Warning device Refrigerator door open. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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It is not difficult and inexpensive to equip a home refrigerator with an "open door" signaling device that notifies of a loosely closed door. For this device, you need only 2-3 photodiodes of the FD-320 type or the like, connected in series:
The signaling device is mounted on a removable ceiling lamp for internal lighting of the refrigerator chamber, which is switched on automatically when the door is opened. Photodiodes are glued with Moment glue on the inside of the ceiling at the location of the lighting bulb. Connection of photodiodes serial. The power leads are soldered with a thin mounting wire and fixed on the ceiling with hot glue. A disk (clock) battery is removed from the "musical postcard", it is no longer needed, its role is played by photodiodes. The wires from the photodiodes are soldered to the released contacts, plus and minus, respectively.
The musical card is also fixed with glue on the surface of the ceiling. The finished ceiling (see Fig. 2) is installed in place, now when the refrigerator door is opened, a pleasant melody will be heard at the same time as the backlight lamp lights up. Since the refrigerator is opened for a short time, the device also sounds for the same amount of time. If the refrigerator door is not closed tightly, the sound continues.
The monotonous sound soon gets bored, like the sound of an alarm clock in the morning, so you can use it as an alternative sound single chip digital voice recorder, you only have to refine the circuit and find a power source, but the reward will be the sound of your favorite phrase.
Author: I.V. Ankudinov: aiv55 [dog] mail.ru; Publication: cxem.net
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