One Shot Light
Électronique / Electronic
NE5532

We've built many circuits using the dual operational amplifier, but there are many other ways to use this handy IC. The one shot multivibrator is one of them. With this multivibrator, we can make the LED stay on for a preset amount of time when the key is pressed-a one shot light.

Slide the switch to position OFF and build the circuit.

Turn on the power by sliding the switch to position ON.

The LED lights, but quickly turns off. Now press the key and see what happens.

The LED lights and stays on for 2 to 3 seconds and then turns off.

You can change the time the LED is on by using different values for C (100uF + 10UF). Change the value of C from 10μF to 470μF and see what happens to the LED. It stays on much longer.