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Multivibrator
f-alpha.net » Electronics » Basic Circuits » Multivibrator » Let's go... » Experiment 3 - bistable MV

Experiment 3 - The bistable Multivibrator

Take a look at the circuit shown. The resistors R2 and R5 form the coupling elements.

Circuit of a bistable multivibrator. (Enlarge)

Circuit diagram of a bistable multivibrator.

If you connect the battery, one of the two LEDs lights up. The other LED remains dark. As long as you are not touching the push-button switches, it stays that way. The state is stable.

By pressing the push-button switches R and S you are able to alternately switch the LEDs on and off. The second state is also stable! Hence the term bistable multivibrator.

Flip-Flop

This circuit is also known under the name of Flip-Flop or RS Latch. Here R stands for "RESET" and S for "SET".

But how does the bistable multivibrator works? This you see in the next experiment.

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