Could the problem possibly be with the DVM?
Try putting like a 5k resistor between +12 and ground, see if that makes the
oscillator drift.
John P.
Jim Johnson wrote:
Try putting like a 5k resistor between +12 and ground, see if that makes the
oscillator drift.
John P.
Jim Johnson wrote:
> <sigh> Me and my beat up Serge panel....
>
> Now I'm suspicious of the power supply. I hooked it up today, just to check
> the basic functionality of the PS, and lo and behold: When I hook a DVM to
> any of the PS pins - + 12, -12, or even 5 V - I hear an audible change in
> the oscillator pitch. PS voltages look ok, if not well calibrated: they're
> off by ~100 mV, not symmetric. But that doesn't bother me anywhere near as
> much as the oscillator pitch change.
>
> How much current should I expect a single panel to draw? My supply is
> supposed to supply 400mA at both + and - 12 v. Seems like it should be
> enough.
>
> Jim Johnson
> jamos@...
>
>
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> Keep on Patchin'!
>
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