Brief NTC thermistor voltage divider circuit

Voltage dividers can easily be made with a thermistor and fixed resistor.

Brief circuit schematics with short video – List of pages

Thermistor schematic symbol diagram by electronzap electronzapdotcom
Thermistor schematic symbol diagram by electronzap electronzapdotcom

Amazon affiliate link ad. These appear to be like the one I have from a kit.

More heat leads to a lower resistance for a NTC thermistor (higher resistance for a PTC thermistor). So the voltage divider output voltage will drift more towards the side of the supply that the NTC thermistor is connected to.

Circuit diagram:

Thernistor voltage divider demonstration circuit diagram by electronzap electronzapdotcom
Thernistor voltage divider demonstration circuit diagram by electronzap electronzapdotcom

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I simply use this circuit to touch the NTC thermistor to a heated resistor or to separate them. Any heated/cooled item can be used in place of the lone resistor.

My NTC thermistor is close to 10KΩ at room temperature. So dividing the supply voltage with a 10K resistor gives about half supply voltage at room temperature.

Voltage goes up with heat and down with cold in relationship to room temperature in the circuit shown.





Video:

Quick voltage divider using thermistor NTC Negative Temperature Coefficient demonstration circuit

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  • Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.