CIC2851E refrigerator closed remind schematic

Posted on Mar 28, 2007

CIC2851E refrigerator closed circuit principle reminders The circuit consists of step-down regulator rectifier circuit, the delay circuit, music IC CIC2851E, speakers and other

CIC2851E refrigerator closed remind schematic
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components. Where the buck regulator circuit for the entire rectifier circuit provides DC voltage of about 3V. When you open the refrigerator door, AN switch is turned on, the capacitor C3 is charged by R3, as charging progresses, BG1 base potential rise, about 20 minutes after the delay, so that the voltage on C3 conduction BG1, BG2 deadline, respective trigger CIC2851E work, the output of the music signal after amplification BG3 Y drive a speaker issued a bell sound bite whistle. music to remind the owner quickly closed. Refrigerator door is not closed, the sound of music more than. The length of delay time can be selected according to the access to food, generally between 5 to 15 seconds. This circuit takes 20 seconds. DW required voltage across the circuit is approximately 3V, if too high, easy to damage the integrated circuit. Resistor R6 to adjust the speed of the rhythm of the music, which ranges from 20k R6 120k .

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