Message text written by Brian Borgstede
>I have been running one for over ten years now.
I had a model railroad buddy help me make it.
The problem is that I can't remember how!
It's a circuit that he used to run HO trains.
It uses a 12V variable voltage regulator pot,
and maybe a resistor and a cap (he was always
big on a clean output). I remember that we built
the unit and set the output to 10V. I didn't like
what the gauges were telling me, so I turned
the adjusting pot until they looked right.
I'm real sorry that I can't remember what
parts and how they went together. I remember
an input, output and a ground. The ground
is important, just like the original.
<
The most common part to use in this application is the
LM317T. An adjustable, 1.5 amp, three terminal regulator
in a TO220 power tab package. That and a pot and a couple
resistors and caps and away you go.
Try: www.nationalsemiconductor.com and do a search
on LM317. It should point you to the data sheet that will
include some application examples.
Have fun
Dave
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