This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1.
Automatic blinker comprises two modules. First is the dark detector circuit and the other is a multivibrator configured in astable mode of operation. When there is enough darkness on LDR, 555 gets power from the emitter of transistor Q2 and LED D1 starts blinking.
Automatic Dark Sensor Circuit
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