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So I built him a heated rock so he can hangout in a toasty place. It is the simplest circuit I have eve ...it using a metal tin, grout/cement, flag stone fragments for the main pad/rock. Electrically it consists of a single 3kΩ (20W) power resistor I had lyin

...are from different sources. Concentrations differ by location, and rock to rock. All are estimations ** I double insulated all wires with heat shrink tube, tried to keep a space between wires and used polymide/kapton t