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From: Lizard Blizzard
Subject: Re: V regulator input cap size?
Date: Tue, 22 Oct 2002 08:19:19 -0700
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <firstname.lastname@example.org> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <3DB48CD0.447092BF@rica.net>
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John Popelish wrote:
> DaveC wrote:
>>What to do? I'm using 35vac from an HVAC control-voltage transformer. The
>>transformer is used for standard control circuits in the HVAC unit on the
>>roof, so I can't change the transformer.
>>Short of getting a 35v/20v transformer (or such unavailable combination), any
>>suggestions how I can make this voltage useable for my 12vdc circuit?
>>Two-diode rectification? Single diode?
> With this ratio of voltage reduction, I would consider a buck
> switching regulator, unless you have some reason why that would not be
> You might also consider a prefab DC to DC converter if cost is not so
> important. It could run off the rectified and filtered 35 volts AC.
> For example, for $48, Digikey sells an Artesyn CXA10-48S12 rated for
> 18 to 75 volts in and 12 volts @ .83 amps out. This also provides
> isolation between the 35 volt transformer and the 12 volt output.
Which reminds me:
----------------(from OED Mini-Dictionary)-----------------
PUNCTUATION - Apostrophe
Incorrect uses: (i) the apostrophe must not be used with a plural
where there is no possessive sense, as in ~tea's are served here~;
(ii) there is no such word as ~her's, our's, their's, your's~.
Confusions: it's = it is or it has (not 'belonging to it'); correct
uses are ~it's here~ (= it is here); ~it's gone~ (= it has gone);
but ~the dog wagged its tail~ (no apostrophe).
----------------(For the Apostrophe challenged)----------------
From a fully deputized officer of the Apostrophe Police!
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