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

FM Transmitter (2N2222)
Electronic light flasher
Burglar-alarm
mini and simple power amplifier
ADUC841 20MIPS 8052 Flash MCU + 8-Ch 12-Bit ADC + Dual 12-Bit DAC
Field Strength Meter
Low Cost Battery Condition Indicator
Bedini Self Oscillator High Voltage Output
ultrasonic transmitter
tunnel diode circuits
Improved Anode Circuit Parasitic Suppression for Modern Tubes
A control circuit diagram 555 pairs steady mode



Top