22 Nov
2004
22 Nov
'04
4:48 p.m.
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!
Searched and found some hardware info, but not the power
information...
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
23 Nov
23 Nov
8:54 a.m.
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.
--
John Honniball
coredump(a)gifford.co.uk
6:09 p.m.
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.
Thanks for the infromation. I've got much the same problem (a Dragon 32
less the PSU brick) so sometime I can get round to making one. It's not
urgent (I have plenty of CoCos), but I do like to have my machines
operational.
-tony
24 Nov
24 Nov
1:31 a.m.
On Wed, 2004-11-24 at 05:09 +0000, Tony Duell wrote:
There's an uncomfirmed rumour that the proper Acorn Atom brick is the
same as the Dragon 32 one, just with a different lead (and unused taps
on the transformer presumably!).
In the six or so Atoms that have passed through my hands though I've
never had one with the original supply, so I can't confirm that :) (All
of mine have either been kits - and I assume the PSU was optional - or
previous owners have bypassed the regulators and used a more capable
supply)
I'm not sure what voltages the D32 uses internally. I've been told that
the D64 regulator board is different to the D32 one even though it uses
the same brick - so it's possible half the outputs of the brick aren't
even used in a D32...
cheers
Jules
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.
Thanks for the infromation. I've got much the same problem (a Dragon 32
less the PSU brick) so sometime I can get round to making one. It's not
urgent (I have plenty of CoCos), but I do like to have my machines
operational.
1:47 a.m.
Jules Richardson wrote:
There's an uncomfirmed rumour that the proper
Acorn Atom brick is the
same as the Dragon 32 one, just with a different lead (and unused taps
on the transformer presumably!).
The Dragon brick that I have is made with exactly the same plastic
mouldings as the UK101 brick. Except that the UK101 brick is
black and the Dragon brick is white. The early UK101s had a bare
transformer (and you had to supply your own mains wire!) but the
later ones had the brick.
Just for completeness, the UK101 brick is 9-0-9V AC, 3Amps.
--
John Honniball
coredump(a)gifford.co.uk
1:52 a.m.
Jules Richardson wrote:
In the six or so Atoms that have passed through my
hands though I've
never had one with the original supply, so I can't confirm that :) (All
of mine have either been kits - and I assume the PSU was optional - or
previous owners have bypassed the regulators and used a more capable
supply)
Ah, that was a standard modification. The Atom uses two 7805
regulators in parallel, which is not a good way to turn two
1A regulators into a 2A PSU. In practice, one regulator
(depending on the voltage tolerances of the parts) takes
nearly all the load, while the other regulator just sits
there. So, many Atom users who expanded their machines
also bypassed the regulators and added a proper external
supply.
I'll check my boxed Atom in the loft sometime to see what
brick it's got.
--
John Honniball
coredump(a)gifford.co.uk
2:26 a.m.
On Wed, 2004-11-24 at 12:52 +0000, John Honniball wrote:
Jules Richardson wrote:
Uh huh. I think I've got *one* that still has the regulators and
heatsink intact. I seem to recall that bypassing the regulators was also
a modification when adding the disk pack; the floppy drive unit
contained all the power regulation for itself and the machine, and just
fed regulated 5V DC into the back of the Atom.
In the six or so Atoms that have passed through
my hands though I've
never had one with the original supply, so I can't confirm that :) (All
of mine have either been kits - and I assume the PSU was optional - or
previous owners have bypassed the regulators and used a more capable
supply)
Ah, that was a standard modification. The Atom uses two 7805
regulators in parallel, which is not a good way to turn two
1A regulators into a 2A PSU. In practice, one regulator
(depending on the voltage tolerances of the parts) takes
nearly all the load, while the other regulator just sits
there. So, many Atom users who expanded their machines
also bypassed the regulators and added a proper external
supply. I'll check my boxed Atom in the loft sometime to
see what
brick it's got.
I've got one boxed one, but it came without a PSU. Actually, there
almost didn't appear to be space in the box *for* a PSU, which made me
wonder if those were shipped as a seperate parcel.
I'm still looking for an Atom with a colour board; presumably by the
time the colour board came on the scene everyone was buying BBC micros
so they're somewhat rare (although I do have an Atom with the BBC BASIC
board in it). Would be nice to get my hands on a Prophet sometime too!
cheers
Jules
4:59 a.m.
Jules Richardson wrote:
There's an uncomfirmed rumour that the proper
Acorn Atom brick is the
same as the Dragon 32 one, just with a different lead (and unused taps
on the transformer presumably!).
Not even remotely. The original Acorn Atom PSU was 8v at about 1.5A DC
if I remember correctly. I "acquired" one from my Dad's work when it
wouldn't work, or more accurately would work for only a few minutes
before turning itself off. The scorch marks on the inside of the case
around the heatsink bolts were a dead giveaway...
Fully loaded, with every socket filled, it drew nearly 3A.
Gordon.
1:22 p.m.
There's an uncomfirmed rumour that the proper
Acorn Atom brick is the
same as the Dragon 32 one, just with a different lead (and unused taps
on the transformer presumably!).
Considering the Dragon brick has 2 AC outputs (14-0-14 and 8.5V) and the
Atom brick has a 9V DC output, I think that's highly unlikely!. The case
might be the same, but the internals are different.
In the six or so Atoms that have passed through my hands though I've
never had one with the original supply, so I can't confirm that :) (All
of mine have either been kits - and I assume the PSU was optional - or
previous owners have bypassed the regulators and used a more capable
supply)
The reuglators in the Atom were marginal at the best of times, and it was
a semi-official mod to make the machine run off an external 5V supply
bypassing the regulators.
I'm not sure what voltages the D32 uses internally. I've been told that
the D64 regulator board is different to the D32 one even though it uses
the same brick - so it's possible half the outputs of the brick aren't
even used in a D32...
The Dragon 32 needs +5V (obviously), +12V and at least one of -12V and
-5V. AFAIK all the outputs from the brick are used. The D64 PSU board
IIRC includes at least part of the serial port circuit (not present on
the D32), which is presumably why it's a different PCB.
-tony
4 Dec
4 Dec
5:33 p.m.
Dave Dunfield wrote:
John, being that Dave is in Canada I think the PSU would be different for
the version we got over here in the states (which was manufactured by
Tano). My box is black by the way. ;)
Marty
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.
--
John Honniball
coredump(a)gifford.co.uk
5 Dec
5 Dec
7:23 a.m.
John, being that Dave is in Canada I think the PSU
would be different for
the version we got over here in the states (which was manufactured by
Tano). My box is black by the way. ;)
Well, the input voltage would be differnt (the UK model would be wound
for 240V input, the US model for 115V), but is there any reason why the
output voltages wouldn't be the same for all models of Dragon?
-tony
4 Dec
4 Dec
5:30 p.m.
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!
Searched and found some hardware info, but not the power
information...
Regards,
Dave
Hi Dave, here's the info directly off of my power supply:
P/N: TD64-1
INPUT: 115V 60HZ 28W
OUTPUT: 8VAC~1.5A 28VAC~0.25A CT
I don't have a pinout, but looking at it briefly the left bottom ones are
empty:
________
\OOOOOO/
\00OO/
Another option is this company which is still selling new Dragon 32's
(complete with power supply) for $35!
http://www.cadigital.com/computer.htm
Marty
7267
days inactive
7280
days old
11 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
coredump＠gifford.co.uk -
dave04a＠dunfield.com -
gordon＠gjcp.net -
julesrichardsonuk＠yahoo.co.uk -
wgungfu＠csd.uwm.edu