An TX for HF anti burglar of pocket

It's a small UHF transmitter that emits a signal received by a receiver (for the latter see the following article): As they are coupled (close), all is well and there is silence, but if they are away, the receiver starts screaming! If we place the small transmitter on an object of value on display, by winning the thief will give the alarm. It can also be put on the collar of a dog to prevent it strays too far without our knowledge.

Figure 1: Diagram of TX for locks pickpocketing.

This anti-theft system to pull HF can be used in many practical situations and each time we want to be notified of the removal of an object, animal ... and why not a dependent person we would have custody ? For example it can be used to protect packets in a store frequented by customers (thieves): The transmitter is easy to hide in the package to protect, but it can also be set as a precious object presentation ... the lust of the public.
In all these cases the thief, "taking his legs to his neck" with the object triggers the alarm (tripping due to the remoteness of the TX and RX): RX buzzer begins to scream. One can also use it on a trip not to forget a bag or suitcase, the issuer is in the bag they are afraid of forgetting and the receiver is worn. You can still set the TX (protected in a small plastic box) while the dog's collar fool who tends to "make beautiful", again it is the RX on oneself or nearly so. Same thing for a child or a dependent person who would no longer "lost her mind.
In the latter case (animals or people), nothing to fear because the issuer that we will build on work in UHF 433.92 MHz with a very low power (nothing to do with the frequency and power of a mobile phone) .
The construction of the TX will not be a problem if you bring the attention to your work.
It is a montage dedicated course for beginners. Figure 1 and the list of components will allow everyone to get it right.

Figure 2: Photograph of a prototype of platinum anti-theft system for the TX-pocketing.

hybrid module transmitter can be directly soldered into holes in the PCB and then inserted into a socket strip. Integrated circuits are mounted on stands. The 12V battery is determined by its electrodes welded to it. The UHF antenna is a simple piece of insulated copper wire 17 cm. The small dimensions of the TX dissimile can quite easily in almost everything (or in all) coveted precious object.


Iist ET587TX
R1 ..... 220 kΩ
R2 ..... 47 kilohm
R3 ..... 100 kΩ
R4 ..... 220 kΩ
R5 ..... 4.7 kΩ
R6 ..... 3.3 kΩ
C1 ..... 22 uF 35 V electrolytic
C2 ..... 10 nF 250 V polyester
C3 ..... 22 uF 35 V electrolytic
C4 ..... 10 nF 250 V polyester
U1 ..... TX433SAW
U2 ..... NE555
U3 ..... MIC145026
LD1 .... LED 3 mm green
SW1 .... slide switch

Miscellaneous:
1 support 2 x 8-pin
1 support 2 x 4-pin
3 2-pin jumpers
1 row female / male 15 holes / pins for the hybrid module
1 pair of clips for battery 12 V for this