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One of the over-temperature alarm circuits
Source: InternetPublisher:奥特man123 Keywords: Alarm circuit BSP transistor Updated: 2020/03/19
It uses a thermistor Rt with a negative temperature coefficient as the temperature sensing element. It consists of resistors Ri, Rs,
, potentiometer RP and thermistor R. It forms a temperature measurement bridge; a differential amplifier is composed of transistors
VTi and VT2;
an output circuit is composed of transistors VTs and diode VD; an audio oscillator is composed of transistors VT4, VTs and capacitor C.
Adjust the potentiometer RP to change the temperature set value.
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