A number of thermoelectric (or thermal-electric) devices readily are available for your designs. They fall into two categories. First, there are cooling devices; often used for fiber-optic modules or stabilized oscillators. These use the Peltier effect to cool things via energy being put into the unit. For this article we are interested in the opposite - modules that make use of the Seebeck effect, where electricity is generated across two plates due to their temperature differences. These devices have great potential for energy savings and for powering portable wireless IoT devices.
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