In order to organize wiretapping, you can resort to several ways to implement your plans. Electronic tracking devices can be purchased in stores or ordered online. However, a high-quality one will cost the consumer a pretty penny. As a rule, cheap Chinese devices quickly break down, and they don’t particularly stand out for their practicality. There is only one thing left - to make a bug with your own hands, especially since this is quite feasible, and the cost of components (in order to manufacture this or that audio surveillance device) is essentially symbolic. Anyway, let's get down to business.
Legal grounds
Of course, you need to understand that special means for wiretapping are the prerogative of the intelligence services. In case of violation constitutional rights personality and proven guilt in violating the privacy of private life will be subject to administrative punishment. There are often cases when it comes to criminal liability. Therefore, you should not “abuse” the manufactured product. It is much wiser to use such a device as an additional means of security or to use it to implement acoustic control over the territory of your own home. For example, a home-made wiretapping bug will be an excellent “informant” if you are not sure of the integrity of the nanny you hired or want to know what is happening in class at school. You never know life situations when the use of listening devices becomes necessary.
Mobile “GSM bug”: an incredibly simple solution
In order to make a listening device from a cell phone, you need a device that supports the “Auto-hook up” function, and you also need a headset (headphones). The device can be considered the most suitable for such purposes, since the simplicity and reliability of the phone allow us to count on the success of the implemented project. By the way, this is a sign of efficiency; the energy consumption of the device is significantly reduced. Believe me, such a phone bug, configured with your own hands, is an excellent substitute for expensive listening equipment. Moreover, literally everyone can perform the simple actions described below. Let's get started.
- Go to the phone menu and enter the “Call Mode” section.
- Create your own personal regime. All items related to light indication, vibration, volume of the signal melody, screen saver, sound of button presses and notification of an incoming SMS message must be deactivated.
- Give the new mode a name.
- Through the main menu, find the “Setting up accessories” section, which usually has two sub-items “headset” and “hearing aid”. In each of them, it is necessary to edit the operating parameters and the question of how to make a bug will be practically resolved.
- All “accessory” items must be included. Assign the newly created mode as active and exit the settings.
- Cut the cord from the headphones and insert the plug into the headset jack.
- The display should show the activated mode.
Using a smartphone for purposes other than its intended purpose
When you go on a business trip or vacation, you can leave a kind of watchman at home, a mobile “security guard,” so to speak. Moreover, you don’t need to solder anything, and the cellular bug is a converted smartphone with your own hands. Everything else is simply primitive.
- Almost all smartphones are equipped with the “Auto-receive calls” function.
- Relatively new cellular units implement energy-saving mode technology. Therefore, if you take into account the known good condition of the device, you can count on 5-7 days of battery life.
- An option is possible when the phone is connected to the charger, and a special device with a time relay acts as an intermediary between the outlet and the charger. An hour a day is a completely acceptable energy supply mode (taking into account the situation described above).
- Turn off the sound notification, light indication and vibration mode on your phone.
- It would not be superfluous to take such an action as installing headphones into the headset jack, since the sound background around the caller will be an unfavorable signal that will predetermine the location of the spy device.
- Place the device in the middle area of the living space. Don’t forget: the device doesn’t have to be in a visible place, but it’s not a solution either. Place your phone on the mezzanine or attach it to the back of a hanging picture.
Wiretap bug: do-it-yourself using “improvised means”
As a rule, they are not thrown away. Find your long-forgotten “electronic companion”, because it is from this that you will make an effective sound-catching device. It is worth noting that almost any phone can be converted into a listening device. However, size plays an important role in the “life of a spy.” Therefore, in such a delicate matter as wiretapping, it is more advisable to use small phone models.
General sequence of actions
- You are disassembling the phone.
- Remove the screen and remove all LEDs (keyboard backlight - leave one for visual control).
- Solder in the power button.
- Install the device - “Automatic call answering”, because the bug must pick up the handset with its “hands”.
- Replace the microphone with a more sensitive one (electret).
- Extend the antenna (regular copper wire 15-20 cm).
- Solder the battery and fix it on top of the keyboard pad (rubber band, tape).
- Check the functionality.
The optocoupler shown in the diagram can be replaced with a transistor like KT315 or Western analogues S9018, S9014. In this case, the capacitor is removed and a resistor is installed with a resistance value of 2.2 k.
Miniature bug
You can make an FM transmitter with your own hands. Enough simple circuit will allow you to receive a signal in the radio frequency range 88-92 MHz. You shouldn’t immediately run to the store and buy parts; perhaps you have faulty electrical equipment, from the board of which you can remove the necessary components.
You will need:
- Bipolar transistor - 2N3904 or its equivalent.
- Resistors - 4.7 and 330 kOhm.
- Capacitors - 4.7 pF, 1 and 22 nF.
- Trimmer capacitor, rated 30 pF.
- Contour coil - winding diameter 6 mm, eight-turn, wire 0.5 mm.
- The material for the board is foil fiberglass.
- 9 W "Krona" battery.
- (the most sensitive is used in tape recorders).
Assembling an FM bug for wiretapping
- First of all, the trimmer capacitor is soldered in (middle of the board). The transistor is mounted on the left.
- Moving to the bottom, we install (from left to right) capacitors: the first - 4.7 pF, the second - 1 nF.
- Now we solder in the resistors.
- After that - a 22 nF capacitor and a frameless coil.
- The design is completed by the wire - antenna, installation of a microphone and soldering of the battery.
