Yusynth Arp 4072 VCF

pcb dated 2006 and includes latest changes (power connectors etc)

MOTM 2U panel

'bridechamber pcb parts kit' is the original 'brown bag' kit

synthCube kit includes panel, pcb, mounting brackets, pcb and panel parts, mounting hardware etc

the pcb uses 2XMFOS universal mounting brackets to  mount to the panel

links: arp vcf

from yves:

The ARP4072 filter equipped mostly the famous ARP2600 semi-modular synthesizer.
I designed my own version of this filter. I have included in the design an input buffer stage and an ouptut buffer stage.
The output buffer stage is also used to compensate the loss of low frequencies that is generally observed at high resonance in 24db/octave filters such as the famous Moog ladder.
Curiously enough, neither Bob Moog nor Alan Richard Pearlman cared to compensate for this loss. This is strange knowing that it is quite a simple modification. Such compensation was introduced by Roland for the  filter of their nowadays very sought after TB303 !

On the two boards I built of this filter I obtained pure sinewave auto-oscillation at high resonance within the range 20Hz-20kHz, for the first board, and within the range 60Hz-20kHz for the second board.

On Demand Info

These kits and assembled modules are offered on demand, click the link to learn more.