Neuron / Difference Rectifier

Andrew Fitch's great little Neuron / Difference Rectifier module with Clarke Robinson panel

This refers to the Neuron / Difference Rectifier module with a Clarke Robinson panel

The Difference Rectifier has 4 inputs (two + & two -) and two outputs. The Neuron has two inputs and one output. There is a pad labelled 'ext' where extra inputs can be added if desired (use a 100k resistor attached to the jack).

All inputs for both circuits can be wired to attenuating pots if required. The two pots on the PCB are the critical Offset and Invert controls for the Neuron. The Offset is slightly modded from the previous Double Neuron PCB as it now ranges between +V and -V and its effect is halved by the 200k resistor, giving a greater useful range from the pot.

Schematics and demos - Difference Rectifier and Neuron
http://www.sdiy.org/pinky/data/dif.html
http://www.sdiy.org/pinky/data/neuron.html

http://www.muffwiggler.com/forum/viewtopic.php?t=71433&highlight=neuron+rectifier