How does a Schmitt trigger work? Part 1: Op-Amp Comparator Explained

Want to understand how a Schmitt trigger works? Before diving into the circuit, you must master the absolute basics: the Op-Amp Comparator. In Part 1, you'll understand how an operational amplifier (op-amp) works in an open-loop configuration.

Summary:
1. Op amp has very large open loop gain. In open loop (which mean no connection between input pins and output), output voltage is equal to difference in voltages multiplied by the large gain.
2. Op amp needs power rails to operate. like +15V and -15V.
3. We can make a comparator by putting required constant reference voltage at negative pin of op amp and giving input at positive pin. Whenever input voltage crosses reference, output toggles to +15V or -15V when input is higher or lower than reference, respectively.
4. For circuits containing active elements, resistors, capacitors, voltage at any node never exceed more than power rail (dc) values.
5. An op amp is a difference amplifier. That's its only job, in any configuration!

For Part 2 (Deriving Thresholds): https://youtu.be/S35fEcfnUFA
For Part 3 (Hysteresis): https://youtu.be/P9lIVnTZSWM

I actually used Schmitt trigger in one of the experiment (Function generator): https://youtu.be/qtDGGP9e1FA

TIMESTAMPS:
0:00 - Op-Amp as difference amplifiers
0:45 - What is a Comparator?
1:19 - Why cant gain be any high?
5:20 - Waveform Example

#OpAmp #SchmittTrigger #Comparator #AnalogCircuits #ElectronicsEngineering #ElectricalEngineering #OperationalAmplifier

Видео How does a Schmitt trigger work? Part 1: Op-Amp Comparator Explained канала Analog Electronics