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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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- Reply-to: <jack....@ameritech.net>
- Thread-index: Acy/p2TjzlYkUpZvT/2AQIKFhis+zQAN24Rw
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.
Jack
> -----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
> computer?
>
> On 12/20/2011 02:49 PM, W3DRK wrote:
> [clip]
> >
> > 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.
> >
> [clip]
> > 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
> -----
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