Maybe I read the original posting wrong but I think this thread has
departed greatly from the original posting.
What I thought the posting said:
1) The already present transformer can produce ~20 V DC unregulated at
sufficient current.
2) The desire was to have a 12 V regulated at somewhat greater than 1 amp.
Though it wasn't raised in the first posting. A clean, non-switching
supply was desirable for the poster.
Thus, it isn't a case of attaching one regulator in series with another
Regards
Brian
On 6/30/2013 14:43, Charles P. Steinmetz wrote:
A three-terminal regulator (3TR) comprises (i) a voltage reference, (ii)
an error amp, and (iii) a current amplifier. There is no need to
duplicate the voltage reference or the error amp just because you need
more current. In fact, they can only lead to problems with current
sharing and/or oscillation. If the need is simply more current, add an
external pass device. It may not be quite as easy as piling on more
3TRs (i.e., it takes a little thought), but at the several-ampere level
it will almost certainly be cheaper. In many cases, the design is
already done -- there are hundreds, if not thousands, of example
circuits in manufacturers' app notes, which are easily found on the Web.
Best regards,
Charles
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