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I've bought a 3A 12x2v tramsformer. . from half m getting about 18v output. applying bridge rectifier i filtererd into DC. But my problem is using LM7812 or LM7809 it gets extremly hot although i've used heatsink... so my question is 1. What can I do to avoid overheating ?2. How can I use this 3A transformer as 1 or 1.5 A if i need?
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