home Heating calculation Superbug from an old mobile phone. How to make a bug with your own hands: diagram and detailed description Mobile “GSM bug”: an incredibly simple solution

Superbug from an old mobile phone. How to make a bug with your own hands: diagram and detailed description Mobile “GSM bug”: an incredibly simple solution

", and can also be assembled after quite complex structures such as "Wasp" or "Bumblebee". In general, the article is intended for beginner "Bugmakers" who have assembled and launched at least the first beetle. So. I would like to offer you one of the options: transistor bug that has good characteristics compared to conventional circuits. Of course, the circuit is not original and there is nothing unusual in it. And in order to assemble this circuit, you must at least be able to hold a soldering iron in your hands and distinguish a resistor from a transistor. That is, have at least a little work experience with a soldering iron. If something is not clear in the diagram, I strongly recommend that you first assemble the “First Beetle”, and read everything that is written in the first message, including links. It won’t make things worse, but it will increase your knowledge.

So let's return to our beetle.

The bug has the following characteristics:
Supply voltage: 0.8-1.7 V* (One(!) 1.5 V battery)
Sensitivity: 7-10M**
Range: 50-400M***
Current consumption: 1.5-2 mA
Operating frequency: VHF(88-108 MHz) or 180-200 MHz****

Notes:
* The bug is designed to be powered by one battery with a nominal voltage of 1.5V; higher voltage can lead to an uncontrolled increase in current consumption until the transistor fails!
** Sensitivity depends on the microphone used; with a Chinese microphone with a diameter of ~3 mm there are no complaints about the sensitivity; a quiet conversation can be heard well.
*** The range very much depends on the characteristics of the receiving device (receiver) used. On a Chinese two-button scanner it will be about 50M, and on a normal receiver it will be 200M. We managed to get 400M on a receiver based on CXA1691 with no standard circuit inclusions. The frequency was 180 MHz. You won't get this range on the FM band. At the same time, reception on 400M was good, if you don’t take into account that you have to stand in one place, move a little to the left or right and the signal disappears.
**** This article gives two versions of the bug for different frequencies, while the circuit diagram of the device does not differ, only the winding data of the L1 coil changes.

So here it is. Let's take a look at the diagram of this beetle. Here she is.

As you can see, the circuit does not contain complex components or non-standard values. All parts can be easily purchased or removed from unnecessary equipment. To increase efficiency, a choke is included in the emitter circuit of the transistor. With this switching on, the output power of the generator increases and there is no low-frequency feedback. Therefore, the sensitivity of the microphone is comparable to two transistor beetles. It is advisable to select a transistor with the highest hFE, although any high-frequency transistor will do. Right assembled circuit starts working immediately after power is applied. Resistor R1 can be used to select the required current consumption and output power. The connection with the antenna is made small, which somewhat reduces the output power, but increases stability. The beetle is made on a double-sided printed circuit board measuring 20x20mm on which all components are placed. SMD 0805 parts. However, conventional lead elements can also be used. If the board is double-sided, then the second side must be connected to the minus, preferably in several places. I installed the transistor S9018, but you can use SMD. The transistor can be replaced with KT368 or BFR93. I removed the choke from the Chinese scanner receiver. I also recommend that you take it from there. It is advisable to take parts such as according to the diagram, for example, it is not advisable to take 15 pF instead of 12 pF, although it is acceptable. Resistors with a deviation of no more than 10-15%. It is better to collect beetles on SMD. There will be better stability. You can, of course, assemble it on DIP, but it would be desirable to do it good quality, especially capacitors. Do not use red capacitors under any circumstances. Your bug's frequency will fluctuate greatly as the ambient temperature changes when using these capacitors. If you assemble a beetle like this (at the bottom of the page), then don’t be surprised that the beetle does not work, or works poorly.

The coil is wound on a mandrel with a diameter of 3 mm with a 0.5 mm wire and contains 6 turns for the FM range. Then the coil must be stretched as in the photo.

