This scheme was developed in connection with the need to listen to a neighbor. I think it won’t be difficult even for beginners to make such a wiretapping bug, since the device contains only a couple of parts. Despite the simplicity of the design, the device is highly stable due to the use of the KT325V transistor.

The operating frequency of this transistor is above 1000 megahertz; I do not recommend replacing it, but you can also use KT368 or an imported analogue of S9018. The capacitors are non-polar; imported ones were used in this circuit, but I highly recommend using domestically produced tubular ones.

An electret microphone will do, but for greater sensitivity it is advisable to use a microphone from a Chinese tape recorder. The installation is done on a small printed circuit board; wall-mounted installation is also possible, but the quality of the bug may suffer as a result.

Beginners often confuse the polarity of an electret microphone, and I specifically attach a photo to the article; microphones from imported manufacturers usually have two contacts.

The negative of the microphone is connected to the body by lines, and the other contact is the microphone input. The range of such a bug reaches 70 meters with direct visibility, just an excellent option for wiretapping neighbors. The beetle is caught on an ordinary Chinese-made FM receiver. The antenna is a piece of multi-core insulated wire with a length of 20 cm.

The range of supply voltages is quite wide. The power source can be a battery from a mobile phone or a crown with a voltage of 9 volts; the device also starts working on two AA batteries.

The finished bug is usually received in the region of 91 - 98 megahertz (fm). Using a variable capacitor, you can adjust the frequency of the beetle to any range within fm. The coil is wound on a frame with a diameter of 5 mm and contains 6 turns of wire with a cross-section of 0.5 mm (0.3 - 1 mm).

Microphone sensitivity does not exceed 5 meters, but it is possible to add a microphone amplifier to the KT315, then the sensitivity will increase to 7 meters. And in the end I want to give some tips on setting up.

1) When setting up, try not to touch the device with your hands
2) Before assembly, check all parts for functionality, including the microphone.
3) The bug is difficult to catch on digital technology, so it is advisable to use Chinese receivers.
4) Check the charge of the transmitter battery being used.

The principle of regulating the rotation speed of DC electric drives is based on regulating the average voltage value supplied to the motor. Pulse control allows you to create drives with high energy performance.

Various spy things have always attracted people. And of course, every self-respecting radio amateur has a homemade bug in his collection. If you are just starting to get acquainted with electronics, then you will most likely not be able to assemble a complex device and configure it. Therefore, we suggest assembling the simplest bug with your own hands. It consists of a minimum number of parts and is easy to customize.

How to make a bug

• L1 – 4mm mandrel. 5 – 6 turns.
• L2 – 4 – 5 turns on top or inside L1. Wire 0.5mm. If necessary, experiment with coil placement and turns ratio.
• Transistor - KT368 or KT3102.
• Microphone - from a tape recorder or from a mobile phone.

As you can see, the circuit is very simple and contains a minimum of parts that are freely available (soldered off from old electronic devices). Therefore, making such a bug with your own hands will not be difficult. It’s up to you to decide how to install the elements: you can use a hinged method, or you can do it on a printed circuit board.

Setting up a homemade bug

Another problem may arise due to the microphone. The fact is that microphones from different companies differ in resistance (~1.1 kOhm). If greater output power is not required, then R2 can be increased to 200 Ohms. Then the current consumption will be 7 mA (100 - 150 hours of operation from the Krona battery).
You can use other microphones, for example, MKE333 or Sosna. Also, the microtransmitter can be powered from 3 - 5 V, but then you will have to select R1 so that, at the base of the transistor, the bias voltage is 1.1 - 1.2 V.

Now you know how to make a bug with your own hands, investing a minimum of money.

Based on materials from the site: cxem.net

On the Internet you can find a huge number of radio bug circuits. Some circuits are too complex and require configuration, others include scarce radio components, and still others don’t work at all!
I bring to your attention a diagram of a bug that can be assembled by both an experienced radio amateur and a beginner in this matter.
Let's look at this diagram:

Ignore the dotted line for now.
To make a bug we will need the following parts:

• VT1 - kt315 with any letter index (if you want to increase the range of the bug, it is better to use a microwave transistor, for example kt325 or kt368, the imported transistor s9018 is perfect);
• C1, C4 – 47...68nf;
• C2, C3 – 10pf;
• R1 – 33 kOhm;
• R2 – 100 Ohm;
• Oscillatory circuit L1 - 8 turns of copper wire with a diameter of 0.3...0.5 mm on a rod from a helium pen, wind carefully, turn to turn (I unsoldered the finished coil from a broken radio).
• M1 – electret or condenser microphone.

To save space, I used the right microphone (I found it in an old cell phone). Despite its size, it turned out to be very sensitive.
All parts except the L2 choke and microphone are shown in the following picture:

To make L2 we need a match and very thin wire:

We measure one and a half centimeters of matches, bite them off - this piece will serve as the core of the choke. Next, take the wire and wind one hundred turns. We fix the terminals of the resulting coil, clean it of varnish, and tin it. That's it, throttle L2 is ready!

