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二、热释电人体红外传感器的应用 图4为PZ288或SCA02—1的放大检测电路。 PY1为传感器PZ288或SCA02—1,IC1选用低噪音高速运算放大器。PY1检测到人体红外信号时,②脚输出极微弱的电信号直接送到IC1a放大器的同相输入端,IC1a对信号放大约2500倍后,再从①脚输出,由电容C8耦合到IC1b作进一步放大。IC2构成窗口式电压比较器,当IC1b⑦脚电压幅度在U_A和U_B之间时,IC2①⑦脚均无输出;当IC1b⑦脚电压大于U_B时,IC2a⑦脚输出高电平,IC1b⑦脚电压小于U_A时IC2b①脚输出高电平,经D1D2相互隔离和“或”的作用从P
Second, pyroelectric infrared sensor applications Figure 4 for the PZ288 or SCA02-1 amplification detection circuit. PY1 sensor PZ288 or SCA02-1, IC1 use low-noise high-speed op amp. PY1 detect the human body infrared signal, ② pin output very weak electrical signal sent directly to the IC1a amplifier non-inverting input, IC1a about 2500 times the signal amplification, and then from the foot output by the coupling capacitor C8 to IC1b for further amplification . When IC1b ⑦ pin voltage is greater than U_B, IC2a ⑦ pin output high, IC1b ⑦ pin voltage is less than U_A IC2b ① pin when IC1b ⑦ pin voltage is less than U_A Output high, D1D2 mutual isolation and the role of “or” from P