1973 VCF DIY There is also a HOLD

There is also a HOLD input that will freeze the envelope in its current state

You are now ready to install power in your case

Stepped section - With the Smooth Function patched to cycle

You will need to choose the right transistor to get the correct Noise waveform as shown in the next photo

Only tighten until snug

1973 VCF DIY There is also a HOLDThe 1973 Paperface VCF is a state variable 2 pole resonant filter that offers lowpass, bandpass and highpass outputs simultaneously. 1973 VCF BOM 1973 VCF Panel The two CA3080's are not included in the BOM. This part can be purchased HERE Calibration Input a sawtooth waveform into the audio input of the VCF with the cutoff frequency control fully counter clockwise. Patch a cable out of the lowpass filter and monitor the output level. Adjust the FREQ