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Best resistor to lower my current? Answered

Hi everyone, I recently started to get into electronics and now need some assistance. I have a 12v and I believe 1A of power. The component I'm connecting is 3.7v with a 450ma battery that uses 3W. I using a l78m05cp, I built what should be a 5v .5A psu, but I must have calculated something wrong because fried my component. I believe the current is what I'm not getting right. Using P=IV, I found I should be using .8A, but I really am not sure about it. Please help, I'll go broke if I keep frying things!

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steveastrouk
steveastrouk

7 years ago

You "fried your component", or your component got hot ? They are different things. And unless you bolt your component to a heatsink it WILL get very hot, very quickly, and shut down.

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Josehf Murchison
Josehf Murchison

7 years ago

I hope you mean a LM7805.

Did you build your circuit like this.

Remote C 3a.bmp