uclaros Posted April 22, 2004 Report Share Posted April 22, 2004 Hi all (ones with more electronics knowlege than me!)I want to build a car charger for a friend's mp3 player.It says it need 5v (I think about 400-500 ma).Is it OK if I just use a 7805 directly from the car's lighter-outlet or are there any dangers I should consider? maybe i need some filter caps?any advice is welcome!Thanks , uclaros Quote Link to comment Share on other sites More sharing options...
pay_c Posted April 22, 2004 Report Share Posted April 22, 2004 Yeah, definitely with filter caps. A recitifer is not needed (it´s really hard to change the polarity there).Just use the schematic of the core or so.Easy one! Just *do* use a heatsink! 12V to 5V @ 500 mA are appr. 3 Watts heat! That´s really much for such a little 78xx.Greets! Quote Link to comment Share on other sites More sharing options...
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