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While the 7805 is the default choice for a clean 5V rail, plenty of components, especially relays, cooling fans, and some sensor modules, run natively on 12V instead. The LM7812 fills that role with the same simple three-terminal wiring as its 5V sibling: feed it an input voltage a few volts above 12V, and it outputs a steady, regulated 12V with minimal external parts needed beyond basic input and output filtering capacitors. It is a common choice for powering a 12V relay bank, a 12V cooling fan, or a 12V sensor module from a higher-voltage battery or adapter without needing a more complex switching regulator design.
| Brand | Generic |
|---|---|
| Output | Fixed 12V |
| Selling unit | PCS |