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f-alpha.net » Electronics » Basic Circuits » Multivibrator » Let's go... » Experiment 1 - Transistor as Switch

Experiment 1 - The Transistor as a Switch

First, do you pose yourself the question of what an "electronic switch" or "digital circuit" is.

Circuit of a saturated transistor. (Enlarge)

Circuit diagram of a saturated transistor circuit.

In the circuit shown, you recognize a transistor circuit. The transistor is connected such that it acts as an electronic switch...

  • If the push-button switch S1 is open, the transistor is locked and the light emitting diode LED1 is dark.
  • If you close the push-button switch S1, the transistor is "saturated" and switches through completely. The LED lights up.

The circuit has two states! Therefore, it is also called a digital circuit.

In the next experiment, you couple two digital circuits...

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