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Schmitt Trigger
f-alpha.net » Electronics » Basic Circuits » Schmitt Trigger » Let's go... » Experiment 1 - Schmitt Trigger

Experiment 1 - The Schmitt Trigger Circuit

Circuit diagram Schmitt trigger circuit.

 

Schmitt trigger circuit. (Enlarge)

First turn the potentiometer P1 fully clockwise. If you connect the battery, the LED LED1 is off.

On turning P1 counterclockwise, the LED1 will suddenly light up at a certain point.

On turning now the P1 back clockwise, you have to turn a little further before the LED1 goes out again...

The switch-on and switch-off points do not match!

This is the typical behavior of all Schmitt-trigger circuits. To understand the behavior and consequences you need to take a look at the circuit more closely...

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