Micro computer speaker and amplifier build/design

[Johnloudb]

Thats what Russ White and Brian Donegan told me to use (they are the creators of the DAC) so I'm not sure. They said 10k would be to high. Something about distortion.

10k ohm isn't too high and won't affect distortion. The input capacitance and input bias currents are too small. But the op-amp Russ is using can easily drive a 600 ohm load with low distortion, so it doesn't matter. I just had to say that. :W

[Hdale85]

Yeah I don't know. I pulled the metronome out of the system and the noise almost goes away completely. I'm not sure why. It's just an ASRC reclocking module. Next I'll try a single DAC with the metronome and see how that works. Something has got to be causing the noise and I can't believe its because I'm running single ended off a balanced output because it wasn't making the noise before I got the second DAC module and the ASRC module.

[Johnloudb]

Yeah I don't know. I pulled the metronome out of the system and the noise almost goes away completely. I'm not sure why. It's just an ASRC reclocking module. Next I'll try a single DAC with the metronome and see how that works. Something has got to be causing the noise and I can't believe its because I'm running single ended off a balanced output because it wasn't making the noise before I got the second DAC module and the ASRC module.

That might do it. Unless there's a problem with the second DAC module. But, you pulled the metronome out, huh. So, sounds like an ASRC module problem, I guess.

[Hdale85]

Well no because the sound is still there without the ASRC. I tried it just now with a single DAC and the ASRC and I still have issues. Maybe its because I don't have a chassis ground or something? But there is no ground that I would connect to the chassis. It's in a project box from radio shack so no way to add a chassis ground.

[Johnloudb]

Most DACs have an analog filter at output to filter HF noise. But it shouldn't be easily audible. Don't think it's a chassis grounding issue. I don't know your setup, so it hard for me to suggest a solution.

[Hdale85]

Well here are a couple pictures.







2 boards on the bottom are the DAC boards the second is the metronome and top one is the USB module. They are different now being that all boards are stacked on top of each other but it didn't make a difference in the sound. I think I should try and hook up the MAC mini and see if maybe its an issue with my computer? But then I'd have to move it and stuff and I haven't felt up to that yet lol.

[Johnloudb]

Looks good. I think hooking up the MAC mini is good idea. could be a power supply issue too. Russ might have other ideas.

[Hdale85]

They stopped giving me idea's Brian was going to send me a bunch of resistors. I think I'm just going to get the Ballsie and be done with it.

[Johnloudb]

They stopped giving me idea's Brian was going to send me a bunch of resistors. I think I'm just going to get the Ballsie and be done with it.

Sorry to hear that. At least try the Mac Mini.

[Hdale85]

Yeah...just a pain to unhook it and move it.