For those who want to give audio surveillance a try and, despite not having the necessary resources to purchase a complete set of bugging devices and hidden microphones for secret listening, are equipped with a good deal of patience as well as some basic knowledge of electronics, today on the Internet it is very easy to find instructions to build your own equipment that can perform the same job at a fraction of the cost.
For example, on one of the many specialized sites, you can find detailed instructions to concoct your own spy bug, with simple off-the-shelf pieces that can easily be obtained by recycling an old radio.
Obviously the result will not be something that can be used by a surveillance professional for performance at the highest level, but it can be more than enough, for example, to listen to your neighbors or your children while they are playing in their room.
The intelligence you gather can be easily listened to with a standard FM radio, so maybe if you’re going to pull a prank on your neighbors, make sure that they do not have their radio on, or they may end up listening to themselves in real time!
Detailed instructions for building this device, that must be considered nothing more than a toy, are quite simple for those who have a basic understanding of electronics, and with just a few hours of work, you can build your first bug and start playing the secret agent!
Obviously though, if you plan to use an audio surveillance system, made up not only of spy bugs and hidden microphones, but also of radio transmitters suitable for professional use, for example to resolve a case of marital infidelity, it is strongly advised to consult experts in this field, who could give you professional advice, according to your surveillance needs, and why not, to your budget.