1U 6HP Difference Rectifier

Those that build a lot of NLC modules will know this is one of my favorite circuits. The diff-rect has appeared on the Neuron, 1050 mix/sequencer, triple Sloth, GENiE and 8 of them make up the Let's Splosh.
It is great for mixing audio and/or CV signals to get all kinds of unexpected and interesting results. This page from 2012 on my old Pinky site has some more details.

The panels are available in Pulp and Intellijel formats and in white/gold or black/gold, please specify when ordering.
  Please note, the PCBs only have eurorack 10 pin power connectors, not the Pulp Logic 3 pin type.

PCB & panel set = USD10
assembled = USD55

Build guide on wiki