Below is a typical 555 astable circuit that drives an LED. It is known as a LED flasher as the LED flashes on and off. The number of flashes per minute can be altered by turning the variable resistor.
Remember the 555 is activated by current at pin two and the output is through pin three. Altering the variable resistor alters the time between ‘pulses’ at pin three. The pulse at pin three switches the transistor which allows the LED to come on.
The LED flashes on and off because with this astable circuit the pulses from pin three are repeated until the power is switched off completely.
The LED flashes on and off because with this astable circuit the pulses from pin three are repeated until the power is switched off completely.
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