A small and simple voltage adder.

nupsi simply adds two voltages, positive or negative. This could be control voltages (CV) like for instance adding a static offset from a voltage source to an 1 volt per octave CV signal. It is build of a TL072 OpAmp, so it’s fast enough to use nupsi as a simple audio mixer by just plugging in two audio signals.
But it’s main feature is it’s small format, because it fits exactly in this annoying 4HP gap in my 1U row for which no useful modules seem to exist. Coincidence? I think not!

https://kleinerdrei.net/2021/05/26/nupsi-ading-voltages-in-1U-4HP.html