3 ms·
I have a couple LED night lights that are triggered by a photocell to only turn on in the dark. I've often wondered if the trigger circuit consumed more power t
by WalterBright 2y ago
I have a couple LED night lights that are triggered by a photocell to only turn on in the dark. I've often wondered if the trigger circuit consumed more power than just leaving the LED on.
- nine_k 2y agoIt likely consumes next to no power: a proper switching MOSFET has negligible resistance when open, and has a very high gate resistance, so the photo cell does not have to produce any significant current. Possibly the current-limiting resistor in the power supply of the LED circuit dissipates more than the trigger circuit.