Electronic thermometer(2)

Published:2011/5/10 21:53:00 Author:Nicole | Keyword: electronic thermometer | From:SeekIC

The temperature measuring range of this electronic thermometer is 0-50℃, the precision is 0.1℃, the measurement results are intuitively displayed by digital display. The working principle of this circuit This electronic thermometer circuit is composed of temperature detection circuit, monostable circuit, digital display drive circuit and power supply circuit, it is shown in the figure 9-133. The temperature detection circuit is made of temperature sensor integrated circuit IC1, resistors R3-R5 and transistor V1. The monostable circuit is composed of resistors R1, R2, capacitors C2, C3 and time base integrated circuit IC2. The digital display drive circuit consists of digital display, counter integrated circuit IC3, decoding drive integrated circuit IC4, resistors R7-R16 and transistors V2-V4. The power supply circut is composed of power supply switch S2, battery GB, filter capacitors C1, C6, current limiting resistor R17 and power supply indicator LED VL. When the power supply switch S2 is turned on, one way of GB's 12V DC voltage is fed to IC2-IC4 by Cl、C6 filter, the other way is current limited and reduced voltage by R17 then to light up VL.



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