Switching PS for S-100 Computer?

From: Rich Beaudry <r_beaudry_at_hotmail.com>
Date: Thu Aug 23 14:34:29 2001

>Date: Wed, 22 Aug 2001 19:44:49 -0400
>From: "ajp166" <ajp166_at_bellatlantic.net>
>Subject: Re: Switching PS for S-100 Computer?

>From: Rich Beaudry <r_beaudry_at_hotmail.com>
>>I would like to ask if any of you know of an existing, available,
commercial
>>switching power supply that could be used to power an S-100 computer?
>
>WHY???? The bus voltages for S100 are UNREGULATED.

OK ... so how does this change things? If I have an unregulated 8 Volt
power supply, and the regulators on the cards regulate that down to 5 V, how
is that different from having a regulated SMPS at 8 volts, and still having
the regulators drop it down to 5 Volts. Perhaps stupid, but is it
technically possible, and will it work without harming the boards?

I thought it would be easier to get a modern supply, so I wouldn't have to
try to build one... Of course, now that I look at the prices for SMPS....
YIKES!

>> realize I could get a +5V and +/- 12V supply
>> and just remove the regulation circuitry on the cards

>Only if its an old LINEAR supply as SMPS designs mostly will not dot it.

I'm not sure what you mean by that....

>The S100 power supply is terminally simple. Three transformers
>{8,16, 16 V AC}, three bridge rectifiers and three caps... thats all
>folks.

Yup, I know ... Try finding a new, "available from a distributor"
transformer these days that will handle these voltages and currents, and I
will quietly slink off... That's the reason I'm looking for alternatives. I
can't find a transformer that will give me the voltages and currents I need.
Links to these distributors are welcomed...

Rich B.
Received on Thu Aug 23 2001 - 14:34:29 BST