[ILUG] OT: stepping down from 12v to 9v

[Brian Brazil]

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.

Brian

-- 
Website: http://www.netsoc.tcd.ie/~bbrazil