The PIC single chip machine control burglarproof alarm circuit

Published:2011/7/6 4:30:00 Author:qqtang | Keyword: single chip machine, burglarproof alarm | From:SeekIC

ＶＤ５０２６, Ｔ４ and so on in Figure 1 compose the remote control emitting unit. One line of the 12V power supply is directly provided for the high-frequency emitting circuit, the other line gets a 5V or so voltage after the distribution of Ｄ１０ and Ｒ２４～Ｒ２７ when the keys of K1~K4 are pressed, and the voltage is then offered to VD5026 by D6~D9. When one of the emitting keys K1~K2 is pressed, the pin is outputting the encoding pulse bundle, which is launched by T4 after modulation(the frequency of the high-frequency oscillator composed of T4 is about 180MHz).



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