Circuit diagram of amp and burglar alarm made by old mobile phone

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Nowadays, mobile phones in the city are very common, almost one person per person, and the new models are changing with each passing day. The mobile phone replacement is faster, and the old mobile phones that the family has eliminated are a pity. Can I use my old phone to transform it into other usable home appliances? The answer is yes. At present, China Unicom and mobile communication companies have launched the Volkswagen Economy Card. For the called mobile phone, this card does not charge for all incoming calls and the landline fee is very favorable. We use this card to make the media of the above device to complete the production. In the author's home, there are two Ericsson GH398 and Waveguide RC928 mobile phones that have been eliminated. The two devices have been restructured separately. The results are as follows:

Figure 1 Remote home appliance remote control circuit

The remote home appliance remote control circuit is shown in Figure 1. It can be seen from Fig. 1 that the calling mobile phone 1 or the office telephone dials the called mobile phone 2, and the called mobile phone rings, and we take its ringing signal as the starting signal of the circuit. This ringing signal can be taken from the A and B points on both ends of the handset speaker SP of the called mobile phone, and can also be taken from the C and D points on both ends of the power supply of the vibration motor M in the mobile phone. After the called mobile phone rings, it is driven by the diode V2 rectifier capacitor C2 to drive the thyristor V to conduct. The relay J is electrically connected, and its pair of normally open contacts J1 is closed to achieve self-holding. At the same time, another pair of normally open contacts J2 is closed, the AC contactor coil 220V power is turned on, the contactor K is electrically attracted, the normally open contact K1 is closed, self-holding is realized, and the other pair of normally open contacts K2 are closed. Turn on the power supply of the household appliance F2 to realize the work of the remote control appliance. The purpose of adding contactors is to remotely control high-powered appliances. Such as electric heaters, rice cookers, air conditioners, etc. These appliances are remotely connected to the power supply 15 minutes before work, and can be used after returning home, saving lunch breaks. If the remote control is a low-power appliance, such as an electric lamp, it is not necessary to install an AC contactor, and the relay of this circuit can be directly opened with the contact J2. To cut off the power of the remotely controlled home appliance, simply press the stop button TA circuit of this circuit to reset.
Because this circuit takes the ringing signal of the mobile phone, as long as the called mobile phone rings for a few seconds. The thyristor V can be triggered to be turned on. At this time, the calling mobile phone can be turned off, the call is stopped, and the called mobile phone does not answer, so neither the calling party nor the called mobile phone charges. The power of this circuit can be taken from the battery E in the mobile phone or the mobile phone charger. If the battery power is used as the circuit power supply, the battery voltage should be 6V, because the circuit relay is 6V, otherwise the charger is used as the power supply.

Figure 2 burglar alarm circuit

The burglar alarm circuit is shown in Figure 2. The circuit consists of an infrared detector HW, a mobile number confirmation circuit (J2, C1) and a dialing circuit (NE555, J3, etc.). Store the mobile phone number you carry with you in the modified mobile phone. When there is no one in the house, the power switch S and 12V DC power supply of the closed circuit are added to the infrared detector, and the detector works electrically and enters the waiting state. When a bad person enters the home, the infrared detector starts, the internal relay normally open contact J1 is closed, the working power of the circuit is turned on, the relay J2 is momentarily closed, and the YES button (confirmation and dialing button) on the mobile phone is turned on. Under the action of the capacitor C1, J2 is turned off again in about 1 second, which is equivalent to pressing the button by the human hand to confirm the stored number. Then, as the charging voltage of capacitor C2 gradually increases, the level of pins 2 and 6 of IC1 gradually decreases. When it is lowered to the inversion level of IC1, the circuit flips, the 3 pin outputs a high level, the relay J3 closes, and the YES button is turned on. The modified mobile phone dials out the saved number. This time is about 2 seconds (delay time) and can be adjusted by potentiometer RW. At this time, the phone number of the home is displayed on your mobile phone. If you confirm that someone has entered the home with this number, you should take immediate precautions. When the mobile phone displays the electric number, press the close button NO, and the call is not answered, so that the two mobile phones not only serve the alarm but also do not charge.
Modification and component description For the circuit of Figure 1, it is only necessary to drill two wires in the appropriate position near the handset of the handset to connect the circuit. For the circuit of Figure 2, just drill the hole near the YES button on the mobile phone, and take two wires from the mobile phone circuit board and connect them to the normally open contacts of the circuit relays J2 and J3. In the two pictures, the connection between the mobile phone and the circuit is preferably a connector, which is mainly convenient for installation. Finally, put the above circuit part in a suitable box. The component parameters of the circuit are indicated in the figure. The 6V relay is selected with any two pairs of normally open contacts. The 12V relay can be selected only with a pair of normally open contacts. The AC contactor can select any voltage of 220V and current of 25A. One type, the power transformer is selected 5W, the infrared detector can be selected by Guangdong Zhongshan Dahua Electronics Factory, and can also be selected by Guangxi Guilin Shida Mail Department. The above two kinds of circuit wiring is simple, no need to debug, ready to install, interested friends may wish to try.