Transmitters: technology, circuit diagrams, possibilities: bugsHere as an exapme of the dangers and possibilities a bug placed into a plugbox (pictures on the right).
It looks like ordinary household stuff, but inside it looks a bit different because of the "additional" content.
Completely opened you can see an FM-transmitter with condenser microphone, mic amplifier, transmitter oscillator and even a RF-amplifier to enlarge the reception area, especially since there are no batteries needed.
Imagine, a neighbour gives you a christmas present like a nice little
lamp for the living room or bedroom....
The technical development is going on and on. Already there are telephone bugs possible,
which dial themselves secretly into the internet to download there the "audio-file of the day"
as a compressed audio-file. So for the spy it´s possible to listen to somebody who lives
quite far away, maybe on the other side of the world.