Save fuel bills and the economy of the planet with this circuit. SW1 is a normally open press button switch which allows you to view the level of hot water in a hot water tank. When pressed the voltage difference at the junction of the thermistor and preset is compared to the fixed voltage on the op-amps non-inverting input. Depending on the heat of the water in the tank, the thermistors resistance will toggle the op-amp output to swing to almost full voltage supply and light the appropriate LED.

Bridge circuit contains two resistors lOO-ohm (R3 and R4), and two thermistors (Tl and T2). At room temperature, the resistance of T1 and 1'2 is about 2000 ohms. When they are each heated to 150 ° C by an RNA 10 current, the resistance value decreases to 100 ohms. So. the four elements include a bridge circuit. CO is a characteristic that conducts heat from a thermistor at a rate different from that of air. A thermistor, TI, is exposed to automobile exhaust, while the other, 1'2, is isolated in an environment of clean air. Unlike thermal conduction bridge imbalance. A voltage difference is caused between points A and C. A differential amplifier. VI, amplifies this difference and leads to the counter with a current sufficient to read the percentage of CO and air-fuel ratio. A control panel before the balance, R5, balances the bridge and calibrates the instrument. The calibration is performed when both thermistors are exposed to outside air.

This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is replaced by the thermistors. When the temperature is increasing the resistance of NTC thermis

The picutre 3-6 is thermistor temperature or frequency conversion circuit. Because thermistors resistance changes with the temperature in linear way, the change can be used in voltage controlled oscillator. In the circuit, A1-A4 uses current type operational amplifier LM390O, RP1 and RP2 are used to adjust thermistors temperature-resistance properties

This two-part article describes how to use a simple voltage divider circuit with a thermistor to achieve high-accuracy temperature readings over broad measurement ranges. Part one discusses the circuit and various temperature estimation methods..

Channel 7 has a circuit diagram of a smart temperature sensor MAX6698 is shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (

Circuit shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (RT1 ~ RT3). The internal reference voltage source via a resistor