Precisely, what is normal ±rail voltage?
What is the DCV on the positive rail when there is a change in rail voltage?
What is the DCV on the negative rail when there is a change in rail voltage?
Use the secondary ground as the reference (black probe) when measuring those points.
What is the DCV on the positive rail when there is a change in rail voltage?
What is the DCV on the negative rail when there is a change in rail voltage?
Use the secondary ground as the reference (black probe) when measuring those points.
Rail voltage is +|- 35v at idle
When the change happen + rail goes as high as 93v while - rail goes to -22v
When this is happening the audio starts to distort.
When the change happen + rail goes as high as 93v while - rail goes to -22v
When this is happening the audio starts to distort.
Are you using the secondary ground as the reference point?
I've never seen this happen on this type of amplifier but when it has, it's happened when one half of the FET drive circuit was damaged, allowing the inductor to act a bit like a flyback transformer/inductor.
To check drive, you may need to go to differential mode if you have a mains powered scope. If you have a battery powered scope with no connection to the mains supply, you can check the drive directly across the gate and drain for the output FETs.
I've never seen this happen on this type of amplifier but when it has, it's happened when one half of the FET drive circuit was damaged, allowing the inductor to act a bit like a flyback transformer/inductor.
To check drive, you may need to go to differential mode if you have a mains powered scope. If you have a battery powered scope with no connection to the mains supply, you can check the drive directly across the gate and drain for the output FETs.
Went back on this amp today and it’s stuck in protect.pin 10 on the sg3525 is 0.054v
Any suggestions
Any suggestions
That's correct for that pin. It has to be low for the IC to produce output. When above approximately 1/2v, the IC shuts down.
Are you sure that it was a 3525?
Copy and paste the following list and fill in the blanks with the DCV on that IC.
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:
Pin 15:
Pin 16:
Copy and paste the following list and fill in the blanks with the DCV on that IC.
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:
Pin 15:
Pin 16:
Yes 3525
Pin 1: 0.000
Pin 2: 5.18
Pin 3: 0.017
Pin 4: 0.414
Pin 5: 2.057
Pin 6: 3.743
Pin 7: 2.004
Pin 8: 0.331
Pin 9: 5.73
Pin 10: 0.052
Pin 11: 0.006
Pin 12: 0.000
Pin 13: 9.70/10.3
Pin 14: 0.007
Pin 15: 9.70/10.3
Pin 16: 5.18
Lm393
Pin 1: 1.180
Pin 2: 0.225
Pin 3: 2.568
Pin 4: 0.000
Pin 5: 0.004
Pin 6: 2.568
Pin 7: 0.262
Pin 8: 5.18
Pin 1: 0.000
Pin 2: 5.18
Pin 3: 0.017
Pin 4: 0.414
Pin 5: 2.057
Pin 6: 3.743
Pin 7: 2.004
Pin 8: 0.331
Pin 9: 5.73
Pin 10: 0.052
Pin 11: 0.006
Pin 12: 0.000
Pin 13: 9.70/10.3
Pin 14: 0.007
Pin 15: 9.70/10.3
Pin 16: 5.18
Lm393
Pin 1: 1.180
Pin 2: 0.225
Pin 3: 2.568
Pin 4: 0.000
Pin 5: 0.004
Pin 6: 2.568
Pin 7: 0.262
Pin 8: 5.18