# Temperature to Voltage Converter Circuit

With this simple temperature to voltage converter circuit we can do a precise measurement of the temperature in a room. A NTC resistor or a thermistor is used as a sensor that has a strong temperature dependence.
If the NTC temperature rises then the output voltage rises with 0.5 V per 10C.

Conversion factor depends on the type of thermistor resistance used. If you want to read the temperature directly on an universal measurement device then the value of R9 must be choosed so that the desired sensitivity is achieved (R8 must be equal with R9).
The power supply voltage level is not critical; D1 zener voltage can be between 4.7 V and 8.2 V. The current consumption is about 12 mA.

## Temperature-Voltage Converter Circuit Diagram

##### Related Tutorials

• Akash khanpara

Sir., can you say me the exact theory of this t/v converter circuit..??
I mean working of all resistor,zenor diode,capacitor, thermistor and op-amp in this project…?

• Athira

sir, can yu please this circuit of temperature to voltage converter in detail.?

• ankit

what is p1 10k here

• sandiya

sir please suggest me some good projects using digital IC

• Vasu

Sir, am trying to to make current to voltage converter circuit which is going to be connected to temperature sensor (rosemount 644). This temperature sensor gives output in current but I want the value in voltage. Temperature sensor gives output range in current(mA) 4mA to 20mA. My voltage range is 0 to 2.5 V.
Please find the attached file of the circuit what Ive already tried but not able to get the proper values.

• ahmed

sir please tell me how to calculate v1 and v2 for difference amplifier of this circuit?

• GT

I’ve noticed you used a 10K NTC, in the circuit. How about 100K NTC such as the 104GT-1. Datasheet here: http://www.ghd-repair.co.uk/images/GT-1.pdf

What do mean by “Conversion factor depends on the type of thermistor resistance used” I presume temperature to voltage, if so, what values would you suggest for the above NTC ?

Can the output be displayed on a digital multimeter ?

• Tilahun

sir could you explain the possibilty of any type of heat can be converted in to requred voltage ? if is possible how about temprature from hot gas?

• ajrkuvh

input voltage is 12,output is around 10?right?

• Abhijith

Sir,what will be the maximum possible range of temperature that will be effectively converted to voltage and ensure safety of the circuit

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