AM8104 JP04 VCF

Eurorack Module: 14HP wide
User Manual:           AM8104 User Manual

The module uses BA6110 OTA chips in the filter cores and high quality polpropylene filter capacitors. The design includes buffering Op Amps to interface to Eurorack modular levels, and the filter uses an OTA in the resonance feedback loop. 

There are front panel controls for adjusting the Cutoff Frequency and Resonance, as well as the level of 2x control voltages and 2x audio signal inputs. There is a small slide switch to select the keyboard signal into low pass cutoff (OFF, 50%, 100%). Resonance is smooth and controllable into self-oscillation. The keyboard signal is from the pitch CV in the 16-pin Doepfer power connector.

There is a central slide potentiometer with LED that controls the High Pass filter cutoff frequency, which becomes increasingly apparent at the top of the slider range. The AM8104 is hand built with high quality components, including Wima polypropyelne capacitors, Alpha potentiometers, and traditional black phoenic control knobs with spun aluminium inserts.

There are five 3.5 mm jack sockets on the base of the front panel:

• 2x audio inputs
• 2x frequency CV inputs
• 1x audio output