555 led flasher circuit diagram

An LED flasher circuit can be used as LED blinker, vehicle indicator light, signal flashlight, etc. A simple blinking circuit is basically a circuit to continuously ON and OFF the light supply on a fixed time interval. That is a periodic output of HIGH and LOW state sequences that ON and OFF the LED repeatedly.

led flasher, 555 blinker circuit

Here circuit consists of an astable multivibrator using an NE555 timer IC, which generates a square wave. The circuit has an approximate ON state time of 0.94 Seconds and OFF state time of 0.47 Seconds.

The Rate of flashing of the circuit can be calculated as,

Ton = 0.69*(R1 + R2)*C   |    Toff = 0.69*R2*C

Ttotal = Ton + Toff  = 0.69*(R1 + 2*R2)*C

The flashing rate can be adjusted by varying the values of either resistors R1 or R2 or the capacitor C1. Also, instead of using a fixed resistance value for R1 and R2, either one of the resistance can be replaced with a potentiometer. Then the rate of flash can easily be tuned

components required

IC – NE555

Resistor – R1, R2 – 6.8k, R3 – 1k

Capacitor – C1 – 100uf, C2 – 100nf

LED -Red

Supply – 9v battery

Alternating LED flasher with 555 IC circuit diagram

This alternate LED flasher consists of a pair of LEDs which blink alternately. It has the same circuit of a simple LED flasher circuit using a 555 astable multivibrator. The only difference is that one more LED has added in the circuit, which ON when the 555 output is in a low state.

In the circuit, the LED1 lights when the output pin has a HIGH state and LED2 lights when the output is at a LOW state.

alternate led flasher

The rate of flashing can be adjusted by varying the ON period and OFF period of the astable multivibrator. Refer link of LED flasher circuit.

components required

IC – NE555

Resistor – R1, R2 –  6.8k, R3,R4 – 1k

Capacitor – C1 – 100uf, C2 – 100nf

LED – 2 Nos

Supply – 9v battery

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