For the range of 180-200 MHz, the coil should be wound with a 0.5 mm wire on a 3 mm mandrel; the coil will contain 3 turns.

PCB drawing:

I cut the board with a regular cutter.

Photos of beetles:

Closer.

Yes, by the way, when using good batteries, the beetle can work stably for about a month. I tested for about a month. Then I just got tired of waiting and I took it off and measured the voltage on the battery - 1.2V. So he could work for another month. At the same time, microphone sensitivity and range remained the same. And the frequency drift was about 150 kHz.

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

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 want to say a few words about connecting the antenna, the signal is supplied to it from the emitter of the transistor, which makes operating frequency the bug is 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!

Good day!
In this article I’ll tell you how to make a super bug out of an old mobile phone to listen to an area within a radius of up to 20 meters at any distance from it.
For this we need:
1. Mobile phone with 1-button speakerphone capability
2. Radio components (1 capacitor with a capacity of 4.7 mF microfarads and a voltage of 20-50 V; 1 diode 1n4007, but preferably Schottky (1n5818, 1n5819, 1n5820, 1n5822); 2 reverse conduction transistors type KT315 or imported analogue BC847V; 2 resistors 10 kilo-ohms, no soldering iron high power with a thin tip 20-40 W, silicone glue for thermo-guns)
3. Direct hands and free time
We disassemble any phone in which the speakerphone function is activated with one button. I used Alcatel from-105.
First, let's get rid of the case, then remove the speaker, keyboard pads, vibration motor and LED backlight keyboards (carefully unsolder the LEDs).
We solder the diode in the forward direction to one of the speaker contacts, solder the minus of the capacitor to the second contact, and solder the plus of the capacitor to the plus of the diode as in the photo. Next, we take the KT315 transistor, solder the emitter of the transistor to the minus of the call acceptance button (internal contact), and the collector to the plus of the same button (external contact).
We solder a 10 kilo-ohm resistor to the base of the transistor, and solder the second end of the resistor to the positive of the capacitor. Now insert the SIM card, turn on the phone and make a call. After a second, the tube rises on its own. If you use a phone that has an auto-answer function for incoming calls, then you can skip the step described above (i.e., activate this function in the mobile itself).
Now we enter the phone menu and in the profile change the settings, select (CALL THEN VIBRATION). The second transistor needs to be soldered in the same way as the first, the emitter to the minus of the hands-free button, the collector to the plus, then solder the second 10 kilo-ohm resistor to the base of the transistor, solder the second end of the resistor to the positive contact of the vibration motor.
You can, of course, purchase high-sensitivity mini-microphones, but this will cost us another 500 - 600 rubles. One of the best high-sensitivity mini-microphones is “SOSN” (M4-B2 and other markings). You need to solder a small piece of insulated wire to the antenna contact. We charge the phone in the same way as we charged before.
After finishing work, to save energy, remove the phone screen. A battery with a capacity of 1000 milliampere/hour lasts for up to a month in standby mode; I haven’t tested it in talk mode, but (for our purposes, I recommend using a new one that has gone through several cycles of complete discharge and charging).
Z.y. As a SIM card, you can use the card from the kit without a monthly fee; specialists know that if you don’t put money on it, it works for about a year. We choose a cellular tariff with the option - pay per minute and talk for free for a long time. In the motive, for example, it’s next free (1.5 rubles for the first minute and half an hour you can talk for free, MTS has super zero... who knows what else - add to the list).

Last edited: 19 Feb 2012

13 Feb 2012

1 person likes this.
Your article?
What is the use of this bug?

13 Feb 2012
Dr. MefistO said:

What is the use of this bug?
Click to expand...

Something I also don’t understand is how the wiretapping will take place.
znamenieznam said:

listening to terrain within a radius of up to 20 meters at any distance from it.
Click to expand...

and how is this so within a radius of up to 20m and then at any distance...