When all the parts are assembled, you can start making the printed circuit board.
To do this, we need a 35x15mm piece of PCB and the solution itself in which we will etch the board (I used hydrogen peroxide + citric acid). Making a drawing of the printed circuit board (I drew it for the s9018 transistor)

and transfer it to the textolite.

Place the board in the solution and wait until the excess copper disappears.
After the board is etched, we take it out, rinse it with running water, remove the varnish and tin it:

Next, solder the parts in accordance with the diagram. Attention, when installing parts on the board, do not overheat them, otherwise they will fail! Be especially careful when installing VT1.
I would like to say a few words about connecting the antenna; the signal is supplied to it from the emitter of the transistor, which makes the operating frequency of the bug more stable.
Assembled diagram:

The bug can be powered in the range from 1.5 to 9 volts.

Any of these batteries will be suitable to power the circuit. I used a AAA AA battery to make the bug more compact. You can also use a 3-volt “pill”.
If you will power the circuit from the crown (9 volts), then you should include a 100 Ohm resistor R3 in the circuit.
Carefully solder the battery to the bug. An insulated wire 30 cm long can be used as an antenna, but practice has shown that its absence will not greatly affect the reception range of the circuit. That's it, the bug is ready!

Now turn on the radio and look for the frequency of our bug. The signal from it can be caught at a frequency in the range of 88-108 MHz. For me this frequency was 92.2 MHz. If the bug “does not communicate,” then try moving apart the turns of coil L1 - this should help solve the problem.
With a supply voltage of 1.5 volts, the reception range is 30 meters; if you increase the voltage to 3 volts, the reception range will increase to 100 meters.
This circuit also has another application - an audio transmitter. Let's say you need to output sound from your phone to a tape recorder, but the latter does not have an audio input function. No problem! In this situation, this scheme is very useful. Almost all tape recorders have a radio reception function (FM radio), which is what we will use. Remember the dotted line on the bug diagram? We exclude microphone M1 from the circuit, connect capacitor C5 to a capacity of 10 μF, connect a 3.5mm mini-jack plug to the minus of the capacitor and the minus of the power supply (minus of the jack to the common one, left/right to the minus of the capacitor) and transmit sound from the phone to any radio receiver located within the range of the transmitter! If the parts are installed correctly, the circuit begins to work immediately.
These products can be used for a variety of purposes: from indoor listening to wireless sound transmission.
And this is where my article comes to an end, good luck to everyone in repeating!

Instructions

A simple listening device can be assembled from an old mobile phone. You just need to disassemble and remove the vibration alert from the board, and instead solder a transistor that closes the raise button. It turns out that the handset is automatically picked up and listened to. And then everything is simple. You need to leave your phone in a bugged place and call it. Picking up the handset turns on, you can use your phone to do everything that is happening and everything that is about.

Another method for making listening devices is a simple bug using microelements. This consists of a power supply, antenna and microphone located in some small housing.

So, take a piece of plastic and use a knife to cut out the required dimensions for the base of the bug. Take into account what kind of case you use for it. It could be a mobile phone, a pack of cigarettes, a powder compact.
Using M2 screws, secure the battery, helical antenna and printed circuit board of the listening device to the base.

Attach a button microphone and a power button to the base. If desired, you can attach an LED to the base. Then the bug will show whether it is on or off. Assemble all the parts together on a plastic base. Decorate the bug in the selected body.

Tune the bug using an FM radio receiver with smooth frequency control. The disadvantage of this bug is that it can only be wiretapped from the receiver. The previous model was wiretapped from a mobile phone, which seems more convenient and maneuverable.

Thanks to cinema and detective stories, everyone knows that a “bug” is a miniature listening device, camouflagedly attached to secluded places in offices to monitor ongoing negotiations. In modern industry, a large segment has been developed for the production and distribution of sophisticated spy devices, which in all official documents are called special audio monitoring equipment, and secret recording for conducting operational-search activities.

Instructions

Such equipment has been mass-produced for a long time and is on “almost free” sale, that is, it can be purchased after obtaining the appropriate license. If you wish, with the necessary equipment and imagination, as well as possessing some skills, it is quite possible to create “” yourself - at home or for business. To do this, purchase the smallest size. The smaller they are, the more convenient you can disguise the device during installation.

Obtain such microphones by removing them, for example, from digital voice recorders or concert headsets used by artists when performing on stage.

Then think over and provide a method for transmitting the data for which you plan to use the obtained microphone. If you have the skills to design and operate a radio, then use the wireless method via Wi-Fi or Bluetooth.

In turn, use a cable connection for the microphone if you are interested in proper quality of listening and recording, because with this method noise interference will clearly not pollute the airwaves.

