On Fri, Apr 28, 2006 at 01:33:27AM +0100, Paul Jakma wrote:
> On Fri, 28 Apr 2006, Brendan Kehoe wrote:
>> >Anyone know of a device already available that would take a 12V DC
> >signal (like comes in a car's 12V adapter) and step it easily down
> >to 9V DC?
>> A transformer?
Transformers only work for AC. For DC they'd just make an electromagnet.
For stepping down DC you could use a voltage regulator, or a voltage
divider composed of two resistors in a ratio of 3:1 ohms. Heat
dissipation should be considered in both cases.
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