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Thermocouple amplifire circuit

Started by Amod, Feb 22, 2021, 01:50 PM

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Amod

I need a thermocouple amplifire circuit using OP07 ic with cold junction compensation.

keytapper

I would recommend you to use a PT100, so the internal ADC will be able to deal with.
Unfortunately these resistor are costlier than the usual thermocouple. If you want to spare for the PT100, then you may look the MAXIM ADC to get a linear sampling.
IMHO the thermocouple has a slow response to variations.
Ignorance comes with a cost

Amod

Actually sir, temperature goes upto 1000 degrees. So i think thermocouple is better than PT 100 and it's low cost also.

See_Mos

just search the internet for 'thermocouple amplifier circuit' there are many out there.

Have a look at Linear Technology application note AN28

joesaliba

I used the MAX31855 with a K-type thermocouple.

ken_k

To me the MAX31855 would be the path of least resistance.

okmn


keytapper

@okaman
Great finding, I see Fig. 3 has a viable solution for MCU. The source may need some fiddling to convert in basic.
Ignorance comes with a cost

See_Mos

I have to agree with Ken, and the MAX31855 boards are so cheap from China.