The OD-2 was manufactured as a replacement for the OD-1 in the mid-1980s and uses only discrete components. It has 3 potentiometers for level, drive, tone control and a switch for selecting two modes of operation. When set to the OFF position the sound is similar to the OD-1 but in the turbo mode it generates more gain and distortion.
Fig. 1: Boss OD-2 Turbo OverDrive guitar pedal schematic diagram
Fig. 2: Boss OD-2 Turbo OverDrive circuit board - component side and foil side
Controls: Level, Tone, Drive, 2-way Mode switch
Connectors: Input, Output, AC Adaptor
Input Impedance: 1Mohm
Output Load Impedance: 10kohm or more
Equivalent Input Noise: -118dBm or less (IHF-A, Tone center, Input Short)
Recommended AC Adaptor: ACA Series
Current Draw: 10mA @ 9V
Dimensions: 70(W) x 55(H) x 125(D)mm
Weight: 410g (14 oz.)
Transistors and diodes used in the OD-2 Turbo OverDrive: