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Multiple Pulse Generator
All materials and content contained on this page are the exclusive intellectual property of Andrew R. Morris and
may not be copied, reproduced, distributed or displayed without his express written permission.

I used this circuit to ring my doorbell rapidly three times when a car pulled into my driveway.  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 with be longer than the others.

More:  Doorbell CircuitsPulse GeneratorsTimer
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