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[jhaible]

> 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?

Sure.

The BF filters use one center tapped LDR to get two variable
resistors. The coupling to the other sheet is by the LEDs that
are enclosed together with the LDRs.

JH.