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Overtemperature alarm circuit three
Source: InternetPublisher:张三叔 Keywords: Alarm circuit BSP transistor Updated: 2020/01/28
It uses the negative temperature system thermistor Rt as the temperature sensing element , uses the operational amplifier A as
the over-temperature detection element , and drives the speaker B to emit an alarm sound through the triode
VT power amplifier.
In the figure, VDi, VDz, and VDa are clamping diodes to protect the operational amplifier A and the transistor VT.
Adjusting the potentiometer RPi can change the set temperature; adjusting RPz can change the sensitivity of the device.
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