BUG DETECTOR


Posted on Feb 4, 2014

This rf detector can locate low-power transmitters (bugs) that are hidden from sight. It can sense the presence of a 1-mW transmitter at 20 feet, which is sensitive enough to detect the tiniest bug. As you bring the rf detector closer to the bug, more and more segments of its LED bar-graph display light, which aids in direction finding. The front


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

end has a two-stage wideband rf amplifier, and a forward-biased hot-carrier diode for a detector. After detection, the signal is filtered and fed to IC1, an LM3915N bar-graph driver having a logarithmic output. Each successive LED segment represents a 3-dB step.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Ultra Low Power LCD Indicator
USB Development Board
Transmission indicator
Charging the Earth
arduino Electret Microphone preamplification will it work for dynamic type microphone
Decimal Counter Using Two 7-segment displays and an 8051
two transistor radio
Bicycle back Safety Lights
Crystal Locked FM Bug
HV REGULATOR WITH FOLDBACK CURRENT LIMIT
556 photoelectron pulse detectors omission



Top