BP VCF 113 Build Guide

Assembly Instructions

The BP VCF 113 module has no particular build requirements not already covered in the ‘General Build Info' page.

Calibration

1. Power up module and allow to ‘warm up’ for 10 minutes
2. Connect a 440Hz sine wave @ 10V Pk-Pk to Signal input 1. Resonance to 0%, Signal 1 Level to 100%.
3. Adjust cut-off to give maximum amplitude output using an oscilloscope.
4. Adjust Pr1 to give a 10V Pk-Pk output.
5. Remove the sine wave signal from input 1. Adjust resonance until self-oscillation occurs at approximate 10V pk-pk. Connect a frequency meter to the output.
6. Adjust Cut-off to give 100Hz
7. Apply a CV of 4V to the COF CV in 1 input
8. Use Pr2 to calibrate at 1.6kHz (see note below)
9. Repeat from step 5 until 4V gives 1.6kHz

Note: If the frequency is flat (<1.6kHz), use Pr2 and make the frequency lower (flatter), if above target frequency, use the trimmer to make the frequency even higher, this can be counter-intuitive. You will soon get the feel of how much to increase or decrease the frequency by.

PCB Parts List

*See below for MOTM or MU Potentiometers

Module Parts List

 PCB Layout