Dragon32 Power-Supply

[Geoffrey Thomas]

Dragon psu diagram here , plus pinouts etc.

http://www.onastick.clara.net/dragonhw.htm

Geoff.

----- Original Message -----
From: "Dave Dunfield" <dave04a at dunfield.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Wednesday, November 24, 2004 10:36 AM
Subject: Re: Dragon32 Power-Supply


> At 19:54 23/11/2004 +0000, you wrote:
> >Dave Dunfield wrote:
> >> Can anyone give me the pinout and details of the power
> >> supply used on the Dragon32 (have a machine with no
> >> supply) - It has a 9-pin 'D' connector on the back of
> >> the machine for the power input!
> >
> >OK, I've just got my machine down from the loft and had a look
> >for the manual -- but I don't have a manual!  So, time to test
> >it with a meter...
> >
> >Pin 1 joined to Pin 6, one side of 8.5V AC    Red
> >Pin 2 joined to Pin 7, other side of 8.5V AC  Black
> >Pin 3 14V AC                                  Yellow
> >Pin 4 0V                                      White
> >Pin 5 14V AC                                  Blue
> >
> >The two 14V AC windings form a centre-tapped 28V winding, which
> >according to the label on the transformer is rated at 250mA.  The
> >8.5V winding is rated 1.5A.  The actual voltages I measured were
> >8.9V and 14.3V (twice), so they're slightly higher off-load.  The
> >9-pin 'D' connector on the end of the PSU cable is a female.  The
> >PSU itself is clearly just a transformer in a white plastic box.
>
> Hi John,
>
> Thanks for the info - makes perfect sense, an 8v input to drive
> a 5v supply, and C.T. 28v input to drive +/-12.
>
> I shall see if I can fire it up this weekend.
>
> Regards,
> Dave
> --
> dave04a (at)    Dave Dunfield
> dunfield (dot)  Firmware development services & tools: www.dunfield.com
> com             Vintage computing equipment collector.
>                 http://www.parse.com/~ddunfield/museum/index.html
>
>


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