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Components are the most basic elements in an electronic circuit. Characteristic is that they're in a single package. There are passive and active components, from as simple as a zero-ohm resistor to as complex as a multi-billion transistor IC.

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What is this component from an old thermostat?

I recently cannibalized an old thermostat for parts, and found a strange looking component with no markings at all. Here's a picture (since I can't figure out how to describe it): My first guess w …
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