In conclusion
Now it’s no secret to you how to make a bug out of a phone and what is needed for this. The options for GSM and radio products presented in this information review are only a part of the many available electronic samples through which high-quality acoustic monitoring can be established. However, it should be noted that practicality and quality are achieved through the application of the above recommendations. However, perhaps there will be a “folk craftsman” who will come up with a more rational way to realize the excellent performance characteristics of his listening-type inventions. Well, for now we will use what we have. Listen carefully!
Today I would like to offer another way to increase the sensitivity of the microphone of mobile bugs. A similar article was written earlier, but radio amateurs began to complain that it is very difficult to find mobile phones in which the hands-free function is activated by just pressing one button. For those who do not know what I’m talking about, I advise you to read the previous article about boosting, and those those who have already read - let's continue. So, we take any mobile phone (preferably a cheap one, black and white - they will hold a charge for a long time), disassemble the device, take out everything - the vibration motor, button pads, microphone and speaker, leaving only the screen, but at the end of the work it also needs to be removed.
We take just one diode, a 50-volt polar capacitor of 1-10 microfarads (capacitors with a voltage of 16 or 25 volts are suitable), a low-noise reverse conduction transistor, for example, type KT315, KT3102 or imported S9018, S9014 and a resistor from 1 to 10 kilo-ohms.
We apply solder to the contacts of the green button (answer button), then take the transistor, solder the emitter of the transistor to the minus of the button, and the collector to the plus. We apply solder to the speaker contacts, connect a diode to one of the contacts in the forward direction, solder the minus of the capacitor to the free contact of the speaker, and solder the plus of the capacitor to the free contact of the diode.
Then we solder our resistor to the plus of the capacitor, the second end of which must be soldered to the base of the transistor. Now we put the card in the phone and turn on the device.
When you make a call, the handset rises by itself, if everything works, turn off the mobile phone and remove the card. We desolder the phone microphone, but the microphone has polarity! We remember the polarity of the contacts on the phone, but it’s better to just mark where the minus is and where the input is. Next, we find a microphone from a Chinese tape recorder and assemble the circuit of a simple microphone amplifier, which is shown in the figure, the amplifier may be different, but this one was personally assembled more than once and works perfectly.
The amplifier will be powered separately, to power the amplifier we use another battery from a mobile phone, connect the output capacitor of the microphone amplifier to the input contact on the microphone, connect the minus of the microphone contact to the minus of the microphone amplifier. This way we get very slight distortion, but this is compensated by greater sensitivity - up to 10 meters.
We fix both batteries on the mobile phone board, strengthen the microphone amplifier with insulating tape and silicone, and finally remove the phone display. You can hide it in a cigarette pack, don’t forget to make a small hole for the microphone. Until we meet again - Arthur Kasyan (AKA).
Discuss the article IMPROVING THE SENSITIVITY OF A MOBILE BUG
I bring to your attention a spy radio microphone with extremely low power consumption. This is perhaps the longest lasting bug I have ever collected.
Of course, you have to pay for the low power consumption with a short range, but for many purposes this is quite enough.
The radio microphone confidently penetrates two reinforced concrete walls, and in open space the range will be from 50 to 200 m (depending on the steepness of your receiver).
The bug's circuit is incredibly simple and contains only 6 radio components, not counting the battery:
Coil L1 - 4 turns with 0.5 mm wire on a Ø2mm mandrel. Choke - 100 nH for surface mounting. Transistor BFR93A (the main thing is not to confuse it with the pnp transistor BFR93).
and etched in ferric chloride: 
All this took about 20 minutes. Then I tinned the finished board and cut off the excess: 
The most difficult thing is to connect the battery. I had at my disposal an old (!!!) CR2032 lithium battery (which is usually found in motherboards to power the BIOS chip).
To avoid unnecessary wires, I simply glued a strip of tin from a tin can to the back of the board (this will be the negative contact): 
The remaining piece of tin was useful as a positive terminal: 
The battery must be tightly inserted into the resulting slot, like this: 
All that remains is to solder all the parts onto the board according to the diagram: 
I'm sure it can be made even smaller. Replace the microphone, place the parts closer together, take small watch batteries and you're done. It will be possible to stuff the entire circuit, for example, into the body of a marker.
I used a 6 cm long wire as an antenna. The choke was made by winding a thin enameled wire on a piece of toothpick (80 turns). 
The microphone, of course, is too big for such a circuit, but I didn’t have anything else. In general, any electret with a diameter of 3-10 mm will do. Usually they are taken out of any telephone or intercom handsets.
By the way, the circuit does not work without a microphone - power goes through it. It also acts as a current stabilizer.
It is important not to confuse the polarity of the microphone: the negative terminal should ring into the body (that is why I put it in heat shrink, so that God forbid, nothing short-circuits). 
The frequency is adjusted by compressing/stretching the coil turns. In my case, the bug was caught at a frequency of 424.175 MHz. The signal level at such a distance, naturally, goes off scale: .jpg)
If you wind 11 turns on a 2 mm mandrel, the frequency will be approximately 150 MHz. In general, this bug works up to 1 GHz. I didn’t try further, because... nothing to catch.
To test the range, I went outside and walked around the house. Amazingly, in the room where the bug remains, every rustle is clearly audible.
P.S. This tiny bug worked on a half-dead battery for almost 2 weeks! It’s scary to imagine how long it would last on a new one, because the current consumption is only 300 µA. 
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