Vintage 1982 BOSS OC-2 OCTAVE oc2 octave pedal MIJ JAPAN

Boss OC-2 Octave guitar pedal schematic diagram

The pedal has a direct level control knob for exact tonal shaping and separate controls for octave 1 (OCT1) and octave 2 (OCT 2).

Specifications: • 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)

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)

TL 022 > 45582SC 732 > 2sc 2240 > 2sc 18152SK 30 > 2sk 1181S 188 > 1n 60S5500 > 1n 40074013 ou 4027

IC1/IC2/IC3/IC7/IC6 buffer, boost and "square up" the incoming signal then divide the fundamental of the incoming frequency by 2 and by 4.

IC5b (pins 5/6/7) mixes the incoming signal and the 1/2 frequency square wave from the flip-flops. This signal is then fed to IC4b (pins 5/6/7) which is a low pass filter/buffer. IC4b cleans up the signal and feeds it out through VR1 as OCT1.

IC5a (pins 1/2/3) mixes the signal coming out of OCT1 and the 1/4 frequency square wave from the flip-flops. This signal is then fed to IC4a (pins 1/2/3) which is a low pass filter/buffer. IC4a cleans up the signal and feeds it out through VR2 as OCT2.

TL072, LF353P, NE3552 and the RC4558