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RE: [N8VEM-S100:557] Best place to start building S100 computer?
- To: <n8vem...@googlegroups.com>
- Subject: RE: [N8VEM-S100:557] Best place to start building S100 computer?
- From: "Jack Rubin" <jack....@ameritech.net>
- Date: Wed, 21 Dec 2011 06:50:36 -0600
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Why fight to drive uphill to just heat the room? Just eliminate the 78xx
regulators and run 5 and 12 volts on the rails! That's what Godbout and
Morrow did at the end - it's certified vintage and it's smart.
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com]
> On Behalf Of Mike
> Sent: Wednesday, December 21, 2011 12:11 AM
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:557] Best place to start building S100
> On 12/20/2011 02:49 PM, W3DRK wrote:
> > I'd like to start by collecting the basic "core" parts such as a
> > 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
> > 3 seperate SMPS units. I already have heavy heatsink mounted
> > rectifier diodes, filter caps, etc so that helps too.
> > Thanks!
> > Dieter Kedrowitsch - W3DRK
> Hi Dieter,
> I'd agree with the others regarding the use of a switching power
> 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
> I also got, from eBay, a couple of 12V @5A switchers to run the +/-
> 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
> PS. Sorry I've been slacking on the 68K work, guys, I've been just up
> my neck, it's getting closer to the front burner however.
> Mike Sharkey
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