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.

There are a wide range of applications for light sensitive switches: lighting, entrance door, automatic staircase, automatic opening of doors to the action of a ray of light, alarm systems, etc… Many ...

BUDGE ING, Maxim Integrated Products Inc., Sunnyvale, Calif. [email protected] Because digital systems often have only a single-polarity power supply, a common problem becomes translating an ...

A comparator is an electronic component that outputs different voltage results at the output by comparing the magnitude of the current or voltage at the two inputs. This article describes the ...

A simple to use window comparator can make short work of integrator, antiwindup, and reset circuits. Control systems that incorporate an integrator stage need some form of integrator reset or ...