with a potentiometer of 1Mohm and a resitor in series of 2kohm the opmap is a tl08119hz to 19500hz
If it's the one in post #1 then you could replace the pot with a CdS cell and illuminate the cell with a LED driven by a variable control voltage. It's sluggish, not an ideal approach and won't give a linear voltage-v-frequency response (I don't know if that's what you want, because you haven't answered the questions in post #3i already have a schematic
the problem is i ordered a pcb with that scematic on so i cant chane it but i can change th potentiometerThe circuit presented by bertus is your circuit with a voltage control.
around 20-20kHz +-15V no its not importantThe circuit you show probably isn't the best starting point for a VCO.
What frequency range are you hoping to get?
Is a linear relationship between control-voltage and frequency important? If so, what is the linearity tolerance?
What supply voltage?
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jake Hertz