The speed of an automobile can be indicated by detecting the pulses generated by the ignition system and causing an LED to light.
Ever needed a low power 120volt AC power source for your car, van or truck? Well this circuit should do the trick for you.
This alarm circuit is based on two 555 timers. The alarm will sound your car horn if anyone opens the car door while the circuit is armed.
The circuit is drawn for measurement of acceleration from -1000 mg until +1000 mg. It can be placed in kantra’n the car and be supplied from the sheath of electric lighter. The circuit includes one indicative LED and a screen LCD.