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This device is a tiny SMD thermogenerator that harvests heat energy to generate up to 10 milliwatts of power. Dev boards are available at Mouser for a mere $700 retail.
In case of Micropelt devices, one side is placed near the heat source and the other side has a fixed heat-sink on top of it.
The top part, as seen in the picture above, is soldered “upside-down” through a hole in a PCB. This is the hot end.
The bottom part, as seen here, is the cool end. It sits over the PCB and requires a heat-sink. Here’s what it looks like implemented.
Via Electronics-Lab.
