Power Module 1

Purpose

This implements the power supply module from Circuit 6 (whole device) and powers Prototype 4, where it also provides a reference voltage for Electrode Module 1.

Notes

• There are actually two CR2032 coin cells in the battery slot
• There's an optional second green pin for the ground electrode
• One small single-output opamp would suffice, but all I had at the time was this LM324 quad opamp.
• Need to move this to a SMD PCB in the long run, this is still too bulky. It's about the dimensions of a 9V battery.
• Dimensions: 36 x 30mm

Output pins

• Black: Ground
• Red: V+ = ~6V
• Green: Vref = V+/2 = ~3V (reference signal)

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• See blog post Power Supply Module
• Used in prototype:
• Prototype 4
• Circuit: Circuit 6 (whole device)
• Date: 2021-05-09