It is also possible that the problem is in the control voltage circuit
rather than the timing circuit. I am wondering if the CV control range
varies greatly like the pot control range.
Don't worry about the pot VR1 - variance here will make no difference.
Here are things to check in the CV control circuit:
R5 - controls the range of rate pot
R6 - sets the initial frequency (summed with rate pot)
R7 - controls the gain of the CV circuit
R8 (tempco), R9, R10, and R11 need to be checked.
Larry
rather than the timing circuit. I am wondering if the CV control range
varies greatly like the pot control range.
Don't worry about the pot VR1 - variance here will make no difference.
Here are things to check in the CV control circuit:
R5 - controls the range of rate pot
R6 - sets the initial frequency (summed with rate pot)
R7 - controls the gain of the CV circuit
R8 (tempco), R9, R10, and R11 need to be checked.
Larry
----- Original Message -----
From: paulhaneberg <phaneber@...>
I would check the value of the timing capacitor and also of the resistors in
the timing circuit. <snip> Make very sure that the value of the timing
capacitor matches the schematic and that it is not off by a factor of 10.
Then check the resistors around the timing cap.