Re: Suggestions

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In Reply to: Re: Suggestions posted by johng@clarkretirement.org on December 29, 2006 at 11:18:06:

No, they're not, unless your device has separate power supplies for each channel. Sometimes there are "semi" separate power supplies. These might consist of an unregulated bulk supply feeding separate regulators for each channel. If that's the case, one of those might be bad. Other than that, carefully examine the board for crap (something might be partially conducting where it shouldn't), something hot (at those voltages it should be safe to use your fingers), something dirty.
If none of that pans, start checking voltages, different points in one channel with the same point in the other. You probably want to use a shorted input, and look for ac signal. Use a 'scope, if you have one. When you find the hum, you're pretty close to finding the culprit.
Also, take a look at routing of power cords. Has that changed any?

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Follow Ups Full Thread

Topic - Slight hum in Dahlquist LP1 elctronic crossover - johng@clarkretirement.org 07:43:16 12/29/06 (7)

Suggestions - lipmanl 09:00:51 12/29/06 (2)

Re: Suggestions - johng@clarkretirement.org 11:18:06 12/29/06 (1)

Re: Suggestions - lipmanl 11:35:54 12/29/06 (0)

I think you ought to sell it and the schematic to me for about $150. :-) - jeffreybehr 08:21:37 12/29/06 (3)

Re: I think you ought to sell it and the schematic to me for about $150. :-) - johng@clarkretirement.org 11:27:55 12/29/06 (2)

Re: I think you ought to sell it and the schematic to me for about $150. :-) - soundoc03 22:21:47 12/29/06 (0)

TYVM. (NT) - jeffreybehr 13:10:31 12/29/06 (0)

Follow Ups

Re: Suggestions - lipmanl 11:35:54 12/29/06 (0)

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