Subject: Re: V regulator input cap size?
Date: Mon, 21 Oct 2002 23:15:06 -0700
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <email@example.com> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <3DB48CD0.447092BF@rica.net>
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On Mon, 21 Oct 2002 16:25:07 -0700, John Popelish wrote
(in message <3DB48CD0.447092BF@rica.net>):
> 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.
How about a simple voltage divider across the 35vac liine? Say, divide such
that one of the resistors has 20 volts across it. It won't be the example of
efficient use of energy, but the circuit doesn't use more than about 300mA at
Is this a do-able solution?
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