13 Feb 2012
Something I also don’t understand is how the wiretapping will take place.
Click to expand...

you call from your phone to the “superbug” (c) (the receiver is picked up there) and listen
and how is this so within a radius of up to 20m and then at any distance...
Click to expand...

probably meant that the eavesdropper (caller) can be at any distance from the phone, and the phone should be 12-20 meters from the target being listened to
Added after 6 minutes
I don’t know about the author, but something similar is here _http://radioskot.ru/publ/povyshenie_chuvstvitelnosti_mikrofona_gsm_zhuka/1-1-0-323

Last edited: 13 Feb 2012

13 Feb 2012

1 person likes this.
Dr. MefistO said:

Your article?
Click to expand...

On the Internet, the idea of using old cell phones as bugs has been raised more than once. I read similar articles on many amateur radio forums. However, after reading them, many unclear questions always remained. Here I tried to describe some of these unclear points in more detail so that anyone with at least a little knowledge of electronics could assemble such a bug without problems.
Dr. MefistO said:

What is the use of this bug?
Click to expand...

The benefits are obvious. By calling a telephone converted in this way, we can always hear what is happening around it. As described, distance sensitivity up to 12 meters allows you to achieve automatic switching on speakerphone when making a phone call. If you replace the original microphone with a more sensitive one, then up to 15-20 m. When we call, first there is a beep and the handset goes up, then vibration and the speakerphone turns on. All this will happen absolutely silently, since we removed the speaker and vibration sensor from the phone. We only need a microphone. If we go further, we can disguise such a bug in various subjects(place inside the system unit or power supply of the computer, in almost any location that will not arouse suspicion among the victim). In the system unit, you can, for example, constantly recharge the phone through its original charger. So that when the PC system unit is plugged into the network, our phone will also be charged. You can also place this bug back into the case (if it fits *mrgreen*) or use a larger phone case that would fit with all the soldered parts. Thus, an imitation of a completely inoperative cell phone is created. Although we can always call it and listen to what’s happening around us. You can leave it in your desk drawer at work... There are many options, they can only be limited by our imagination...

13 Feb 2012
The system unit is of course of little use to the victim (fan noise + there is little conversation near the computer). And of course you can throw it in an apartment.
But such a superbug will last a week max in wiretapping mode
IMHO the game is not worth the candle, although if you want to play around you can

13 Feb 2012
Another option if you have large baseboards is to tuck them under the baseboard. Place the microcharger inside the socket and wires under the wallpaper (or carpet on the wall), slightly deepening the wall itself to do this, then carefully seal everything back *mrgreen*...

13 Feb 2012
znamenieznam, how will the pilot work be useful to someone? Seriously, I found it interesting to read. Many people have unnecessary phones lying around at home, but want to do something unusual. But still, the “super” prefix is more suitable for its dimensions. And power consumption...
I would like to see further development of the topic)
By the way, in addition to the dimensions, it is not difficult to find devices to which the sound was ultimately transmitted. The presence of any identifier is, in principle, irrelevant (in this case SIM). But there is encryption, unlike simple radio bugs

13 Feb 2012
Today I discovered that our bug fits into the base of such an ordinary table lamp
And not alone, but together with the board from the mini charger, which was previously carefully filled with silicone glue for hot-melt guns.
1. We connect the power wires from the charger board, intended for connection to the network, with the wires that come out of the lamp power button at its base.
2. We solder the wires that should go from the charger to the phone to the charging contacts on the bug board, respectively - plus to plus minus to minus.
3. As a result, we get that the bug’s battery, when the lamp is turned on (through its charger board), will also begin to charge. When you turn off the lamp with the button, charging stops. This will ensure that the bug is almost always ready for use with a charged battery. In addition, it will significantly extend the life of the battery itself - compared to the case if it was constantly charged when the device in which it is placed is plugged into the network.
z.y. at a distance of 10 meters everything can be heard perfectly, but I replaced the original microphone from the phone with a more sensitive one.

