Copying over from elsewhere since it’s relevant to this thread:
One more thing to note is that with the typical resistor/capacitor values, the 3340 is calibrated to behave nicely from ~1 Hz all the way to 20 kHz and beyond, and you have to feed in quite a bit of voltage to get an audible signal.
Assuming nominal resistor/capacitor values, the 10k tracking pot set to the middle position, and that I didn’t completely screw up my algebra, the CV for a given frequency is:
cv = 1.463 * ln(freq) + 0.239so for e.g. 440 Hz you need to feed in just over 9 V in total (coarse tune + CV).
The coarse tune on its own gives you a range of just under 1 Hz to 3100 Hz:
(note that the above equation isn’t exactly 1 V/octave, that’s what the tracking pot is there for)
