[ARC5] If You Need a Regulated Low B+ Supply

[Dennis Monticelli]

While the diagram says "new" this part and the associated circuit dates to
1991 when it went into the early GM airbags.  I know because my work group
designed it.  However, it is still sold along with a plethora of other
"Simple Switchers" which have gone through five generations now.  If you go
to the National Semiconductor website you will a cluster of easy-to-use
design tools that allow virtually anyone to design the switching reg they
need right on-line.  All the popular configurations are covered.  You can
then order the components along with the PCB from the distributor link or
just roll your own by buying the chip from DigiKey.

BTW, you can still stack "common-ground" DC/DC converters by feeding them
raw DC from independent windings on the transformer.

Remember that most switcher circuits are not designed to have low enough EMI
to guarantee happiness in our radios.  Pay close attention to short lead
dress, good grounding and use shielded inductors vs the cheap solenoid
types.  For best results, extra input & output filtering and a metal box may
be needed.


Dennis AE6C

On Sat, Feb 13, 2010 at 11:50 AM, David Stinson <arc5 at ix.netcom.com> wrote:

> This cute little circuit is an example of the kind of DC/DC
> converter you cannot stack, since in and out have a
> common ground:
>
> http://www.nbglin.com/dc.htm
>
> Still a neat circuit, though.  I'm gonna get me a
> couple to use as "Borg Implants."
>
> 73 Dave S.
>
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