Resistor Chip Arrays
Product name: thermoluminescent far-infrared anti-theft circuit DIY welding parts
Product model: JS-56-11
Working voltage: DC8~12V
PCB size: 67 * 64mm
Description:
The pyroelectric far-infrared anti-theft device uses the pyroelectric sensor of the human body to detect the signal. When a person is detected, LED1 will light up and delay for a period of time.
ntroduction to working principle:
The pyroelectric far-infrared anti-theft device uses the human pyroelectric sensor to detect the signal, and amplifies the signal through the A part of the triode VT1 and the operational amplifier U1. Part B of the operational amplifier U1 acts as a comparator. VD2, R13 and C6 form a delay circuit, which is delayed by the charging of the capacitor. The comparator U2 is used to output the alarm signal and turn on the alarm indicator LED1. VD3 and the circuit behind it are used to shield the wrong alarm caused by the charging of capacitor C6 when it is powered on (note that the shielding time is long, about 1 minute).
Job description:
After welding and testing, use 8-12V DC power supply. Touch the pyroelectric sensor with your hand, and LED1 will light up. After taking it away, it will delay for a period of time.
The adjustable resistor RP1 is used to change the sensor sensitivity.
Adjusting the adjustable resistor RP2 can change the brightness of LED1. When adjusted to the appropriate value, it can shield the problem that LED1 is lit when powered on.
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Type : Voltage Regulator
Origin : Mainland China