Telephone Listening Bug

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 Responses to “Telephone Listening Bug”

1. Trax Says:
   May 1st, 2006

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

2. Poster's Name Says:
   November 16th, 2006

   Has anyone heard of this before?

3. bala Says:
   November 7th, 2009

   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.

4. DIY Laser Listening Device | E-Bigg News Says:
   September 29th, 2010

   [...] the building across the street? If the conversation is happening over the phone you could build a DIY Telephone Listening Bug and tune into the conversation on a radio but what if the conversation is  happening between two [...]

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