Spotting hidden RF bugs

Here's a design idea that showcases a circuit that detects RF "bugs," such as hidden wireless cameras, eavesdropping microphones, and other spying devices that emit RF frequencies in the 100MHz to 3000MHz range. A modification to this circuit not only detects RF bugs, but also locates their hidden positions. This design uses a log detector (MAX2015) that senses RF signals at pin INHI, and produces an output voltage on pin 8 proportional to the power level of the received signal.

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Originally published by Maxim Integrated Products at www.maxim-ic.com as "Circuit Detects and Locates Hidden RF Bugs".