I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic 1047 module of the ARP2500. It has been designed with some extra features and quirks built in.

The internal VCA’s are a new hybrid design of matched transistors and precision op-amps.

With CV controllable centre frequency, resonance/Q and notch offset along side FM, strike and a complex dual input with wave shaping limiter, the I-ō47 is truly a filter for all occasions.

Features:

• Centre frequency range 16Hz to 16KHz
• 1V/octave, Coarse and Fine frequency controls
• FM input with attenuverter
• Low pass 18 dB/octave
• High pass 18 dB/octave
• Band pass ~6 – 18 dB/octave dependent on Q
• Notch with variable offset –/+ 2 octaves
• Input with gain control
• Inverted input with resonance dependent gain
• Strike input for pinging the filter
• Feedback switch which adds BP to the input for enhances resonance
• Limiter based on tanh wave shaper which affects primary input (post gain fader)

Specifications:

14HP
Depth: 27mm

+12V: 50mA
–12V: 50mA

Note: This is a used item, and while it is guaranteed to be fully functional it is almost sure to also contain "rack rash" on the mounting holes and have some minor scratches on the panel from use. It will include a ribbon cable, m3 screws, and a box, but not the original box.