BOSSCO OC-2 Octaver User manual

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 > 4558
2SC 732 > 2sc 2240 > 2sc 1815
2SK 30 > 2sk 118
1S 188 > 1n 60
S5500 > 1n 4007
4013 ou 4027
IC1/IC2/IC3/IC7/IC6 buffer, boost and "square up" the incoming signal then divide the
fundamental of the incoming frequenc b 2 and b 4.
IC5b (pins 5/6/7) mixes the incoming signal and the 1/2 frequenc 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 frequenc 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