1. electrocreative says:

    Which photoresistor values are recommended, i.e. resistance value when dark and resistance at illuminance?

  2. Steve Harmon says:

    We use: GL5516 photo resistors:
    Light Res.: 5-10K ohm Dark Res: > .5M ohm

  3. George says:

    If I use a CMOS version of the IC can I use the 5 v supply from the board inside my VSS 30?

  4. Steve Harmon says:

    Hey George,

    The optical theremin should have no problem running off 5V.


  5. Michael says:

    Can this be used as an input to the APC? We basically want to use the photoresistors to control the tones coming out of the APC (and eventually replace the photoresistors with a real theremin).

  6. Synthrotek says:

    Hi Michael, sure! The audio signal can still control the CV input of the APC, though I haven’t tried that with these two circuits, so I’m not sure of the range.

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