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Schmitt Trigger
f-alpha.net » Electronics » Basic Circuits » Schmitt Trigger » Let's go... » Experiment 2 - Schmitt Trigger II

Experiment 2 - The Schmitt Trigger Circuit II

Consider the shown simplified diagram. All parts connected to the negative terminal of the battery (0 Volt) are shown in blue, all the components on a positive voltage (>0 Volt) are shown in red.

 

Illustration functioning Schmitt trigger I.

 

When the potentiometer P1 is fully turned clockwise, there is no voltage at the input (Uin = 0 V)...

  • The transistor T1 is turned off and
  • the transistor T2 is turned on, since via the resistors Rc1, R1 and R2 a voltage is applied to its base.

At the output is no voltage (Uout = 0 V). The LED remains dark.

What happens when you increase the input voltage Uin using the potentiometer...?

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