Hazardous area alarm circuit diagram 2

Published:2011/6/2 3:49:00 Author:Lucas | Keyword: Hazardous area, alarm | From:SeekIC

The hazardous area alarm circuit is composed of the pyroelectric infrared sensor (PIR), signal processing circuit and the language remind circuit, and the circuit is shown as the chart. Signal processing circuit is composed of the pyroelectric infrared signal processing integrated circuit IC1 and resistors R4 ~ R12, capacitors C4 ~ C12. The language remind circuit is composed of the speech integrated circuit IC2, transistors V1 and V2, resistor R13, capacitor C13 and speaker BL. R1 ~ R13 use 1/4W carbon film resistors. C1, C2, C4, C6 and C8 ~ C12 use polyester capacitors or monolithic capacitors; C3, C5, CT, C13 select aluminum electrolytic capacitors with the voltage in 10V. V1 selects 59013 NPN silicon transistor; V2 uses 58050 silicon NPN transistor. BL uses 0.25 ~ 0.5W, 8Ω electric speaker.



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