Once upon a time, in one of the magazines “Radioamator” or “Radiohobby”, I don’t remember any more, I came across a high-frequency radiation detector circuit. So I decided to repeat it in DipTrace and draw a printed circuit board. I will return home and collect. Below is a link to the archive with DipTrace files, someone might want to repeat. From the description I remember that it catches the radiation of the mobile at a distance of up to three meters. 5 W radio transmitter – up to ten meters. In general, experiments will show. Diodes 1D507 – high-frequency germanium. It is adjusted by the variable resistor R2 until the LED 2 goes out. The voltage at the output of the U1 microcircuit should be + 7.2V.

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