Posted on May 20, 2012

A window detector is a specialized comparator circuit designed to detect the presence of a voltage between two prescribed limits; that is, within a voltage window. This circuit is implemented by logically combining the outputs of two single-ended comparators by the IN914 diodes. When the input voltage is between the upper limit, VuL. and the lower limit, VLL, the output voltage is zero; otherwise it equals a logic high level. The output of this circuit can be used to drive a logic gate, LED driver, or relay driver circuit.

Click here to download the full size of the above Circuit.

The circuit shown in Fig. 16-1 shows a 2N2222 npn transistor being driven by the window comparator. When the input voltage to the window comparator is outside the range set by the VuL and I"LL inputs, the output changes to positive, which turns on the transistor and lights the LED indicator.

Leave Comment

characters left:

New Circuits



Popular Circuits

Peak-Reading VU Meters
LED Night Light
Easy intercom 2 wire circuit
Infrared transmitter II
Single injector-tracer
Motor Drivers
ATmega8535 Line Follower Robot circuit diagram
Relay Coil Energy Saver
Infrared remote control relay circuit b