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Reply-To: "Dave Dahle"
From: "Dave Dahle"
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <firstname.lastname@example.org> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net>
Subject: Re: V regulator input cap size?
X-Newsreader: Microsoft Outlook Express 5.50.4920.2300
Date: Mon, 21 Oct 2002 18:36:30 -0500
NNTP-Posting-Date: Mon, 21 Oct 2002 17:39:00 CDT
"DaveC" wrote in message
> 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),
> suggestions how I can make this voltage useable for my 12vdc circuit?
> Two-diode rectification? Single diode?
How about a two-stage approach? Find a regulator that'll accept a higher
input voltage to knock the supply voltage down to a more acceptable level to
feed the 7812 (Correct me if I'm wrong, people, but isn't there a way to
"float" an LM317 to accomplish this)?
Unless you want to throw major heat and install a honking big series
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