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

temperature stable oscillator
125Watt 150Mhz amplifier
stepper motor control
rs232 to rs485 circuit
Nokia 7610 MMC Corrupt Problem Picture Help
umbrella
Loud ringer for phone using KA2411
Atmel 89C2051 prototype board
Continuity or just plain connect
DC bridge amplifier circuit



Top