23 Nov
2004
23 Nov
'04
11:36 p.m.
At 19:54 23/11/2004 +0000, you wrote:
Dave Dunfield wrote:
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
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.