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

[J. Forster]

Most commercial DC/DC Converters are isolated, but there are buck and
boost converters that use inductors w/o transformers that are not. It is
quite possible to make say +/- 15 from 6 or 9 VDC w/o any transformers.

-John

==============



> Switching regulators are inherently isolated, unless, they make an effort
> to
> connect the input common to the output common. I have never seen one like
> that, which does not mean they do not exist, HI. 73 - Mike
>
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ 07731
> 732-886-5960
>
>
>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
> Sent: Friday, February 12, 2010 12:43 AM
> To: 'Discussion of AN/ARC-5 military radio equipment.'; 'Old Tube Radios';
> milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
>
> Some folks have asked where I got the converters.
> It was a local surplus house in Carrolton, Texas,
> called "Tanners."  We call it the "candy store."
> Lots of good stuff but, alas, none of these remain in stock.
> You find them often on Ebay.  Check with any local
> surplus houses you know, because these kind of
> DC/DC converters are becoming pretty common.
> You can get them for all kinds of voltages out.
> If you look at some, be sure they have an isolated output
> (i.e the input and output negatives are not common).
> All of them I've seen in surplus are isolated, but some are not.
> One caution:  Many of these can source better than an amp.
> It's easy to look at these little bricks and think of
> safe, cute 12-volt plastic radios, and get careless.
> When you start stacking them,
> they ain't "play-prettys" no more.
> An amp at 300 volts will kill you mos'-very-buncha dead.
> Be careful.
> 73 Dave S.
>
> p.s. I don't know if the case insulation will stand really high voltages,
> since they were designed to never be more than 30 volts above ground.
> I don't allow the cases to contact ground.  Haven't had a problem
> so far at the 90-volt level, but I've stacked them to 300 and
> I think that might be a bit "dicey."  I'm going to stick with 90 to 120
> volts and be happy.
>
>
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