Alternating led flasher circuit

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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