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Rf Sniffer Circuit

2017-08-15 08:05  
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This circuit responds to RF signals from below the standard broadcast band to well over 500 MHz, and provides a visual and audible indication when a signal is received. The circuit is designed to receive low-powered signals as well as strong sources of energy by adjusting the bias on the pick-up diode, Dl, with R2.A very sensitive setting can be obtained by carefully adjusting R2 until the  LED  just begins to light and a faint sound is produced by the Piezo sounder.

Rf sniffer