3 terminal device that outputs a certain voltage (5V for the 7805) as long as the input voltage is at least about 2V higher than the output voltage. The 78 indicates that it is for a positive supply in relationship to ground, and the following 2 digit indicates the voltage that it outputs.
All limitations of components should be checked with the datasheet. Here’s a handful of important ones, and is not guaranteed to be accurate.
- Max supply voltage: 35V
- Max current: 1.5A. Would need a good heat sink
- Internal power dissipation: Internally limited (reduces output current as needed to prevent overheating.
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- Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.