[sdiy] ASM1 VCO input question

[>>>marjan<<<]

> If you don't want to use them at all, don't even mount
> relating 100k resistors. If you connect them to panel
> jack, they can be left open, but if you are purist,
> use ground switching jacks.
> 
> It will not affect 1V/oct trimming in any way no matter
> if they are left open or tied to GND. It's a summing
> node at voltage close to 0V (2-3mV, ideally 0V), so
> any resistance you put between this point and GND
> can't cause any significant current flow, hence, no
> influence on rest of the circuit.

One thing to consider (but not crucial) is to recalculate
R9, the res from noninv input to gnd, it should be
calculated from parallel feedback res and all summing
input resistors - ie. you have 2 inputs (100kX2)
then r9 is 33k (10k trim is not important)

And it's summing opamp. Not sure if mixing would mean
something different here.

-- 



marjan


me    : Marjan Urekar
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