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.

Schematic diagram of Boss TR-2 Tremolo pedal
Fig. 1: Boss TR-2 Tremolo guitar pedal schematic diagram
Boss TR-2 Tremolo pedal board - component side
Fig. 2: TR-2 Tremolo PCB - component side
Boss TR-2 Tremolo pedal picture


  • 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)