2600 problems? - caps

[Rich Nelson]

Paul Perry wrote:
> 
> At 04:43 PM 26/10/97 -0600, you wrote:
> >I finally got my 2600 back...wheeee!  But while playing it this weekend,
> >I realized that I can get feedback from it if it's too close to my amp,
> >and I hear a tap from the amp if I tap on the speaker (or anywhere else
> >on the unit).
> 
> well, why not open it up and tap very gently until you hit the spot?
> (took me an embarassingly long time to find the screws under the handle)
> Incidentally, ceramic disc capacitors can be microphonic!!! hard2believe
> 
> paul perry melbourne australia

In fact... all caps can become cap. microphones... in particular, DC
blocking caps in the audio path.  They are sitting there with a
polarizing voltage across them, just waiting to get whomped through the
dielectric.

When I encounter this problem, I usually put a glop of RTV adhesive over
them.  But ceramics are certainly the worst offenders.  Yet another
reason to never design them into the audio path!!

rich
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