Figure 3 The buffer amplifier provides infinite input impedance and zero output impedance. Another common op-amp circuit is the inverting amplifier (Figure 4). As the name implies, the output voltage ...

This Circuit can compare the Light level in an area. It uses a PN Photodiode as the light sensor and IC CA3140 as voltage comparator. The circuit is ideal as the front end of burglar alarm circuits.

By adding selected feedback and input components, you can make the op amp perform an incredible number of basic circuit functions. 1. Shown is the standard op-amp schematic symbol. Op amps are ...