This is a circuit for generate the pulse of timer circuit. This circuit is used to ring my doorbell rapidly three times when a car pulled into my driveway. This circuit is based on 555 timer IC. This is the figure of the circuit.
R2 and C2 set the output frequency. Use a diode and resistor to change the duty cycle, if desired. R1 and C1 set the cycle time which sets the number of pulses. R3 can be deleted if you have other loads on the power supply. The circuit is activated by applying power to it. The first pulse will be longer than the others.
R2 and C2 set the output frequency. Use a diode and resistor to change the duty cycle, if desired. R1 and C1 set the cycle time which sets the number of pulses. R3 can be deleted if you have other loads on the power supply. The circuit is activated by applying power to it. The first pulse will be longer than the others.
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