Re: [N8VEM-S100:554] Best place to start building S100 computer?

[Mike <mi...@pikeaero.com>]

On 12/20/2011 02:49 PM, W3DRK wrote:
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> 
> I'd like to start by collecting the basic "core" parts such as a power
> supply and motherboard and build up from there.
> 
> Fortunatly I am friends with someone in the custom transformer field
> so getting a decent transformed sized just for this purpose should be
> pretty strait forward, and perhaps even less expensive then using 2 or
> 3 seperate SMPS units.  I already have heavy heatsink mounted
> rectifier diodes, filter caps, etc so that helps too.
> 
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> Thanks!
> Dieter Kedrowitsch - W3DRK

Hi Dieter,

I'd agree with the others regarding the use of a switching power supply.
I got a 7.5V @42A supply from eBay that has a little bit of voltage
adjustment, but I'm leaving it at 7.5V so the 7805s will run a little
cooler.

I also got, from eBay, a couple of 12V @5A switchers  to run the +/- 16V
rails, they will adjust to about 14.5V which will be fine.

All together I don't think I spent more than about $80 on the power
supplies.

PS. Sorry I've been slacking on the 68K work, guys, I've been just up to
my neck, it's getting closer to the front burner however.

Mike Sharkey
http://8bit.zapto.org