Double-limit temperature alarm circuit 2

Published:2011/11/23 2:07:00 Author:May | Keyword: Double-limit, temperature alarm | From:SeekIC

This double-limit temperature alarm circuit consists of temperature detection circuit control circuit, temperature indicating circuit and sound alarm circuit, as shown in the diagram.Component selection: R1 ~ R5 choose 1/4W carbon film resistor or metal film resistors. RP1 and RP2 chose small organic solid potentiometer. C choses electrolytic capacitors voltage is 10V. VL1 and VL2 are chose high-brightness light-emitting diodes φ3mm, VL1 is red, VL2 is green. VS chooses 1/2W, 3V voltage silicon diodes. V1 and V3 choose S9013 or C8050 silicon NPN transistor; V2 chooses S9015 or C8550 silicon PNP transistors. IC1 chooses TC602 temperature sensor integrated circuit; IC2 chooses S9015 or C8550 type silicon PNP transistor.BL chooses 0.25W, 8Ω micro-electric speaker. S chooses small single pole toggle switch. GB chopses 6V battery stack.



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