On Mon, 1 Jun 1998, Tony Duell wrote:
> > On a similar note, ferroresonant transformers can do some very
> > bizarre things when offered a mains frequency they weren't designed
> > for. DG's Eclipse S/230 uses a single resonant transformer, rectifiers,
> > and filter caps for its power supply and little else. The specifications
> > call for a mains frequency deviation of under 1/2 Hz in either
> > direction. However, if the frequency is good, the regulation that
> > the supply gives is quite remarkable.
>
> Well, late versions of the power supply for the DRI/Diablo Model 30 disk
> drives (AKA DEC RK02 and RK03) used a ferroresonant transformer. It
> provided the +15V and -15V lines (the former was regulated conventionally
> for the +5V line, I think). There was no other regulation on these lines,
> which supplied most of the analogue circuitry and the motors in these
> drives. Only drive I ever saw that used a DC permanent magnet motor and a
> rack and pinion drive as the head positioner...
Tony, the Miniscribe 84nn series used a stepping motor and a rack and pinion
as a head positioner, also. There are a few others, but the make/model
do not come to mind.
- don
> > | Carl Richard Friend (UNIX Sysadmin) | West Boylston |
>
> -tony
>
donm_at_cts.com
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Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
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Received on Mon Jun 01 1998 - 23:33:59 BST