Re: [N8VEM-S100:1134] S-100 SMB and S-100 bus extender PCBs status

[monahanz <mon...@vitasoft.org>]

Interesting Tom, have not used them. Are you sure the L4940-5 will generate less heat. The S100 8V line is kind of fixed at that. I know the L4940-5 can work with voltages just above 5V, but I would think it would have to burn off the excess 8 Volts as heat anyway.  

BTW for people building the SMB, be sure to get the 1.5A voltage regulators ( Jameco # 1130069 etc) not the 1A ones.

John


On Monday, October 8, 2012 9:39:22 PM UTC-7, Tom Lafleur wrote:
> Another option that will lower the heat load is to use a low drop out
> regulator like the L4940-5
>
> tom...
>
>
>
> On Mon, Oct 8, 2012 at 9:21 AM, John Monahan <mon...@vitasoft.org> wrote:
> > One thing I have yet to add to the web page for this board -- the 5V
> > regulator runs a little hot on that board (due to the hex displays).
> > Unfortunately the regulator is a bit too far to the left on the board. You
> > need to drill a hole off center on the heat sink to use a large one.  I'm
> > traveling will write this up later in the week.
> >
> > John
> >
> >
> > Sent from my iPhone
> >
> > On Oct 8, 2012, at 8:30 AM, "Andrew Lynch" <LYN...@YAHOO.COM> wrote:
> >
> > Hi!
> >
> > Good news!  The S-100 SMB and S-100 bus extenders are going out to their
> > builders!  I’ve sent email to everyone remaining on the waiting list and the
> > remaining PCBs are basically available in case anyone else would like them.
> > Please contact me.  Thanks and have a nice day!
> >
> > Andrew Lynch
> >
> >
> >
> > PS, John uses his SMB all the time and it has been very useful in the
> > debugging of the latest S-100 80386 CPU prototype board.  Really more good
> > news to come soon!
>
>
>
> -- 
> ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~
>
> Tom Lafleur
> (858) 759-9692