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Plankton Electronics
The Earwig Rectifying Mixer

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Item: N13-3694

Availability: In stock



The Earwig Rectifying Mixer

The Earwig is a rectifying mixer.

The core of each channel are two half wave rectifiers and one full wave rectifier. There is also gain, pre and post-rectifier bias and an inverter amp. 2 CV bias inputs are provided to modulate the signal. Each channel accepts audio and CV signals.

How It Works

The input signal passes through the first stage of gain and bias. This stage is used to shape and prepare the signal for the next stage, the rectifier. Modulating the bias input is very useful for generating changing patterns after the rectifier. The rectifier has 4 positions: bypass, positive wave inverted, negative wave inverted & full wave inverted. When the positive wave inverted position is selected, only the signal that stays above 0 volts passes through to the output. The result is inverted. At the 3rd position, only the negative signal, everything below 0, passes through. And again it’s inverted. At the last position the positive voltage stays the same, and the negative is inverted, so if we input a sine wave the result is an “m” shaped wave. The result is inverted again.

After this stage there is an inverter switch, so we can keep the signal as it is or invert it one final time.

Finally we have another bias stage. This stage let’s us to move the rectified signal again to the 0 point and modulate it. The channel output is connected here directly.

The mix pots attenuate the signals and mix it between the 2 channels, giving two outputs for both the summing and subtracting the 2 channels.

It’s important to understand that the module is not AC coupled. This means that it works for both audio and CV signals. So when an audio signal is rectified it will be centered in the 0V range.

When connecting a signal to the “BIAS” inputs it is useful to attenuate it previously to avoid saturating the amp. The module does not have attenuators.


  • Two Channel mixer with Gain and Bias control for both channels.
  • Two stages of gain and bias control for each channel for minute control over waveshape and voltage levels.
  • The second stage of gain and bias control contains a Rectifier with four different positions: bypass, positive wave inverted, negative wave inverted, and full wave inverted.
  • A third stage of biasing is the accessable for further fine tuning.
  • Mix attenuators send the final outputs of each channel to a summed output and a subtracted output.
  • CV inputs for the first two Biasing levels.

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  • Dimensions: 19HP, ~1" depth; 26mm.
  • Weight: 0.4 lbs; 178g
  • Power: +12V @ 35mA; -12V @ 35mA
  • Aluminum panel, soft touch knobs.

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