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Light Flasher -Naveen
P N Click here for the circuit diagram
This is a very basic circuit for
flashing one or more LEDS and also to alternately flash one or more LEDs.
It uses a 555 timer setup as an astable multivibrator with a variable frequency.
With the preset at its max. the flashing rate of the LED is about 1/2 a second.
It can be increased by increasing the value of the capacitor from 10uF to a
higher value. For example if it is increased to 22uF the flashing rate becomes
There is also provision to convert
it into an alternating flasher. You just have to connect a LED and a 330ohm
as shown in Fig.2 to the points X and Y of Fig.1. Then both the LEDs flash alternately.
Since the 555 can supply or sink
in upto 200mA of current, you can connect upto about 18 LEDS in parallel both
for the flasher and alternating flasher (that makes a total of 36 LEDs for alternating
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