For this design, the LED flashes on for a brief period and stays off for a relatively longer period. Because additional current is consumed from the battery every time the LED comes on, this long rest period conserves battery power. The brightness of the indicator LED is also limited, again in order to preserve battery power.
Circuit Description
The 555 timer integrated circuit (IC) is configured in an oscillating mode that results in a continuous train of pulses being generated. The frequency determining components have been chosen to give a very slow pulse rate. Two resistors and a capacitor determine the flashing rate of the LED. Power is supplied from a 9-volt battery.
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