set to 50v/div and 5us, what signal do you have on the shunt resistors near the output transistors?
Is the intensity of the scope max'd out?
It looks like it's shutting down.
I'm guessing that the jumper is off of the capacitor.
Is the DCV across the B+ and ground terminals of the amp at least 12v and steady/solid?
It looks like it's shutting down.
I'm guessing that the jumper is off of the capacitor.
Is the DCV across the B+ and ground terminals of the amp at least 12v and steady/solid?
I'm not sure why the scope is so dim when measuring that. Also the voltage was a little low so I wired up a older 50 amp power supply that wont act funny and it didnt make a difference. Trying to play audio through the amp it is acting very strange. When I spin the gain I can somtimes get like a pulse of the signal out and can hear a up and down whining sound through the speaker allmost like tuning a am radio. The jumper is off the capacitor.
If the speaker pulses DC when you adjust the gain, the THAT 2155 (or whatever they used) could be bad but if you're getting clean audio through to the 5532, it's not a problem (at this point).
Is LED238 constantly lit after a short mute delay?
Resistance from the shunt resistors to the positive speaker terminal (nothing connected to the speaker terminals).
Adjusting the trigger level on the scope may give a better display.
Do you commonly use your scope in the 5-10us range?
Re-set the cal/var knobs for the timebase and vertical amplifier to the cal position.
Is LED238 constantly lit after a short mute delay?
Resistance from the shunt resistors to the positive speaker terminal (nothing connected to the speaker terminals).
Adjusting the trigger level on the scope may give a better display.
Do you commonly use your scope in the 5-10us range?
Re-set the cal/var knobs for the timebase and vertical amplifier to the cal position.