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30V to 12V dc voltage regulator?
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<blockquote data-quote="john" data-source="post: 2746644" data-attributes="member: 5463"><p>It depends on the current you need.</p><p></p><p>Suppose you need 1 amp.</p><p></p><p>The 30V supply produces 30V 1A = 30 watts of power.</p><p></p><p>your circuit takes 12V * 1A = 12W of power. So your regulator needs to "waste" 18 watts.</p><p></p><p>A 7812 generates 5 degrees per watt = 90 degrees! so thats no good.</p><p></p><p>Honestly, it would be better and probably cheaper to get a 12V supply.</p></blockquote><p></p>
[QUOTE="john, post: 2746644, member: 5463"] It depends on the current you need. Suppose you need 1 amp. The 30V supply produces 30V 1A = 30 watts of power. your circuit takes 12V * 1A = 12W of power. So your regulator needs to "waste" 18 watts. A 7812 generates 5 degrees per watt = 90 degrees! so thats no good. Honestly, it would be better and probably cheaper to get a 12V supply. [/QUOTE]
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