Courtesy Lighting with 7555

Posted on Jul 18, 2012

This circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the lamp really switches off. 15 seconds delayed switch-off A good idea for bedroom lamps. Obviously, users will be able to find different applications for this circuit in order to suit their needs.

Courtesy Lighting with 7555
Click here to download the full size of the above Circuit.

Due to the low current drawing, the circuit can be supplied from 230Vac mains without a transformer. Supply voltage is reduced to 10Vdc by means of C1 reactance, a two diode rectifier cell D1 & D2 and Zener diode D3. IC1 is a CMos 555 timer wired as a

Leave Comment

characters left:

New Circuits



Popular Circuits

Auto touch switch
Audio 6 Band Graphic Equaliser Using 741 Op-Amp
volume controller equalizer
Lamp pulser circuit
APH-1050 Power Amplifier
Battery Powered Infrared Remote Control Extender
Gate automatic lamp circuit