/diy/ - Do It Yourself

>>1275319
You're most welcome, anon.
>>1275395
The monolithic thermocouple amps are probably more accurate than a hand-built circuit would be, especially over temperature. Discrete thermocouple amps require attention to temperature coefficients of various component parameters and tight-tolerance components.
The MAX6675 etc. simulate the reference junction by reading the Vf of an on-chip diode. If you keep the thermocouple connector and the chip the same temperature, you'll be fine. Be careful of copper conducting heat from the power side of your device to the sensing side, etc.
Thermocouple curves don't vary noticeably from sensor to sensor. There isn't much to calibrate if the factory-trimmed ±5degC and 0.5% out-of-the-box accuracy of the device is enough for you. Otherwise, just add an offset to the received value.