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Frost alarm circuit diagram 1

2014-11-19 21:51  
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Frost alarm circuit diagram 1
The frost alarm circuit is composed of the frost detection circuit and the sound and light alarm circuit, and it is shown in Figure 1. Frost detection circuit consists of the thermistor RT, resistors RI ~ R3, potentiometer RP, capacitor C1 and operational amplifier integrated circuit ICl. Sound and light alarm circuit consists of resistors R4, R5, transistors VI, Y2, alarm indicator HL, audio integrated circuit IC2 and speaker BL. R1 ~ R5 select the l/4W carbon film resistors or metal film resistors. RP uses the synthetic membranes variable resistor.