Refrigerator temperature controller. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers
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The temperature controller of the refrigerator allows you to change the temperature and save energy when using absorption refrigerators that do not have automatic switches ("Morozko", "Ukraine", "Kristall", etc.).
The circuit is a multivibrator that periodically turns off the refrigerator using a relay. The multivibrator is made on transistors V1 and V2 of the MP40-MP42 type with Pst = 80. The time interval for switching the multivibrator is 50 s. With the help of a variable resistor R3, the ratio of the time the refrigerator is on and off is regulated, and hence the temperature inside it. The refrigerator is turned on using a relay, the winding of which is connected to the collector of transistor V2. A spark-extinguishing circuit consisting of resistor R5 and capacitor C4 is connected to the relay contacts. To eliminate the vibration of the relay contacts, a capacitor C3 is connected in parallel with its winding.
Details. Lamp H1 type MH-3, H2 type MH 15, 26 V x 0,16 A; the transformer is made on the USh-12 x 17 core; the primary winding of the transformer contains 5200 turns of PEL-0,08 wire, the secondary - 1060 turns of PEL-0,16 wire.
Author: N.Efimov
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