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本电路采用晶体管作温度传感元件,当被测温度超过某一极限值时,它能产生声光报警。工作原理:该电路由温度传感器、差动放大器、电压比较器和声光指示电路组成。将BG_1的基极、集电极连在一起构成温度传感器。IC_1向BG_1提供不受温度影响的恒定电流,从而使BG_1基—射结电压与温度呈负温度系数关系(约-2 mV/℃)。IC_2由a、b、c、d四个运算放大器构成,其中a、b、c构成高
The circuit uses transistors for temperature sensing components, when the measured temperature exceeds a certain limit, it can produce sound and light alarm. Working principle: The circuit consists of temperature sensor, differential amplifier, voltage comparator and sound and light indicating circuit. BG_1 base, collector connected together to form a temperature sensor. IC_1 supplies BG_1 with a constant current that is unaffected by temperature, resulting in a negative temperature coefficient (about -2 mV / ° C) for the BG_1-emitter junction voltage and temperature. IC_2 by a, b, c, d four operational amplifier, which a, b, c constitute a high