In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jimbo wrote:

How about this,

You connect a photo resistor to one of the SX pins and you aim it to a night light or a neon light that is common on a lot of surge protectors. If you loose power the night light goes out triggering the resistor. That would give you 100% isolation for your circuit.

Jim W.

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