13 Jan
2007
13 Jan
'07
10:34 p.m.
I'm looking for a source of transformers like those used in the Altair
680. In addition, does anyone have any idea what the rated current output
is with the Altair 680? I do not have an assemnly manual. If anyone has
an idea of the watt rating I'd appreciate it. : )
It has 102620 and 9967736 written on it.
It only has one primary coil.
There are two secondary coils. One with a center tap and one without.
Here are some stats I took:
Primary: 121.4vAC
Secondary 1: 11.13vAC (used for +9v/+5v)
Secondary 2: 14.57vAC parallel, 29.2vAC series (used for +/-16vDC supply)
Thanks,
Grant
13 Jan
13 Jan
11:08 p.m.
Grant Stockly wrote:
I'm looking for a source of transformers like
those used in the Altair
680. In addition, does anyone have any idea what the rated current
output is with the Altair 680? I do not have an assemnly manual. If
anyone has an idea of the watt rating I'd appreciate it. : )
It has 102620 and 9967736 written on it.
It only has one primary coil.
There are two secondary coils. One with a center tap and one without.
Here are some stats I took:
Primary: 121.4vAC
Secondary 1: 11.13vAC (used for +9v/+5v)
Secondary 2: 14.57vAC parallel, 29.2vAC series (used for +/-16vDC supply)
Thanks,
Grant
If all else fails have a new transformer made here.
http://www.electra-print.com/
11:27 p.m.
If all else fails have a new transformer made here.
http://www.electra-print.com/
Have you used them before? Their prices on custom transformers seem very
reasonable...
Grant
14 Jan
14 Jan
6:51 a.m.
Grant Stockly wrote:
I have, but I also ordered a small transformer.
The S-100 power supply if I remeber right had lots of amps.
20+ amps on the +8 line I think. Only a few amps on the +-12? volts.
If all else fails have a new transformer made here.
http://www.electra-print.com/
Have you used them before? Their prices on custom transformers seem
very reasonable... Grant
.
7:43 a.m.
On 13 Jan 2007 at 23:51, woodelf wrote:
The S-100 power supply if I remeber right had lots of
amps.
20+ amps on the +8 line I think. Only a few amps on the +-12? volts.
On the Altair 8800 the power supply is pretty anemic, as I recall.
OTOH, the one on my Integrand box is one big hunk of iron.
Cheers,
Chuck
8:06 a.m.
At 10:43 PM 1/13/2007, you wrote:
On 13 Jan 2007 at 23:51, woodelf wrote:
I'm talking about the 680. It has to be around 25-30w. Its
2.4"x2.2"x2"
I wanted to do switchers, but there is hardly any room for one.
Grant
The S-100 power supply if I remeber right had
lots of amps.
20+ amps on the +8 line I think. Only a few amps on the +-12? volts.
On the Altair 8800 the power supply is pretty anemic, as I recall.
OTOH, the one on my Integrand box is one big hunk of iron. 
1:38 p.m.
Grant Stockly wrote:
At 10:43 PM 1/13/2007, you wrote:
The original power supply for the 680 was WAY undersized...
You can get a pretty good idea of the transformar rating from
the size. (or weight) Look through the catalogs for something
of similar size and use it's power rating to calculate how much
the original transformer could have provided.
In the 680 almost all of the load was on the 5 volt supply.
(and +9 unreg for option cards)
Are you doing an exact recreation or using more modern parts?
joe
On 13 Jan 2007 at 23:51, woodelf wrote:
I'm talking about the 680. It has to be around 25-30w. Its
2.4"x2.2"x2"
I wanted to do switchers, but there is hardly any room for one.
Grant The S-100 power supply if I remeber right had
lots of amps.
20+ amps on the +8 line I think. Only a few amps on the +-12? volts.
On the Altair 8800 the power supply is pretty anemic, as I recall.
OTOH, the one on my Integrand box is one big hunk of iron.
11:30 p.m.
The original power supply for the 680 was WAY
undersized...
You can get a pretty good idea of the transformar rating from
the size. (or weight) Look through the catalogs for something
of similar size and use it's power rating to calculate how much
the original transformer could have provided.
In the 680 almost all of the load was on the 5 volt supply.
(and +9 unreg for option cards)
I want to get as hefty a power supply I can and still fit in the
enclosure. The 680 was often modded to have two transformers in
parallel. I would be interested in doing that depending on the cost. I
was hoping someone would have a manual from MITS that mentions the VA or
output on each of the 2 secondaries.
Would knowing the resistance of any of the coils tell me the current
capacity? Probably not without knowing the number of coils? As long as
the replacement has a higher output than the origional I'm happy.
Are you doing an exact recreation or using more modern
parts?
I don't know what you mean. About as exact as the 8800 kit I did. Except
maybe a little more since there isn't room for a switching power supply.
The 680 isn't as well known, or nearly as available on the
aftermarket. Thought it would be a good one to preserve the software. : )
Grant
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bfranchuk＠jetnet.ab.ca -
cclist＠sydex.com -
grant＠stockly.com -
jclang＠notms.net