Telephone Listening Bug

4

Leorick Simon found plans to built a telephone listening bug at Electronics Lab. His resulting project looks quite good. He also took the time to design a nice strip board component layout.

“Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful beginner project.”

Source: Make


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4 Comments


  1. I have built 5 of these transmitters and they work great!



  3. I tried though the dialtone is coming, if we dial the dialtone does not go and the number cannot be dialled and there is no light indication when you pickup the receiver.

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