The Hampshire Electronics Dual VCF is a 100% analogue voltage-controlled filter in the popular Eurorack format.
The VCF features two completely independent filters, a high pass (6db) and low pass (12db).
These filters can be used completely independently or chained to produce highly controllable band-pass and notch filters, with controllable Q and filter cut-off.
The filters are of the state-variable style, inspired by the classic filters on the MS-20 synth of the late 1970s. This filter style is rightly regarded as a classic.
The LP filter section self-oscillates at high resonance settings and, due to its high performing matching transistor pairs, can also be used as a sine-wave voltage-controlled oscillator (VCO).
The key details of the VCF are:
20HP Wide Eurorack module with thin profile (20mm deep from faceplate)
Controls designed and laid-out with performance in mind
100% analogue circuitry
Tough yet light composite faceplate
Provides independent LP and HP filters and combined BP and Notch filters
Uses two highly log-conformant LS-358 matched transistor pairs for accurate key tracking
The HP section self-oscillates, enabling usage as a sine-wave VCO
Filter cut-off CV inputs for both HP and LP filters with attenuator pots
Tracking CV inputs for both HP and LP filters with 1v/Oct tracking
Internal routing of LP filter output to HP filter input
