High-Temperature thermometer - any ideas?
I've got one of those convection ovens at home where you rotate the dial to set the temperature. Well, the dial has become loose and the markings are fading away. I could easily buy a replacement dial (or ... a whole new oven for that matter) and not have all my cakes come out as charcoal :D
But why take the easy route when I can design a digital thermometer, right? I was thinking of using a k-type thermocouple, an amplifier IC, a PIC and a 3-digit 7-segment LED module. I need to measure upto 450F. I can easily find the last two components, but searching for a low-noise amplifier (since the k-type's temp coefficient is only about 41 uV/ deg. C) and an inexpensive k-type thermocouple has not proven fruitful so far. I don't want to use those expensive ICs specially built for the k-type thermocouples (where's the fun in that?).
Any idea which low-noise voltage amplifier ICs I can look at and more importantly, any idea where I can buy those k-type thermocouples for less than $10 (if at all possible)? Thanks in advance for any help.
