Boss CS-2 Compression Sustainer pedal schematic diagram
The Boss CS-2 Compression Sustainer effect was sold from December 1981 to June 1986. The pedal compresses high-input level signals while boosting low-input level signals, producing a smooth and long sustain without degrading the quality of the original guitar sound.
Fig. 2: Boss CS-2 Compression Sustainer circuit board - component side
- Controls: Level, Attack, Sustain
- Connectors: Input, Output, AC Adaptor
- Input Impedance: 1MΩ (FET input)
- Output Load Impedance: over 10kΩ
- Compression Range: 38dB
- Maximum Input Level: -10dBm at 1kHz
- Maximum Output Level: -10dBm
- Equivalent Input Noise: -110dBm (IHF-A)
- Recommended AC Adaptor: ACA Series
- Current Draw: 4mA (DC 9V)
- Dimensions: 70(W) x 55(H) x 125(D)mm
- Weight: 400g
ICs, transistors and diodes used in the Boss CS-2 pedal:
- IC1: BA662A (VCA - Voltage Controlled Amplifier IC)
- Q1, Q2, Q3: 2SK30ATM-Y (N-channel JFET transistors)
- Q4, Q5, Q6: 2SC732TM-GR (NPN silicon transistors)
- Q7-Q11: 2SC1815-BL (NPN silicon transistors)
- D1: S5500G (400V/1A rectifier diode)
- D2-D6: 1S2473 (switching diodes)
- D7: RD5.1EB3 (5.1V Zener diode)
- LED: SLP135B (red LED)