music-type fridge door-close reminding circuit composed of CIC2851E

Published:2011/4/26 21:47:00 Author:TaoXi | Keyword: music-type, fridge door-close reminding | From:SeekIC

The music-type fridge door-close reminding circuit is as shown. This circuit is composed of the rectifier voltage regulator circuit, delay circuit, music IC CIC2851E and the speaker.etc. The reduce-rectify voltage circuit supplies the 3V power to the whole circuit. When you open the refrigerator door, switch AN turn on, capacitor C3 charged by the R3 and the base potential of the BG1 increase, after 20 minutes, voltage of C3 makes the BG1 turned on, so BG2 turns off, CIC2851E starts working, the output music signal is amplified by BG3 to drive the speaker Y send out the music of christmas. If the fridge door does not close, the music will not stop. The length of delay time can be selected by master, generally between 5 to 15 seconds. This circuit takes 20 seconds. The circuit requires the voltage between two ends of DW is about 3V, if the voltage is too high, it is easy to damage the integrated circuits. Resistor R6 is used to adjust the speed of music rhythm, the range of R6 is 20kΩ ≤ R6 ≤ 120kΩ.



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