Alternate light flasher circuit – Dual LED
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.
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.
IC – NE555
Resistor – R1, R2 – 6.8k, R3,R4 – 1k
Capacitor – C1 – 100uf, C2 – 100nf
LED – 2 Nos
Supply – 9v battery