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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.

2 votes

Component Symbol identification; Rectangle with large T-shape

Long story short: It's a variable resistor. Mainly used as a preset resistor (e.g. to equalize an DC offset) See Rapidtables as an example and search for "Trimmer Resistor" after maybe 1/3 of the pag …
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