Fwd: should I DIY this thermocouple?

[Darcy Whyte]

http://mambohead.com/2011/12/thermal-thinking/ 

It's 216.00 CDN. 

I think it could be fun but does anybody know what materials and how to construct?

[Tim Dierks]

It uses a peltier junction. Take a look at the similar generator in Make 15: http://makezine.com/15/seebeck/ (I haven't read this, but found the link.)

Something like this should work, as well: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=320-253 ; the description talks about running it the other way (using electricity to pump heat), but it should work both ways (using heat differential to generate electricity).

Efficiency of these junctions is low; there's a reason that this science kit has a very low-load demo (spin a DC motor with a little fan).

 - Tim

[Chris Clearfield]

Airplane engine probes (and I'm sure many other things) use
thermocouple welded junctions and get pretty tight response
(http://www.to-avionics.com/insight/gemguide.html)

See:
http://www.aircraftspruce.com/menus/in/probesandsenders_egt.html. Much
less than 216 CDN.

Very small voltages generated and it seems like they're pretty precise.
--
C

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Chris Clearfield