Description

Whiteface is based on the legendary ARP4023 VCF module often found in the “whiteface” ARP Odyssey Mk1.

Frequency Central have engineered out the rare parts and need for matched transistors by using a Roland-inspired circuit instead, but no change to the vibe!

The audio path remains pure ARP, with one exception – built as specified on the schematic, the resonance would clip in a way which is neither musical or desirable when set too high, so the circuit has been adjusted so that the resonance is usable and musical over the entire range!

As we’re bringing part of a hardwired synth to modular, it’s also necessary to buffer the output. This has been done using an inverting buffer, which also adds a bit of gain to bring it up to modular levels. A nice side effect of the inverting buffer is, that if you mix the input signal with the filter output, and find the sweet spot, you can do highpass filtering too!

Note: kit may include either black or white knob

Whiteface – Build Document

Specs:

• Depth: 35mm
• Width: 8HP
• 12V draw: 6mA
• -12V draw: 7mA