A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature.
I need a voltage amplifier for J type thermocouple, can anyone help me?
Hi,
Is this circuit really suitable for thermocouples?
A tyke K thermocouple has about 40uV/K.
But a bjt V-BE will drift with about -2100uV/K.
Therefore the change of 1°C at the bjt will cause an error of about 50°C in thermocouple temperature reading.
If its for accurate measurement and readout display, use a proper thermocouple amplifier chip from Maxim or Analog Devices.
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