2:1 mixer, version 2


Overview

My original mixer had a couple of shortcomings -- non unity gain, the need for matched source impedances, and unnecessary (for my purposes) level controls. So I decided to build a new, better mixer.

Design

Schematic

thumbs/mixer_v2_schematic_thumb.jpg

This is a classic mixer circuit with inverting input stages and an inverting summing stage.

Building it

From left: Case drilled with phono and DC jacks mounted, circuit built on perfboard, completed mixer.

thumbs/mixer_v2_003_thumb.jpg thumbs/mixer_v2_005_thumb.jpg thumbs/mixer_v2_008_thumb.jpg

Note that I left out the LED (and R9) because I didn't feel it was necessary.


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e-mail: jason@jasonwolley.com