[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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.


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


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