[sdiy] Synthacon/Steiner-Parker VCF inputs

[Ian Fritz]

At 10:31 AM 6/24/2009, Derek Holzer wrote:

>Originally my idea was to use a DPDT 3 way switch to select which input is 
>used. However, the need for grounding the other inputs has me a bit 
>stumped. Is there a mechanical or electronic solution to this problem?

Yes.  Use an opamp buffer with a largish input resistor to ground at each 
input.  When the input is not used the buffer will hold it at zero 
volts.  When it is used, the loading of the input resistor will be small, 
provided you drive from a lo-Z source.

Ian