Yamaha COD-100 C-MOS Over Drive


  • Out Level
    sets the volume level when the effect is ON. Rotate clockwise to increase level. Compare the effect ON and effect OFF volume levels, and use the OUT LEVEL control to set the desired balance.
  • Over Drive
    sets the intensity of the overdrive distortion sound. Rotate clockwise to increase distortion and sustain.
  • High EQ
    adjusts the tonal quality of the high frequency range. Rotate clockwise to emphasize the high frequencies for a brighter sound.
  • Low EQ
    adjusts the tonal quality of the low frequency range. Rotate clockwise to emphasize the low frequencies for a softer sound.


the manual

The CMOS Over Drive produces the same type of soft, "musical" distortion that is created when a tube amplifier is overdriven.

The input signal first passes through a compressor circuit, and is then fed to a CMOS amplifier, an EQ circuit for tonal variation, and a level control circuit.

The CMOS Over Drive produces a superb overdrive effect without destroying the delicate picking and expressive nuances of the original sound. Further, 2 equalizer circuits are used to maintain exceptional clarity in the high frequency range without producing a hard, "edge" sound. The inclusion of a compressor circuit ahieves long sustain, making this a most versatile overdrive unit.


myFXDB user reviews

1 review, average score of 8.5 / 10

2013-10-07mirosol8.5/10  Glassy MOS-sounds....

Most recent forum threads


  • Input Impedance
    1 MOhm
  • Output Impedance
    less than 2 kOhms
  • Current Consumption
    32 mA
  • Battery Life
    approx. 5 hours continuous
  • Power Source
    9V battery or AC adapter
  • Noise Level
    -96 dB (IHF-A), equiv. input. @ 0dB = 775mV, input shorted, Low EQ, High EQ at center, Over Drive at max.
  • Dimensions
    70 x 61 x 126mm (2-3/4" x 2-3/8" x 4-15/16")
  • Weight
    430g (15 oz) with battery.
  • Tone Control
    Low EQ: 120Hz +/- 8dB, High EQ: 5kHz +/- 8dB
  • Gain Control
    30dB at 1.3 kHz
  • Clip Ratio
    70%, input 0dB, @ 0dB = 775mV, Over Drive at center

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