In this circuit, a 555 timer IC is connected in astable mode to flash an LED on and off. The output from the 555 is a continuous pulse waveform. The output frequency is determined by the 1K resistor that connects pin 8 and 7), the 470 K resistor and the 1 microfarad capacitor. The timing capacitor charges through 1K and 470K resistors but only discharges through the 470K resistor. The rate of flashing can be slowed down easily by using a higher value resistor (i.e. 1M resistor).
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