Small mixer, DC coupled

Motivation

Mixer front view.

It is mostly sufficient to mix only two or three audio or control voltages together to enhance your sound or the sound animation. So this small mixer comes in handy for mixing CV sources and audio sources as well. This version is DC coupled, so you can use it for AC and DC mixing. There is an inverted output added. You can reverse the DC-CV mix with it or experiment with feedback loops in the audio domain.




Specs and features


Implementation

Schematic

Small mixer schematic control board

Small mixer schematic: Control board

Small mixer schematic level indicator board

Small mixer schematic: Main board board

Description:

Control board: Straight forward design. The mixer is completely DC coupled. So you can use it for CV mixing as well as audio mixing. IC1B, C, D buffers the input signal. With this buffer and the 1Meg resistors at the input the input resistance is held constant.

Main board: IC1D sums the three inputs and inverts the signal. IC1B corrects the phase. IC1C and IC1A are the output buffers.


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Calibration

  • None
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Building hints

  • None

Special parts

  • None

Download

Small mixer control board documentation download
Small mixer control board Gerber files download
Small mixer main board documentation download
Small mixer main board Gerber files download
Small mixer *.fpd file download

Small mixer front view

Small mixer: Front view


Small mixer populated control PCB

Small mixer: Populated control PCB


Small mixer populated main PCB

Small mixer: Populated main PCB


Small mixer side view

Small mixer: Side view


Small mixer back view

Small mixer: Back view


2021 April V 0.9.0-F

2021 April V 0.9.0-B

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