I’m having trouble finding ideas for this while trying to adapt MI/Befaco schematics of cv inputs and googling.
After some experimenting with my breadboarded gerassic organ, I realized that I could vary the resistance for the resistor connecting pins 1 and 3 of the TL082 (output and non-inverting input of one of the opamps) in the circuit to create a sort of master pitch control.
Currently I have a B2M pot (with 1 outside leg shorted to the center leg) in place of the resistor.
Ideally, I’d like to have a cv input as well as that pot to control the resistance value.
Are there any ways to achieve this with BJTs (547/557) or Opamps (TL072/082/LM358)? Everything online I’m finding involves JFETs, Vactrols, or Voltage Controlled Resistor chips which I do not currently have. Maybe the answer is no (or it would do a poor job) so I need to put in an order for some more parts…if that is the case which of these would be the best path to go down (preferably not vactrol as that would be costly and prone to breaking if I ever made a handful of these for others I’d think)