Experiment 20 - The gated astable Multivibrator using the Timer NE555

Using the NE555 timer you are able to build a gated astable multivibrator.

Build the circuit shown.

Circuit of a gated astable multivibrator with timer 555. (Enlarge)

Circuit diagram of a gated astable multivibrator with timer 555.

Only if you press the pushbutton switch S1, the LED flashes. Releasing the pushbutton switch and the LED goes dark.

The NE555 timer is very versatile. Therefore, further applications and the internal functioning are discussed in the separate topic "Timer".