HP VCF 111 V1d
3
Assembly Instructions
The LP VCF module has no particular requirements not already covered in the ‘General
Guidance on a M²Synth Module Assembly’ booklet included with this kit.
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%, Cut-off
to 0%, Signal 1 Level to 100%.
3.
Adjust Pr1 to give a 10V Pk-Pk output using an oscilloscope
4.
Remove the sine wave signal from input 1. Set resonance to 100%. Connect a
frequency meter to the output.
5.
Adjust Cut-off to give 100Hz
6.
Apply a CV of 4V to the COF CV in 1 input
7.
Use Pr2 to calibrate at 1.6kHz (see note below)
8.
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
Specification
Supply v/-12Vdc
Supply c13mA / -16mA
Waveform /-5V
Frequency range: 19Hz to 15kHz without any CV applied
Main PCB dimensions 43.5x130mm
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