Last edited: 14 Feb 2012

14 Feb 2012

1 person likes this.
Let's continue the topic of creating GSM bugs from mobile phones...
The main problem in the production of GSM bugs, as is known, is the low sensitivity of the microphone.
Turning on the speakerphone when making a call and replacing the microphone with a more sensitive one (pine M4B2 or from a Chinese capsule tape recorder - here it is desirable that the back side of the microphone is brown and not green since they are much more sensitive) increases the speech recognition range significantly. Lavalier microphones from voice recorders like Ritmix 101 and others also have very good sensitivity. I’ll tell you from my own experience that I achieved all this without any problems, but speech recognition in another room, even with all the listed advantages, was far from ideal. And I wanted to get a superbug - with speech recognition sensitivity up to 30 meters and preferably independent of the presence of obstacles - such as closed doors. To create such a beetle, among other things, I needed a powerful amplifier for the microphone itself. After digging around on Google, I managed to find circuit diagrams for such amplifiers. http://cxem.net/radiomic/radiomic131.php
Having collected them, I did not get what I expected and increasing the power to these circuits in the hope of getting high-quality amplification, I ended up burning all the beetle’s microphones. The overwhelming despair brought a great idea to mind. What if you try to use a circuit from a hearing aid as a microphone amplifier? The result was simply amazing! I used a Chinese-made hearing aid XINGMA XM-999 (the cost of a new one is 450 rubles - maximum gain 133±4dB).
We solder the plus from the phone microphone through a wire (it’s better to take it from a wired microphone or headphones) to the plus of the signal output from the hearing aid (where the earphone is connected), and the minus to the minus, respectively. As a result, when I turned on the hearing aid and made a call to the phone, the sensitivity exceeded all expectations. Even Chinese capsules costing 8 rubles apiece picked up speech much better than pine-type microphones costing 500 rubles without amplification through a hearing aid. Having replaced the microphone native to the hearing aid with a pine M4-B2 (2 pieces), I received clear speech recognition with amazing sensitivity in any room, even with behind closed doors. Plus the ability to smoothly adjust the gain by turning the hearing aid wheel from 0 to 8. The hearing aid is best powered by a battery, which should be charged through a separate charger for finger batteries with a timer. If we use such a device, then when we make a call to the phone and simultaneously charge the hearing aid battery, we will not hear any extraneous interference resulting from charging (in the case of simultaneous charging of the phone and the hearing aid from one charger). In addition, the timer will allow us to protect the hearing aid battery from overcharging and automatically turn off charging after its maximum capacity is filled. I used a circuit from a charger with a timer for ROBITON TF 250-4 AA batteries (cost 200-250 rubles). It allows you to turn off the battery charge automatically after it is fully charged. You can use a finger-type battery (in the case of a hearing aid power supply of 1.5 V, but if it is 3 Volts, I recommend using a battery from any cell phone - first it is better to remove the mini-circuit with contacts and solder directly the plus from the charger to the plus of the battery, minus to the minus, respectively ). To get rid of 2 wires going to the 220 V network (from the cell phone charger and the hearing aid battery charger), we connect them into one. After this, when the wire is plugged into the network, we will get simultaneous charging of the cell phone battery and the hearing aid, which will allow us to stay in touch with the bug at any time. If such a beetle is mounted in table lamp, then he will live there almost forever, provided that it is turned on once every 3-5 days.
However, even if our superbug phone is completely discharged (the lamp has not been turned on for longer than the life of the bug’s battery), we can use the KT 315 transistor to close its power button. This will ensure that when the lamp is turned on, the completely discharged phone will turn on and the batteries – the phone and the hearing aid (in our case, a powerful microphone amplifier) will be charged.
As a result of our work we received:
- automatic answer when calling the phone
- turn on speakerphone when calling (automatic)
- powerful amplification of a cell microphone through a pocket-type hearing aid circuit
- when connected to the network, simultaneous charging of 2 batteries of a cell phone and a hearing aid
- no interference when calling (since charging comes from 2 independent chargers)
- bug sensitivity up to 30 meters with smooth adjustment using the hearing aid wheel
- turning on the cell phone even when completely discharged - when its charger is plugged into the network
- and a number of other benefits that you can add yourself