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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This is 12V Fluorescent lamp circuit.This is useful circuit for vehicle owners.Because they can use this circuit for their car or van.When you check this circuit be careful because this releases about 350V.

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8 Watt Flouroscent Lamp Driver Circuit

This is a design circuit of a simple flouroscent lamp driver circuit based on two transistors. The circuit uses capacitive ballasting for driving the tube. An 8 Watt standard flouroscent tube can be efficiently driven using the circuit.

The two transistors (2SC1983) with associated components form an oscillator around 1KHz. The oscillator is wired so that saturation conditions of the transistors are prohibited. This adds on to the efficiency of the circuit. The circuit produces a clean sine wave with very less noise. The winding details (no of turns) are given in the circuit. Use 0, 8 mm diameter enameled copper wire for primary and 0, 4 mm diameter enameled copper wire for secondary. The core can be a ferrite core. The primary should be wound first and secondary on top of it. The circuit is use a 12 V battery or 12 V DC power supply as the DC voltage source.

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