RE: [N8VEM-S100:4222] Re: S-100 Bus Extender and S-100 Bus Terminator Boards Have Arrived

We had this same issue with the S100 bus extender board. Might be worthwhile somebody putting together a list of MFG’s and the transistor orientation for these two common (and often used with our boards) transistor.

John

From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Don Caprio
Sent: Monday, June 16, 2014 11:53 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:4222] Re: S-100 Bus Extender and S-100 Bus Terminator Boards Have Arrived

I just checked the datasheets on Fairchild 2N3904 & 2N3906.

Both TO-92 package have the same footprint and orientation for EBC.

On Mon, Jun 16, 2014 at 11:06 AM, Don Caprio <cap...@uxpro.com> wrote:

O perfect. More 'variables'.

Thanks for the heads up Tom.

On Mon, Jun 16, 2014 at 11:01 AM, Tom Lafleur <laf...@lafleur.us> wrote:

Something to look at. Some vendors of 2n3906/04 and other small single transistors have different pin orientation for their parts in TO92 case. C and E are swaped. Look at the vendors data sheet for your part, not a generic one.

~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~

Sent from my Phone

On Jun 16, 2014, at 12:16 PM, Don Caprio <cap...@uxpro.com> wrote:

Rich,

I don't know if version 2 of the backplane suffers from the same error.
I'm not even sure what version of the board I have. However I'm pretty
sure mine is wrong. A peek with a magnifine glass shows the square
pad on Q1 is opposite of Q2. Looks like I have to swap the orientation
of Q1. I have not tested the backplane yet.
On Sun, Jun 15, 2014 at 4:49 PM, Richard Cini <rich...@verizon.net> wrote:
Don —

I have Version 02 of the 8-slot backplane (uncompleted) and Q1 has the same footprint error. Is the fix to put the transistor in opposite to the silkscreen?

Rich

--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32

From: Don Caprio <ilv...@gmail.com>
Reply-To: S100-Post <n8vem...@googlegroups.com>
Date: Friday, June 13, 2014 at 3:16 PM
To: S100-Post <n8vem...@googlegroups.com>
Subject: Re: [N8VEM-S100:4159] Re: S-100 Bus Extender and S-100 Bus Terminator Boards Have Arrived
I was looking at the S-100 18 slot backplane and saw notes on the incorrect
footprint on transistor Q1.

I have the 8 slot version and have no such notes on Q1. When I pull up the docs from
the wiki I see that Q1 suffers from the same error.

Can those of you that have the 8 slot board running confirm this board suffers from the same error?

Are any 18 slots boards available?

Thank you.
<8slotQ1Q2.png>
On 06/ 6/14 06:49 PM, Edward Snider wrote:
Do you have me down for either of these Todd?

I don't remember.

Ed

On Friday, June 6, 2014 9:12:46 AM UTC-5, Todd Goodman wrote:
The S-100 Bus Extender and S-100 Bus Terminator boards have arrived.

http://s100computers.com/My%20System%20Pages/Extender%20Board/Extender%20Board.htm
http://s100computers.com/My%20System%20Pages/Terminator%20Board/Bus%20Terminator%20Board.htm

Please let me know if you'd like any. The usual price of $20 each plus $5.95 shipping in the US. If you're outside the US then I'll
let you know the actual postage once I have the package set up and weighed.

If you ordered other boards and want them to ship together that's no problem either.

Thank you!

Todd
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