posted an update

Improved 12VDC to 12VDC Isolator to 5VDC Regulator

New way of delivering voltage to the Arduino, mitigating potential damage - 12VDC-12VDC isolator, followed by a 5VDC Regulator. The isolator will be better than a switcher (non-isolated) to prevent crazy transient currents from destroying the Arduino USB input chip.

12VDC to 12VDC Isolator to 5VDC Regulator

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