To bring this up again, could someone point me to the caps in my JP on the soundboard that I would change to try to clear this up?
Any luck with this guys? I'm going to try to replace the cap this weekend and see what happens.
Well, recapped the entire sound board and have a new XPIN power supply and the buzz is still there, and possibly worse. It was the same with the new caps and the old supply, with the new supply it might be a bit worse.
I've tested the grounds and they show continuity from the head to the body etc.
Could it be the display? There is an issue with the display, I'm just curious if that could be inducing the noise in the audio.
Quoted from robertmee:
Go to your breaker box and start shutting off power to various appliances in your home. I betcha the source of your hum goes away.
Transformers act as low pass filters, but they aren't complete line filters. Especially considering the primary and secondary grounds are tied together physically, so high freq hum will come through the ground.
If that were the case, wouldn't my williams machine buzz too?
Quoted from castlesteve:
I have a solution. I'll be testing it tonite... just scrounging my parts bin for the right items. Maybe RadioShack will have what I need. I've cross referenced it with 3 other schematics (and a VCR), and sure enough, the values on the DE board appear to be wrong. muhaaahahaa.
Please let us know, I'm surprised that a new power supply didn't solve this though...
Would a switching power supply like that introduce ripple as well? I'm no electronics genius certainly, but I seem to remember that is a negative property of that scheme?
I'm just curious why a missing screw could cause a hum, aren't all the grounds connected together on the ground trace on the board?
I replaced all the caps on the soundboard, with the manual suggestions, and a brand new XPIN power supply. I'll try replacing c31 and c52 with 1000uF and see if that helps, but I'm pretty sure it ain't.
Any validity to the post above changing out some resistors to lower the gain, the theory is that the output is just driven too high...
Well Crash, as far as I can tell, no, the XPIN supply isn't providing a clean source either. Which is strange right. No offense to the XPIN developers, but I paid good money...
That's what were trying to do in this thread, hunt it down and fix it.
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