Prototype 9.2

This basically Prototype 8 with minor bug fixes, higher amplification gain, an optional power LED, and easier assembly. See its description for more information.

Changes to Prototype 9.1:

• Added PsyLink logo to PCBs
• Added "OFF" and "ON" labels to power switch
• Simplified power LED circuit
• Moved the external power pins (J7) away from the center of the battery, so the pin headers are not physically in the way when removing the battery.
• Better labels on electrode module
• Moved EX1 pin closer to EX5 and EX4 pin closer to EX8, so one can use a 2-pin pin header instead of 2 separate 1-pin pin headers, for faster assembly
• Jumpers to activate built-in electrodes are now closed by default for faster assembly. To disable them, please cut the jumpers carefully with a short knife. To reactivate them, solder them together.
• Larger solder pads on instrumentation amplifier footprint for faster assembly

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• Bill of materials: bom_p9.2.ods
• Components:
• Power Module 4.2
• Electrode Module 3.2
• Circuit 10.2 (electrodes)
• Circuit 12.1 (power)
• AnalogToBLE 1.1 Firmware
• Python Library + GUI
• GNURadio Flowgraph for P10
• Date: 2022-02-10