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DC voltage regulator


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12V - 5V= 7V. 7V x 700mA= 4.9W. A fairly small heatsink is needed with a TO-220 package for only 4.9W. When the car is running then its votage could be 14.4V. Then the regulator will dissipate 6.6W. The heatsink can be much smaller if you don't use an insulator. Then insulate the heatsink from ground.
Use the TO-3 regulator if you can find a heatsink small enough.

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