Re: Audio Noise Problems (IIgs ROM 01)

["mdj" <mdj.mdj@gmail.com>]

Michael J. Mahon wrote:

> I'd be willing to bet that the problem is that the +12v filter
> capacitor needs replacing.  If there are any filter caps close
> to the audio amplifier, they'd be a good bet, too.

I think the design flaw is that there's insufficient
buffering/decoupling close to the amp circuit. It's probably a fairly
simply hack to throw in some reserve current nearby...

But certainly if it's more noticeable now that before, it indicates the
power supplies' filters are becoming marginal - an extremely common
problem. You'd be wise to replace the other caps while you're in there.

Matt