Spy Bug through FM Transmitter

This tutorial shows on how you can make your own spy bug that will transmit audio through a FM transmitter that will require a few parts from an electronic supply store and a fair amount of experience in using a soldering iron on small electronic parts.

It is a two transistor Spy Transmitter that will send the sounds picked up in a room to any FM radio tuned to the same frequency as the transmitter. Resistors, capacitors, and even the wire needed to wind the small coil can also be salvaged from an old circuit board.

The spy phone transmitter consists of two sections, namely, automatic switching section and FM transmitter section. Solder the other end to the negative contact on the 9 volt snap and leave the other end of the wire free to act as the antenna. Apply heat with a heat gun to melt the foam core onto the perf board then insert a 9v battery into the battery snap. With this, it will now send audio to an FM radio for you to listen to once you tune the radio to the channel where the audio is playing.

Rest of project: http://www.lucidscience.com/pro-basic spy transmitter-1.aspx