Boss OC-2 Octave pedal schematic diagram

The Boss OC-2 Octave pedal produces additional tones, one and two octaves below the original note. The pedal has a direct level control knob for exact tonal shaping and separate controls for octave 1 (OCT 1) and octave 2 (OCT 2).

Schematic diagram of Boss OC-2 Octave pedal
Fig. 1: Boss OC-2 Octave guitar pedal schematic diagram
Boss OC-2 Octave circuit board (component side)
Boss OC-2 Octave guitar pedal

According to, the OC-2 was sold from 1982 to 2003. The pedal was painted originally in a much lighter brown color and it was labeled Octaver. The name changed to Octave in 1984 and the darker shade of metallic brown was introduced about a year later.


  • 3 Controls: Octave 1 Level, Octave 2 Level and Direct Level
  • Connectors: Input, Output, AC Adaptor
  • Residual noise: -100dBm (IHF-A)
  • Maximum input level: -5dBm
  • Maximum output level: 0dBm
  • Input impedance: 1MΩ (FET input)
  • Output load impedance: > 10kΩ
  • Minimum operating input level: -60dBm al 250Hz
  • AC Adaptor: ACA series (black label) or PSA series (silver label)
  • Current Draw: 4mA (DC 9V)
  • Weight: 400g (including battery)

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ICs, transistors and diodes used in the OC-2:

  • IC1-IC5: TL022CP dual operational amplifiers
  • IC6: BA634 (Single T-Type Flip-Flop IC)
  • IC7: uPD4013C (Dual D-Type Flip-Flop IC)
  • Q1, Q3, Q4, Q7, Q8: 2SK30ATM-Y (N-channel JFET transistors)
  • Q2: 2SC732TM-GR (NPN silicon transistor)
  • Q5, Q6: 2SC1815-Y (NPN silicon transistor)
  • D1: S5500G (400V, 1A switching diode)
  • D2: RD5.1EB-3 (500mW 5.1V Zener diode)
  • D3-D9: 1SS133 (switching diodes)
  • D10, D11: 1S-188FM (Germanium diodes)