Dragon32 Power-Supply - test-drb@ccmp.vtda.org

23 Nov 2004

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.
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