Saturday, November 15, 2014
FLASHER CIRCUIT USING NE 555
Flashing circuits are very interesting. They grab your attention and can be used in many applications. They consume very little energy and a single cell can last as long as 12 months. You can flash globes, LEDs and pulse all types of devices such as motors, solenoids and piezo diaphragms. In this discussion we will cover a number of interesting "oscillator circuits." They can be adapted for other applications - but to do this you have to know how they work. This is not easy as most of them are quite complex. In fact oscillator circuits are one of the most difficult circuits to understand. But if you read the text, everything will become clear.
Circuit Description
This is the circuit diagram of lamp flasher operated from mains. By this you can flash up to 200 Watt lamps at rates determined by you. IC NE555 is wired as an astable multivibrator for producing the pulses for flashing the lamp. The flashing rate can be set by the value of resistors R2 & R3.
Diodes D1 & D2 provides a half wave rectified regulated supply for the IC. Transistor T1 is used to drive triac and triac BT136 for driving the load. Resistor R4 limits the base current of Q1.
Flashing Circuit Diagram & Parts List
Notes
- Assemble the circuit on a good quality PCB or common board.
- Connect a 100K pot instead of R2 if you need frequent changes in rate.
- Many parts of the circuit are live with potential shock hazards. So please be careful.
- As usual use an IC holder for mounting the IC.
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