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This is
basically a flasher circuit modified to turn on and off a bulb
instead of a LED. It uses a 555 timer IC working as an astable
multivibrator. The flashing rate can be varied from very fast to a
maximum of once in 1.5 sec by varying the preset VR1.
The ON time of the circuit is given by:
TON= 0.69xC1x(R1 + VR1) second
and the OFF time is:
TOFF= 0.69xC1xVR1 second
You can increase the value of C1 to 100uF to get a slower flashing
rate of upto once in 10 sec.
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