Paul
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Paul @BG455322435 goodto know! just getting in to hand engraving and will need to keep my tools sharp. I think I'd try flattening the stones on my surface plate by hand, however.

siekier 02/03/2020
Whetstone is worthless. The grinding surface is not flat. From 400 grit side its concave and form 1000 grit side its convex. Sharpening a knife its impossible on this whetstone.
400/1000 + 3000/8000 / 400/1000 Grit Πρεμιέρα Πετρα ψηλής ποιότητας Κοπή Ακονιστική Πέτρα Ακουστική Stone Cutter Sharpener
400/1000 + 3000/8000 / 400/1000 Grit Πρεμιέρα Πετρα ψηλής ποιότητας Κοπή Ακονιστική Πέτρα Ακουστική Stone Cutter Sharpener
US$18.39 US$29.00
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Paul you Can, but why would you? considering the power requirements of a cellphone (5v @1amp hour) the cost of components if pretty high. You'd be more economical to use wind or make a steam turbine to produce electricity. efficiency for those systems is on the order of 25-30% compared to 5-8% supplied by TEG modules. think of cost per sq. meter or cost per watt. if only size is your consideration, a pocket sized Peltier system for USB charging would cost more than 20 Euros/ $35 USD

Steen 22/06/2018
The Scandinavian winter is dark. With this thermoelectric generator, I can build a hot water powered charger for both GPS and our mobile phones when we are hunting or fishing far away from a wall outlet.
Ενότητα παραγωγής θερμοηλεκτρικής ενέργειας Peltier TEG 40x40mm,υψηλή θερμοκρασία 150 βαθμούς
Ενότητα παραγωγής θερμοηλεκτρικής ενέργειας Peltier TEG 40x40mm,υψηλή θερμοκρασία 150 βαθμούς
US$6.89 US$11.99
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Paul I can SEE 2 contacts, however I do not see an O-ring, tho others have shown it. what ohms is the resistor?

dark_rider 21/12/2017
Simple steel push button, NO contacts, led light, rubber O-ring to secure button.
Μεταλλικός διακόπτης τύπου πάτημα στιγμής 12V 4 Pin LED Στεγανός
Μεταλλικός διακόπτης τύπου πάτημα στιγμής 12V 4 Pin LED Στεγανός
US$6.89 US$11.99
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