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.

I-ō47 ʌɪ-əʊ-ˈfɔːti-ˈsɛv(ə)n | noun (signal processingthe in’s and out’s of a classic multimode filter/resonator

Size

14HP
Depth: 27mm

Power

+12V: 50mA
–12V: 50mA

Specifications

  • Centre frequency range 16Hz to 16KHz
  • 1V/octave, Coarse and Fine frequency controls
  • FM input with attenuverter
  • Low pass 12 dB/octave
  • High pass 12 dB/octave
  • Band pass 6 – 12 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)

Sometimes searched for as io47, i-047, i-o47

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