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Re: [N8VEM-S100:1137] S-100 SMB and S-100 bus extender PCBs status
the Vdrop (~500mv) on the part is 1/2 of the 7805 (1v) , so less power
dissipate in the part...
On Wed, Oct 10, 2012 at 11:10 AM, monahanz <mon...@vitasoft.org> wrote:
> 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
~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~