555+Astable+Timer+Circuit

**How it works!!!!**

The capacitor charges through the timing resistors, (10K and 1K) until its voltage reaches two-thirds of the voltage of the battery. At this point the voltage from Pin3 changes from HIGH to 0V. As a consequence of this the capacitor starts to discharge through the 10K resistor and through Pin7 of the 555 IC until the voltage of the capacitor is less than one-third of the battery voltage. When this happens the output from Pin3 changes back from 0V to HIGH voltage. This process is constantly repeated until the circuit is switched off.