Re: I need electronics help, providing a 9v source from a 12v...

On 9/13/05, Flash. <thefirebuilds@gmail.com> wrote:
>
> If i have a 12volt system like in a car or a large motorcycle and want
> to power a 9volt DC radio whats the easiest way to make the
> transition?

<snip>

LM7809 with a heatsink is easy, it will require a little project box and
soldering. There is a circuit
here,<http://www.uoguelph.ca/%7Eantoon/circ/car912.htm>but it is a
little fancier, and uses a Zener instead of a plain LM78xx
(you'll still need to heatsink a Zener, unless this is only a few milliamps
you want to draw).

You may be able to get a 12vdc to 9 vdc adapter at Walmart or
online.<http://www.google.com/search?hs=KtB&hl=en&lr=&client=firefox-a&rls=or
g.mozilla%3Aen-US%3Aofficial&q=%2B%2212vdc+to+9vdc+adapter%22&btnG=Search>The
re
is a good background
here. <http://www.rc-cam.com/dc-dc.htm>

hope this helps,
scott