It is not enough just to successfully make a listening device; it is more important to install it professionally, while ensuring absolute inconspicuousness in combination with the surrounding environment and the maximum duration of effective use. In order not to be subjected to criminal prosecution under the relevant article, use quite common commercially available means as “bugs” for audio monitoring of the situation in the room and secret recording: microphones for mobile phones, small-sized voice recorders and webcams, but installed in a disguised manner, so they are not noticeable into the eyes of those present.

Video on the topic

Sometimes there are situations when it is necessary to remotely control the situation in one place or another - at home, in the office or in the car. Listening devices, of which there are a great many today, help with this. But it’s not at all necessary to go and spend money on fancy spy devices. You can easily deal with this problem on your own.

Instructions

Use a special program for, which allows you to remotely control all kinds of sounds and notify you about them. SkypeSpy can be used as an alarm for a home or office, can monitor the status, and, of course, it can be used as a .

Place with the installed program in a place where you need to control sounds (in a children's room, in an office, etc.). The communication software connects to another device and when it detects any sound, the smartphone sends an SMS, MMS or calls. Such programs can be found on ExSmart.Net, smart60.ru, alldown.ru, M-TEL.ru, dimonvideo.ru.

If you need to wiretap via a modem, download the ModemSpy program. Install it on your computer. Select File -> Preferences, in the Hardware tab, select your modem. In the Recording tab, configure call recording modes.

Using the first setting, you can set all incoming messages and the recording start time counter to automatic. The second is responsible for outgoing calls. The last setting is responsible for filtering recording files of certain sizes. The downside of the program is that you cannot record and listen to a conversation at the same time, as you can butt into it and find yourself. Link to download the program - http://www.izone.ru/business/communication/modem-spy.htm.

If you want to make wiretapping yourself, use the diagrams for making wiretapping bugs. There are plenty of them on the Internet, from basic to professional. This will require certain skills and experience in radio electronics.

If you need to wiretap the next room, use a microphone and a recording device (even a player). You can install such a device on a cabinet, or in a lampshade or sconce and lead the wires to the next room where the signal will go.

Use a statoscope. A primitive method based on the “glass to door” principle, but, oddly enough, it works. But this is absolutely in emergency situations, but you won’t have to spend money on expensive equipment or computer programs.

Sources:

• wiretapping how to do

Films about government conspiracies and special agents are replete with a wide variety of wiretapping devices. It seems that all this is beyond the reach of “mere mortals,” but today you can easily make a bug for wiretapping, like in those very films, at home with your own hands. This is not difficult, and with a little experience in radio electronics, you can make it yourself.

For beginner radio amateurs, the following lesson on making a bug may seem too complicated. The transmitter circuits are quite simple, but setting up the radio transmitter circuit can cause some difficulties. This scheme uses a minimum of parts. The transmitter power is not that great, the range is approximately 100 meters in line of sight. But for a homemade radio bug, this is very good.

We will need

It is not at all necessary to purchase parts for the circuit. For example, you can take the M1 electronic microphone out of an old Chinese voice recorder. Capacitors and resistors can be removed from any radio board. Remove transistor VT1 C3013 from an old transistor Chinese player. The L1 coil is easy to make yourself. To do this, take a varnished copper wire (diameter 0.5 mm), wind it turn to turn on a 3 mm mandrel and bite off the excess with wire cutters. Remove any varnish from the ends. Copper wire is also suitable for an antenna. Just cut 30 cm from the wire, bend one end into a ring, strip the other and tin it. Also purchase a 3V battery. That's all the parts we need.

And here is a diagram in which only the most necessary details are left, which we have already become familiar with.

Installation of a radio bug

To assemble the circuit, you don’t have to design the board yourself. Just take a small piece of double-sided foil PCB 2x3 centimeters. On one side of the PCB, use a cutter to cut the foil into a couple of pieces (as many as needed to install the parts). Everything then needs to be carefully tinned. As you can see, this is not so difficult if you already have some experience in creating electronic homemade products.

On the second side, cut into two parts - larger/smaller. Most of it needs to be made in size so that the battery fits. You will get a positive contact, and for a negative contact, take a bent piece of stripped copper wire or a small rectangular piece of a spring (you can take it from a watch). Make a small cutout on the board for the microphone - this will reduce the size of the entire structure.

Now solder all the parts according to the diagram. We solder the negative contact for the battery on the other side, do not forget about the connecting wires for power. Also solder the microphone in the correct polarity.

Setting up a radio bug

So, is the assembly complete? Now the most interesting part: insert a battery into the bug, take any FM receiver, and try to catch your voice in the speakers. If it doesn’t work the first time, try slightly moving the turns of coil L1 apart, then try again. When the signal is caught, you will be able to achieve the desired frequency without any problems: when the turns are shifted, the frequency of the transmitter decreases, when moved apart, it increases. Just tune in to the frequency you need and enjoy the work done!