![]() You don't mention what current is required, or what the application is so it is hard to recommend what to use. Going from 48 to 12 with a linear regulator means that 75% of your power is being wasted. ![]() ![]() Just getting a modest current flow is gonna turn the regulator and pre-regulator into heaters. The next is (as hgmjr said) power dissapation. The 1st is that the Maximum specified input voltage is 35 volts for a LM7812, and 40volts for the 7824 (24 volt version) so you would need a Pre-regulator, or some method to drop the input voltage down to a safe value for the regulator to operate at.
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