Op Amp

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

• http://4.bp.blogspot.com/-J97VeAMfTS8/VarSHHscsOI/AAAAAAAAI4A/nuwYvkHMt2Y/s1600/1044843_565709233486797_1067282875_n.jpg
• https://mysite.du.edu/~etuttle/electron/circ23.gif

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

Don't work well near the terminals.

• lm324 :
• lm741