Night light

332

03:30:28

A simple night light. Replace the potentiometer with a photoresistor, and adjust the resistors at the comparator for the desired trigger voltage. Aka, the bightness level that the device should turn on, and off. 

Revised: 27k resistors. Pot simulates a photoresistor with with an approximate minimum resistance of 7k and an approximate maximum of 45k. Transistor is a 2N3904 and the opamp is a LT1006. 

published 8 years ago

FernandoCPF

8 years ago

Thanks for the circuit!!! 👍

crake

8 years ago

Glad you like it!

BillyT

8 years ago

Nice circuit. You could get away with 1 transistor as the leds draw less than 100mA.

crake

8 years ago

Yes indeed, BillyT. I realized that earlier today as well. Simplified further!

crake

8 years ago

I just built and tested a similar design with a single LED. It woks quite well.

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