Boss TR-2 Tremolo pedal schematic
The Boss TR-2 Tremolo pedal generates the classic tremolo effect, periodically changing the volume of the sound. The 3 control knobs provide a multitude of effect possibilities: the Depth control determines the strength of the effect, the Rate knob controls the speed and the Wave pot alters the LFO waveform from triangle to square.
Fig. 1: Boss TR-2 Tremolo guitar pedal schematic diagram
Fig. 2: TR-2 Tremolo PCB - component side
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Specifications:
- 3 Control Knobs: Rate, Wave, Depth
- Connectors: Input, Output, AC Adaptor
- Input Impedance: 1MΩ (FET input)
- Nominal Input Level: -20dBu
- Nominal Output Level: -20dBu
- Residual Noise Level: -90dBu
- Recommended AC Adaptor: PSA Series
- Current Draw: 20mA (DC 9V)
- Weight: 400g
- Dimensions(mm): 73(W) x 59(H) x 129(D)
- Dimensions(inches): 2-7/8(W) x 2-3/8(H) x 5-1/8(D)
ICs, transistors and diodes used in the TR-2 Tremolo pedal:
- IC1: M5207L01 (Dual VCA - Voltage controlled amplifier IC with linear control)
- IC2,IC3,IC4: M5218AL (Dual low-noise operational amplifiers)
- Q1, Q3: 2SK118Y (N-Channel JFET)
- Q2, Q5, Q7: 2SC2458GR (NPN silicon transistors)
- Q4: 2SK184GR (N-Channel JFET)
- Q6: 2SA1048GR (PNP silicon transistor)
- D1, D4: 1N4004 (400V/1A rectifier diode)
- D2, D3: 1SS133 (switching diodes)
- D5: MTZ5.6B (5.6V Zener diode)
- D6: LN-28RP (red LED)