Op Amp

https://en.wikipedia.org/wiki/Operational_amplifier_applications

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Comparator

Simplest op amp circuit

Non-Inverting amplifier

Amplifies the input voltage. Cannot go below unity.

For high power, output can go through a transistor.

Schmitt Trigger

Uses positive feedback.

Current Sensor

I had to do the math analysis to understand this. Configuration is a differential amplifier.

Real Op Amps

I need to test the op amps I have and see how close to the rails they actually get.

I also need to build a real circuit that uses an op amp to drive a transistor from on, through active to off.