Pyroelectric infrared detection burglar alarm in simulation technology.Human Body Sensor Vendor

　　When the pyroelectric infrared sensor does not detect the infrared signal of the human body, the 2-pin output of the IC is low, the transistor V does not conduct, the relay K does not pull, and the alarm HA does not work. When people enter the pyroelectric infrared sensor alarm detection area, to accept the human body infrared sensor signals and transform it into electrical signals, input from IC 11 foot, after circuit inside the IC processing, from 2 feet high output control level, make the V conduction, K absorption, the normally open contacts will alarm HA electricity work, HA a loud alarm.

　　IC 6 pin external optical control circuit. During the day, photosensitive resistor RG by light irradiation is a low resistance state, so that the 6 foot of the IC is low level, IC is forbidden to output state, its 2 feet no control voltage output, HA alarm does not work; At night, the resistance of RG increases, IC and alarm work normally. If you want to make the IC and alarm work all day, you can remove the RG and R6.

　　IC 7 pin external work mode selector switch S2. When S2 is placed in the "ON" position, the 2 pins of IC are always the effective output; When S2 is placed in the "OFF" position, the 2 pins of IC have no output; When S2 is placed in the "AUTO" position, IC is in the automatic working state, and the output of its two pins is controlled by the signal of pyroelectric infrared sensor.

　　IC 3 feet for delay oscillator input, 4 feet oscillator (time) for system input, 5 feet of ac zero crossing detection side, 9 feet for reference voltage output for PIR (power supply), 10 feet to reset end (low level) effectively, 11 feet of positive phase input 1, 12 feet of inverting input 1, 13 feet for output 1, 14 feet for positive phase input 2, Pin 15 is the inverting input terminal 2 and pin 16 is the output terminal 2.

　　Adjusting the resistance value of R7 can delay the frequency of the oscillator, so as to change the length of the output timing time.

　　The sensitivity of pyroelectric infrared sensor can be changed by adjusting the resistance value of R9.

　　Selection of components

　　R1 adopts 2W metal film resistor; R2~R6, R8, R10~R12 use 1/4W carbon film resistor or metal film resistor; R7 and R9 use small organic solid variable resistors.

　　C1 choose polyester capacitor or CBB capacitor with voltage value of 630V; C2 adopts aluminum electrolytic capacitor with voltage resistance value of 25V; C3, plant C4, C7, C1O and C12 are all selected with 16V aluminum electrolytic capacitors; C5 and C6 use high-frequency porcelain dielectric vessels; C8, C9 and C11 are made of single stone capacitors or polyester capacitors.

　　VD1~VD5 are selected 1N4001 or 1N4007 type silicon rectifier diodes.

　　VS1 and VS2 are 1W and 12V silicon voltage regulator diodes; Duck VS3 selected 1/12W; 9V silicon voltage regulator diode.

　　V selection of S8050 or C8050, 3DG8050 silicon NPN transistor.

　　SD622 or P228 pyroelectric infrared sensor is selected for PIR, and Fresnel lens should be used.

　　K uses 12V DC relay.

　　S1 Single-pole power switch with contact current of 1OA is selected; S2 adopts the single-pole three-position (single-pole three-throw) toggle switch.

　　HA selects a high loudness alarm speaker with its own audio source.

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