Frost alarm circuit diagram 2

Published:2011/8/11 1:22:00 Author:Ecco | Keyword: Frost alarm | From:SeekIC

The frost alarm circuit is composed of the power supply circuit, control circuit and temperature detection alarm circuit, and it is shown in Figure 1. Power supply circuit consists of battery CB, power switch s and electric hot thermometer Q. The alarm circuit consists of the sound integrated circuit IC, resistors R2, R3, transistor V and the speaker BL. RI ~ R3 use the 1/4W metal film resistors or carbon film resistors. C selects the electrolytic capacitor with voltage in 6.3V. V uses the 59013 or CW9561-type audio integrated circuit. BL uses the 0.25W, 8Ω electric loudspeaker.



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