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[Sean Costello]

Dr. Jörg Schmitz wrote:
> 
> Hi DIYers.
> 
> Anthony Scott Clark has (somewhere) schems of the PS3100 Resonator, part
> 1 and 2.
> I understand nothing. How are part 1 and 2 connected together ?
> What does this resistor symbol with an ellipse around mean ? (In europe,
> we have other symbols, unfortunately).
> As I understand, Part 1 is the resonator itself and part 2 is used to
> set amount and resonsance frequency.
> But its all very unclear. Can someone help me?

The Korg PS-3100 resonators use dual Vactrols, a specific type of
optoisolator, as the method of changing the frequencies of the filters.
The parts marked F101, F102 and F103 on the schematic are the Vactrols. 
On the first part of the schematic, the circled resistors represent the
photocells inside of the Vactrols (2 per Vactrol). On the second part of
the schematic, the LEDs marked A, B and C are the LEDs inside of the
Vactrols. 

Hope this helps.

Sean Costello