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Temperature to Voltage Converter Circuit

Last Updated on January 8, 2024 by Swagatam Leave a Comment

In this post I have explained a simple temperature to voltage converter circuit using IC LM317. The idea was requested by one of the dedicated members of this blog.

Table of Contents
  • Technical Specifications
  • The Design

Technical Specifications

I have eurotherm TS200A temperature controller.this is thyrister based.

This required 0-5V control voltage. I want one temperature control circuit when temperature is 25deg C the voltage is 0V. Temperature reduces the control voltage increase from 0-5V.

Please provide the circuit diagram.

Thank you.

The Design

A simple layout for the proposed temperature to voltage converter circuit can be seen in the following diagram.

warning message: electricity is dangerous, proceed with caution
temperaturetovoltageconvertercircuit 1

LM334 which is a precision temperature sensor chip is configured with another precision voltage regulator IC LM317 circuit forming an accurate, linear temperature to voltage converter circuit.

The gain pot and R2 may be tweaked and experimented for achieving the desired temperature to voltage ratio.

As per the request, the voltage needs to be 0 at 25 degree C, this may be done by creating an atmosphere at the specified temperature and then adjust the pot to get a 0V at the output.

The above adjustment would hopefully allow the output to produce 1V increment for every 4.16 degree decrease in the temperature around LM334, this may also need some tweaking.

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Filed Under: Temperature Controllers Tagged With: Converter, Temperature, Voltage

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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