Introduction to thermistor: Thermistor is a solid-state component. This circuit uses a thermistor with a negative temperature coefficient. When the temperature rises, the resistance decreases. The name \"thermistor\" is derived from \"heat\" and \"resistance\". In the circuit, a decrease in resistance also means an increase in current. Thermistors are very sensitive. The most sensitive ones are about 5% lower in resistance for every degree of temperature increase. Thermistors are made of metal oxide crystals using a sintering process. As shown in this circuit diagram, the output corresponding to the temperature range of 0° to 50°C is 0 to 1V. VR1 can be used to perform offset adjustment, and full-scale adjustment can be performed. If an OP amplifier with a smaller offset voltage is selected, VR1 can be replaced by a fixed resistor. Its output characteristics are listed in Table 1. The temperature-resistance relationship between the zero point, the center point and the maximum value forms a nonlinear characteristic curve. If the temperature range to be measured is narrow, a linear amplification and re-detection method can be used. However, if the measurement range is very large and a more accurate value is desired, it is best to use a microprocessor system to store the above characteristic relationships in a ROM and generate the intermediate points by interpolation.
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