BP VCF 113 V1c
3
Assembly Instructions
The Band Pass 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%, 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.
Specification
Supply v/-12Vdc
Supply c13mA / -16mA
Waveform /-5V
Frequency range: 7Hz to >5.5kHz without any CV applied
Main PCB dimensions 43.5x130mm
Need tech support, post questions on our forum hosted by modwiggler.com
