@▷ Courtesy Light Circuit | Diagram for Schematic

Courtesy Light Circuit


Warning! The circuit is connected to 220Vac mains, then some parts in the circuit board are subjected to lethal potential!. Avoid touching the circuit when plugged and enclose it in a plastic box.

15 seconds delayed switch-off
A good idea for bedroom lamps

Circuit diagram

Parts:
R1 470R 1/2W Resistor
R2 100K 1/4W Resistor
R3 1M5 1/4W Resistor
R4 1K 1/4W Resistor
C1 330nF 400V Polyester Capacitor
C2 100µF 25V Electrolytic Capacitor
C3,C5 10nF 63V Polyester or Ceramic Capacitors
C4 10µF 25V Electrolytic Capacitor
D1,D2 1N4007 1000V 1A Diodes
D3 BZX79C10 10V 500mW Zener Diode
D4 TIC206M 600V 4A TRIAC
Q1 BC557 45V 100mA PNP Transistor
IC1 7555 or TS555CN CMos Timer IC
SW1 SPST Mains suited Switch

Device purpose:
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.
Obviously, users will be able to find different applications for this circuit in order to suit their needs.

Circuit operation:
Due to the low current drawing, the circuit can be supplied from 220Vac mains without a transformer. Supply voltage is reduced to 10Vdc by means of C1 reactance, a two diode rectifier cell D1

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