Music type refrigerator door closing reminder circuit

Published:2011/5/16 8:40:00 Author:Christina | Keyword: Music type, refrigerator, door closing, reminder | From:SeekIC

The Music type refrigerator door closing reminder circuit is as shown. This circuit is composed of the step-down rectifier voltage-stabilizing circuit, the delay circuit, the music IC CIC2851E, the speaker.etc. The step-down rectifier voltage-stabilizing circuit supplies the 3V DC voltage to the whole circuit. When you open the door of fridge, switch AN connects. and the capacitor C3 is charged through R3, BG1's base potential rises, after about 20 minutes delay, C3's voltage makes BG1 conduction, and makes the BG2 cut-off, and this voltage triggers the CIC2851E to work, the output music signal is amplified by BG3 and drives the speaker Y to send out the music of ling er xiang ding dang.... to remind the master to close the door quickly.



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