Uhf Motion Detector


Posted on Oct 12, 2012

The UHF motion detector operates on the Doppler radar principle. Ql is an oscillator that creates a radiated signal. An


Uhf Motion Detector
Click here to download the full size of the above Circuit.

object in the radiated field reflects some of this energy back to the detector. If the object is moving, the reflected signal will have a different frequency because of Doppler shift. Ql is an oscillator coupled to a small (8-cm) antenna. This antenna also receives the reflected signal. Dl acts as a mixer and produces a beat note of frequency that is equal to the difference in reflected and radiated signal. Q2 amplifies this signal and couples it to comparator/detector IC1A and IC1B. The output can continue on to an alarm, relay, lamp, etc.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mini Oscilloscope schematic
Ultra-high gain audio amplifier
Long-range-object-detector
Digital voltmeter using ICL7107
18v power supply using lm7818
edm production circuit
LM741 Light Dark Sensor
2Digit up/down Counter



Top