Night service lamp

200

02:34:51

The 200k resistor is a photoresistor. So it has a low resistance with light and a hight resistance in the darkness. When we shut down the light the resistance increase and also the voltage drop so it sets high the out pin of a comparator that throught a transistor gives power to a monostable 555 that turns on the Leds giving us time

published 11 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.