The CGS Serge panel had room for one small module, so I added this little mixer.   The simple design provides two attenuated inputs, plus a bias offset pot with a switch, with normal and inverted outputs.  It’s the only non-Serge circuit in the panel.

It is made from a CGS 23 Mixer PC board, salvaged from an overhaul of my Mixer-Comparator module.  The comparator IC is left out.  The design goal of avoiding wires soldered between the boards and front panel was met by installing MTA-100 connectors.   This board also serves as a power input filter for the DUSG board, since that board lacks a standard MOTM power header.

Here’s the wiring.