Electronics > Projects, Designs, and Technical Stuff
Nano current inrush switch/low voltage cutout
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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