Dark-activated 230V Lamp


Posted on Oct 15, 2012

This device allows one or more lamps to illuminate at sunset and turn off at dawn. Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1.


Dark-activated 230V Lamp
Click here to download the full size of the above Circuit.

When the light hits R1, the photo resistor assumes a very low resistance value, almost shorting C1 and preventing circuit operation. When R1 is in the dark, its resistance value becomes very high thus enabling circuit operation.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

5V regulated power supply
Valve high-gain stereo preamp
Ultraviolet light source UV-80 for PCB exposure
Turning analog inputs into multi-switch digital inputs
spider prog content
Dash Instrument Testing
jk electrical lighting sound systems
Regency TR-1 Transistor Radio
UNIVERSAL BATTERY CHARGER
LED Flasher



Top