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Wednesday, November 04, 2009

Delayed switch for Bedroom lamp


Here I have introduce a new circuit through this you can switch off your bed room lamp with some delay.so I suppose this may be so useful circuit for you.and also after attaching a relay for this circuit you can use this as a delay circuit.This gives 15 second delay




Parts:

C1 330nF 400V Polyester Capacitor

C2 100µF 25V Electrolytic Capacitor

C3,C5 10nF 63V Polyester or Ceramic Capacitors

C4 10µF 25V Electrolytic Capacitor

R1 470R 1/2W Resistor

R2 100K 1/4W Resistor

R3 1M5 1/4W Resistor

R4 1K 1/4W Resistor

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

Note

# The delay time can be changed, changing R3 and/or C4 values.
Taking C4=10µF, R3 increases timing with approx. 100K per second ratio. I.e. R3=1M Time=10 seconds, R3=1M8 Time=18 seconds. Do test and see it.

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