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I think those might be too small - again try to find the one with the most junctions yet is fairly small. Usually voltage is tied to junction count.
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I think those might be too small - again try to find the one with the most junctions yet is fairly small. Usually voltage is tied to junction count.
Cool sounds good.
BTY what's the differance between TECs and thermopiles? I sent Jerry a PM asking if he had any spare thermopiles. Would those be suitable?
-Tony
in that schematic why isnt R1 conected to anything else? and why are only 2 leads connected on the Pots?
A TEC is a thermoelectric "heat pump" that take the heat from one side and carry it to the other (producing in the process more heat on the "hot" face), made with a lot of silicon junctions connected in serie ..... when you use it "in reverse", for a phisical factor called "seebeck effect", the junctions produces some current when there is a difference of heat from the two sides, and more is the difference, more is the output voltage ..... we use them "in reverse" for make homemade or experimentals LPMs .....
The thermopile is a joint between 2 different metals, that produce current when heated directly, and a "thermopile" measuring head is, normally, made with a disk of adsorbing material, joined with a lot of thermopiles junctions in the back part, all in series, so the output voltage is increased .....
This second element is specifically made for thermal / radiant energy detection, so is, ofcourse, much more efficent and sensitive than a TEC used in reverse, but at the same time, is also much more high cost .....
The laserbee (i suppose that you are referring about that) uses a very good TEC element, maybe not sensitive as a real thermopile, but enough for detect also few mW of power ..... as example, all the TECs that i have around, except maybe the 6x6mm ones, are not sensitive as the one that he use in his product ..... (but i cannot judge the products that can be found in other countries, based on the ones that i can find here ..... here in Italy the distribution system is so crap, that sometimes i have difficults in finding the 40x40mm ones )
Quick Parts check:
I have a 10mm X 10mm TEC,
and I have one 741 Op amp package.
This won't mess with the resistance values... correct?
Thanks,
-Tyler
Sorry, in what sense ?
Also, 741 require a double power supply, if you want to use it in a stable and good configuration ..... and is a single op-amp, so the pins are different .....