10
Through-‐Zero VCO Manual 0.1
Equipment used:
Frequency counter, trimmer tool.
Calibration Procedure
1.
Connect the CV source (keyboard) to the VCO, either via the
16-pin header of front panel jack, and connect the frequency
counter to the Square wave output.
2.
Play A4 on the keyboard and adjust the Coarse and Fine
knobs until the VCO is generating a tone at 440Hz.
3.
Play A6 on the keyboard and trim the scaling adjustment
trimmer until the frequency counter reads 1760Hz.
4.
Repeat steps 2 and 3 until the trimmer no longer needs
adjustment.
5.
Check the scaling across the keyboard range to verify the
scaling accuracy. The frequency error should be <0.1% over 8
or more octaves.
Scaling
Adjustment
