WORKING:
The circuit operation was completely based on the astable mode operation of IC 555 and current sinking capability of the IC 555.As you can see that IC 555 was wired as an Astable Multivibrator operation making it to produce a series of square wave pulses.The duration of the pulses of the output was obtained by means R3,C1 and variable resistor VR1.The variation in these three values influence the timing output of the IC 555.
The square wave output from the pin 3 was used as a source for Led 2 and Sink for Led1 thus making to perform switch operation.Whenever the output from the pin 3 was high the Led1 obtain source current from the IC and switches on.When the pulse was high the Led 1 will not be grounded and hence it remains in off state.When the output pulse goes low the Led1 will be grounded to the Pin 3 of the IC 555.Since IC 555 can sink currents upto 200 mA the Led1 will be switched on for the duration of low pulse output from the IC 555.The resistors should should be avoided in order to prevent the damage of the LED's.Thus the Alternate switching of the LED's give a beautiful effect see more LED circuits here.Any component rated less than 200 mA can be used in this circuit instead of LED.Try this circuit and post in your views and comments on this circuit.
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