DCV across pins 5 and 6 of U2?
Is pin 7 noisy?
U2, pin 8, triangle waveform? What amplitude?
Is pin 7 noisy?
U2, pin 8, triangle waveform? What amplitude?
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Does one of the 2 speaker outputs have significantly more noise than the other?
Do you have the PHD2 diagram?
Do you have the PHD2 diagram?
I don't understand #64.
Does one of the 2 speaker outputs have significantly more noise than the other?
Do you have the PHD2 diagram?
Does one of the 2 speaker outputs have significantly more noise than the other?
Do you have the PHD2 diagram?
I do not have the phd2 diagram Currently
Sorry the noisy on both terminals sound the same with no audio input and subwoofer on output
Sorry the noisy on both terminals sound the same with no audio input and subwoofer on output
Elektrotanya has several Earthquake diagrams if you want others.
Check the cap across terminals 6 and 7 of U2. The output of that op-amp shouldn't have a triangle waveform that large.
On the end of resistors NOT connected to U2, R14 and R16 (PHD2 diagram), is the terminal of either of those resistors noisy?
I don't remember and can't find the waveform, did you say that pin 7 of the 4080 had a triangle waveform?
Check the cap across terminals 6 and 7 of U2. The output of that op-amp shouldn't have a triangle waveform that large.
On the end of resistors NOT connected to U2, R14 and R16 (PHD2 diagram), is the terminal of either of those resistors noisy?
I don't remember and can't find the waveform, did you say that pin 7 of the 4080 had a triangle waveform?
Perry I pulled the lm837 that I replaced and installed another new on and now the amplifier has no noisy on the outputs with subwoofer connected and no audio signal.
Do you think the 50v 47uf cap is sufficient or do you recommend a different value?
Do you think the 50v 47uf cap is sufficient or do you recommend a different value?
Is the triangle on pin 7 of U2 less or absent?
The cap will see full rail voltage so if it's more than 50v, it likely won't survive. I'm assuming that you're referring to the cap designated EC1 on the diagram.
Did the two LM837s come from different distributors or different batches?
The cap will see full rail voltage so if it's more than 50v, it likely won't survive. I'm assuming that you're referring to the cap designated EC1 on the diagram.
Did the two LM837s come from different distributors or different batches?
Nichicon makes a 22uf 100v BP. You'll find it on Digikey. That's what I use in these. 100v is overkill for your amp, but it helps to simplify stock. Less bins, more bulk purchasing power.