The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
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> <email@example.com> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <3DB48CD0.447092BF@rica.net>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826
X-Accept-Language: en-us, en
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!
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup