[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: mass storage for Apple //c
On Wednesday, 12 June 2013 08:08:35 UTC-7, Michael J. Mahon wrote:
> David Schmenk <dschmenk@gmail.com> wrote:
>
> > On Wednesday, 12 June 2013 00:13:56 UTC-7, Michael J. Mahon wrote:
>
> >> Riccardo <rigreco.grc@gmail.com> wrote:
>
> >>
>
> >>> The converter have a system protection of short-circuit or over range
>
> >>
>
> >>> current, (by a feedback control - it can put down all voltage output to 0
>
> >>
>
> >>> V for safety), but, anyway, all depends to type of over load current
>
> >>
>
> >>> (time/current curve).
>
> >>
>
> >>>
>
> >>
>
> >>>>
>
> >>
>
> >>>> The supply has internal protection. It will probably work fine--just give
>
> >>
>
> >>>>
>
> >>
>
> >>>> it a try.
>
> >>
>
> >>>>
>
> >>
>
> >>>
>
> >>
>
> >>> Oh no thanks! :-)
>
> >>
>
> >>>
>
> >>
>
> >>> (I don't trust of internal protection)
>
> >>
>
> >>>
>
> >>
>
> >>> Ric.
>
> >>
>
> >>
>
> >>
>
> >> The internal supply must protect itself from overloads, since there is no
>
> >>
>
> >> fusing on any connectors to the outside world.
>
> >>
>
> >>
>
> >>
>
> >> A bad power supply can fry a main board, but I've never seen a bad main
>
> >>
>
> >> board (or joystick, or...) fry a power supply. They just shut down
>
> >>
>
> >> (repeatedly) until the load is manageable.
>
> >>
>
> >>
>
> >>
>
> >> -michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
>
> >
>
> > Actually, I have some ROM 0 //c's and they do have a fuse on the MB.
>
> > Looks like a little glass cap near the back left. Couldn't find it on
>
> > any schematics, but managed to "discover" it when I was making a 12 V car adapter.
>
> >
>
> > Dave...
>
>
>
> So I'm guessing it's on the external supply line, just in case the polarity
>
> is reversed or voltage too high.
>
>
>
> -michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
"in case the polarity is reversed" Uh, certainly in my case :-(