Be careful about the heatsink, though. The heatsink tab on an adjustable
voltage regulator is usually NOT ground, so you don't want to let either the
heatsink or the mounting tab make electrical contact with the vehicle ground.
Yes, there are usually wiring instuctions in/on the RadioShack package.
You may want to use a fixed regualtor, rather than an adjustable, though.
- The fixed regulators generally wil pass more current.
- The most common fixed voltage regulator, the heatsink tab IS ground, so
you have one fewer issue.
An LM7809 (9 volt fixed regulator) will give you 9 volts at 1.5 amps output
forever, regardless of whether the input voltage is 12, 13.8 or 14 volts.
That and a couple of small filter caps (one on the input side, one on the
output) and you're done.
Chris K.
On Tue, 13 Sep 2005 08:52:42 -0600, de Brebisson, Cyrille (Calculator
Division) wrote
> Hello,
>
> Voltage regulator is good, but you usually needs to heatsink it....
> Normally, it is easy to connect, the mid leg to the ground and the left
> pin to the 12V and your get 9V on the right pin...
>
> Regards, cyrille
>
> Subject: I need electronics help, providing a 9v source from a 12v...
>
> 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?
> I see I can get a voltage regulator that is adjustable, but im not
> exactly sure how to wire it for the proper output. What's the best way
> to do this?
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