Knead

CP3 Type Analog Transistor Mixer with EQ and MUTE

This module has been discontinued. The successor module is μSUM.

The mixer is especially designed to knead single audio waveforms, but will of course also handle more complex audio sources. It was inspired by the famous MOOG CP3-Type Mixer. The circuit adds some nice harmonic distortion to the signal with heavy clipping, if the inputs are turned to the maximum. As the mix is bussed passively turning one input up may result in a reduction of the other inputs. Therefore the output cannot exceed any other input´s level providing auto-leveling on high volumes.
There are three potentiometers to adjust the LEVEL for each signal. Additionally you may change the frequencies of each channel by turning the EQ knobs. EQ will bost high frequencies turning the knob clockwise and boost low frequencies turning it counter-clockwise. On top you will find MUTE switches for easy sound comparison or live mixing. LEDs will indicate if a signal is passed through. The LED´s brightness can be set with trim potentiometers for each channel. The MIX VOL knob controls the volume of the summed signal being supplied at the OUT Jack.

Knead Expander is an optional 2HP add-on module providing a wider range of functionality without using an additional power socket. In order to use LEVEL, EQ and MUTE individually just connect the Knead Expander to the main module with a ribbon cable. This gives you additional three illuminated single outs in order to patch a single channel to your audio patch without being summed with the other signals.
As channel three is connected to the other two channels via a JFET Amplifier, it can be used for amplitude modulation. This way you will get a very simple Waveshaper, VCA or Ringmodulator.

Details:

Transistor based Analog Mixer
3x Audio channel
3x EQ
3x Mute Switch
3x Signal LEDs
LED brightness can be adjusted for each channel
MIX Volume
Skiff friendly
Wrong polarity protection

The main module consist of two boards:

Front PCB Panel
Main PCB with all electronic components

Don´t forget to check out the Knead Expander!

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