This circuit simulates the siren of an American police car.
This circuit simulates the “Red Alert” siren from the TV show Star Trek. It uses two 555 timers in the circuit.
This circuit simulates the siren of a British police car. It uses two 555 timers in the circuit.
I ride my bike allot at night and sometimes I’m not sure if people can see me. This circuit will flash an incandescent light that you can purchase from Radio Shack.
Here is a circuit that uses a 555 timer as the bases of the touch switch.
Sometimes you want a simple solution to a problem and you don’t mind if your main controller has to do the work. This IRPD requires the main robot processor to choose which side to look at, and requires it to “debounce” the results for reliably operation. But, it still works really well without any complex program code.