Hi all,

Decided to make myself a little project to build a fairly small and efficient self contained iPhone car charger so (12V DC - 5V 500mA DC).

I'm wanting to use a MC34063 DC to DC converter chip in the design for some reason have some lying around.

Anyone willing to help design the schematic - not my strong point.
Thanks
~scol

 

Hi all,

Decided to make myself a little project to build a fairly small and efficient self contained iPhone car charger so (12V DC - 5V 500mA DC).

I'm wanting to use a MC34063 DC to DC converter chip in the design for some reason have some lying around.

Anyone willing to help design the schematic - not my strong point.
Thanks
~scol

http://www.ladyada.net/make/mintyboost/icharge.html

Apple doesn't make it that easy.

 

Play it safe and use an 7805 with a heatsink. They are rugged and with fewer parts, probably more reliable than the simplest 4063 supply.

 

Play it safe and use an 7805 with a heatsink.

I can at least verify that this does work. I've made a couple of them. They get quite hot and probably self-limit the charging current, but mine have lasted for years.

You'll need resistor dividers to apply a voltage onto the USB data lines, to fool the iDevice into accepting a charge. I think the mintyboost project has good details on what values to use.