grant at stockly.com
Sun Jan 14 17:30:52 CST 2007
>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. : )
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