A module combining an analog neuron and a differential rectifier circuit

A DIY module combining a dual analog neuron and a dual differential rectifier circuit

http://nonlinearcircuits.blogspot.com.au/2012/11/neuron-difference-rectifier-pcbs.html

• ? mA +12V
• ? mA -12V
• ? mA 5V

Available as an assembled Module and as a DIY project.

No info about availability.