[time-nuts] Regulator choices
alsopb at nc.rr.com
Sun Jun 30 11:48:42 EDT 2013
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
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
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,
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