Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Steve Greenfield <alienrelics@...> writes:

> AD595AQ Thermocouple amplifier, laser trimmed to match K type but can be recalibrated for other thermocouples. 10mV/C
> <http://www.analog.com/en/temperature-sensing-and-thermal-management/digital-temperature-sensors/ad595/products/product.html>
>
> $11.76 each from Digikey.

Alternatively, MAX6675ISA+ thermocouple to SPI chip, also K, $14 at
digikey. Outputs absolute degrees C (has its own internal cold
junction compensator). I used one of these to convert my laminator to
digital, the hookup was trivial as was talking to it.

A few extra dollars for the convenience seemed to be worth it, no need
to add any analog parts or rely on an MCU's internal ADC.

http://datasheets.maxim-ic.com/en/ds/MAX6675.pdf

Runs on 3.3v or 5v too.

> Sparkfun article on using it

I went with SF's article on hotplate reflow, seems to work for me as
long as I can keep my boards flat enough to get even contact.