The rate of flashing can be adjusted by varying the ON period and OFF period of the astable multivibrator. In the circuit, LED1 lights when the output pin has a LOW state, and LED2 lights when the output is in a HIGH state. The only difference is that one more LED is added in the circuit, which ON when the 555 output is in a low state. It has the same circuit as a simple LED flasher circuit using a 555 astable multivibrator. This alternate LED flasher consists of a pair of LEDs that blink alternately. ![]() Supply – 9v battery Alternating LED Flasher With 555 IC Circuit Diagram Then the rate of flash can easily be tuned Also, instead of using a fixed resistance value for R1 and R2, either one of the resistance can be replaced with a potentiometer. The flashing rate can be adjusted by varying the values of either resistors R1 or R2 or the capacitor C1. The Rate of flashing of the circuit can be calculated as, 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. ![]() ![]() That is a periodic output of HIGH and LOW state sequences that ON and OFF the LED repeatedly. A simple blinking circuit is basically a circuit to continuously ON and OFF the light supply on a fixed time interval. An LED flasher circuit can be used as an LED blinker, vehicle indicator light, signal flashlight, etc.
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