Electronics > Projects, Designs, and Technical Stuff

Nano current inrush switch/low voltage cutout

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Howardlong:
First thanks for the input on this thread.

Attached is my design which seems to tick the right boxes.

o Behaves throughout the input voltage range (0V - 3.3V), including output always off in low voltage and no negative resistance characteristic.

o Push-pull output

o Low current (80nA at 1V, 94nA at 3.3V)

o ~30mV hysteresis (D3 & D4)

o Switch voltage 1.92-1.95V

The 1N4148 diodes are used in reverse bias mode for their leakage as they're a lot cheaper than ~100Mohm resistors.

You need to be careful when measuring current because the LEDs also act as photodiodes, potentially giving inconsistent measurements.

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