Re: 12vdc panel

["Rich" <Never@xxxxxxx>]

With out effecting the Phone operation


"Jim" <alarminex@xxxxxxx> wrote in message
news:1126317906.669378.269610@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Rich wrote:
> > What circuit would you use to get 12 VDC from 48 VDC?
> > Can some one post one.
> >
> >
> The basic circuit to reduce a DC voltage would be a simple voltage
> divider. You'd have to know the current requirements so you could
> determine the wattage of the resistors. If the current draw were
> constant this would be pretty simple. The problem with doing what you
> want to do with a "circuit" is that the current requirements for an
> alarm panel duing an alarm condition are far greater than when it's not
> in alarm conditon. So you'd need some kind of regulation circuitry too.
> By the time you re-invented a voltage converter you could have bought 5
> of them.
>