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Anything related to Schmitt trigger circuits. Schmitt triggers are positive feedback comparator circuits exhibiting hysteresis.

3 votes

Schmitt trigger with three transistors

it is most simple to understand by first looking at a simpler Schmitt trigger circuit, luckily it is there in the image, this is what you have there is just an enhanced version for more hysteresis. so …
TeD van Loon's user avatar