Bug-listening bug
I urgently needed to assemble a listening device with my own hands. I started to google wool. There were quite interesting things, from the synopsis of the series "Invisible" to "one hundred ways to hack a VKontakte account."
It was not so easy to solve my problem, although one original recipe was found. On the site of radio amateurs, I found a transmitter circuit with a decent range - up to 300 m. However, in order to adjust this circuit, some experience is needed.
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Details:
VT1 - any type of transistor KT315 (KT3102). Pick up depending on the required sensitivity of the microphone.
VT2, VT3 - KT368 (Gain - at least 100). It is advisable to use in a metal case.
M1 - microphone type "pine", FEM-3, or some import.
L1 - 3 turns with 0.5 mm wire on a 5 mm frame.
L2 - 2 turns with 0.5 mm wire on a 5 mm frame.
L3 - 8 turns of wire 0.25 mm on the frame 5 mm.
After assembly, it is desirable to place the entire circuit in a metal case.
Having sweated over the “bug”, I nevertheless achieved my goal and learned many, many interesting things. But that's another story.
It was not so easy to solve my problem, although one original recipe was found. On the site of radio amateurs, I found a transmitter circuit with a decent range - up to 300 m. However, in order to adjust this circuit, some experience is needed.
')
Details:
VT1 - any type of transistor KT315 (KT3102). Pick up depending on the required sensitivity of the microphone.
VT2, VT3 - KT368 (Gain - at least 100). It is advisable to use in a metal case.
M1 - microphone type "pine", FEM-3, or some import.
L1 - 3 turns with 0.5 mm wire on a 5 mm frame.
L2 - 2 turns with 0.5 mm wire on a 5 mm frame.
L3 - 8 turns of wire 0.25 mm on the frame 5 mm.
After assembly, it is desirable to place the entire circuit in a metal case.
Having sweated over the “bug”, I nevertheless achieved my goal and learned many, many interesting things. But that's another story.
Source: https://habr.com/ru/post/90141/
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