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FWIW, a set of pins for the SPI header (J1, the seven through-holes at
the top of the BX-24 module) and Pins 25, 26 and 27 (at the bottom)
can come from any new TO-220 device, like a TIP31 transistor. One
might presume that's an expensive source but, at US$0.39 for three
pins, it really isn't all that bad. They make nice flat pins. Tom


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Tom Becker wrote:

> FWIW, a set of pins for the SPI header (J1, the seven through-holes at
> the top of the BX-24 module) and Pins 25, 26 and 27 (at the bottom)
> can come from any new TO-220 device, like a TIP31 transistor. One
> might presume that's an expensive source but, at US$0.39 for three
> pins, it really isn't all that bad. They make nice flat pins.

I use part 517-6111TG from mouser.com. It costs $0.81 for 40 pins which
is much cheaper than your solution. Similar parts are available from
most parts suppliers like digikey.

Is there something I am missing here that requires the leads from a
$0.39 transistor?

Mike

517-6111TG

517-6111TG




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> Is there something I am missing here that requires the leads from a
$0.39 transistor?

Header pins are square and do not fit many IC sockets without force that
crushes the socket's internal spring - making the connection unreliable
- if it fits at all. Flat pins do not do that. If are aware of a
source of flat pins I'd like to know about it. Tom



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Tom Becker wrote:

> > Is there something I am missing here that requires the leads from a
> $0.39 transistor?
>
> Header pins are square and do not fit many IC sockets without force that
> crushes the socket's internal spring - making the connection unreliable
> - if it fits at all. Flat pins do not do that. If are aware of a
> source of flat pins I'd like to know about it.
>
Ok I understand now. I have 2 possible sources for smaller diameter
(albeit not flat) pins:
- LED leads (You can get 100 for $1.95 from MPJA.com) - that's $0.01 per
pin. I have also used cutoff leads from other thru-hole components
including resistors, diodes and capacitors.
- Mouser.com stocks pins (part # 575-311720) at $0.12 each or $0.10 for
quantity 10.

Mike

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> ... I have 2 possible sources for smaller diameter (albeit not flat) pins...

The Mouser parts still look like 25-mil square pins. Take a look at
"BX-24 34-pin socket" in Photos to see what they need to fit. Tom




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--- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
> [...] US$0.39 for three pins

Another alternative is Vector "inbord" pins like p/n K36C. They're
0.023" round pins about 3/4" long. These should fit most sockets
including machine pin sockets. In 100 piece quantities they are about
$0.11 each; in 1000 piece quantities about $0.05 each.

You can get either quantitiy at Allied Electronics:
http://www.alliedelec.com/Search/SearchResults.asp?SearchQuery=k36c

I think Mouser stocks the 1000 piece bags.

Here is a link to Vector's site:
http://www.vectorelect.com/Product/Accessories/Pins/K36C.htm

Don



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Tony, this is your last warning.

Moderator
Don,

Hey, those are nice! When they are rated as fitting 0.025" holes,
does that include the plating inside the hole? I understand that
during PCB manufacture the hole measurement is nominal before
plating. This is an issue I took a little gamble with recently when
I sent out a small PCB design. I specified 0.035 holes for a male
pin header. The base of the pins on the header mike at about 0.028,
so I ought to have clearance for plating of the holes..... I will
find out in a week or 2.

I could not tell, but does vector make some of these pins that are
the same diameter and length on both sides so you can have a female
pin header on both the top and the bottom?

-Tony

--- In basicx@basi..., "Don Kinzer" <dkinzer@e...> wrote:
> --- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
> > [...]




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I did some checking and I do not see any option to avoid including the
original message in the response. Therefore, I have to manually
delete it. I will try hard to do so, but often it is invisible below
the lower edge of my message window, and I may well mistakenly forget
to delete the stuff as I snap off a response. I suppose my time here
may be limited as a result.

I truely apologise for any wasted bandwidth.

Is there some method to default to NOT including the original
message? I will use that option if it is available.

-Tony



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What is it my last warning about?

Is it that I included the original post in my response?

Is it illegal to include ANY clip of the message to which one is
referring to? The message that I think I included was only *14*
lines long, including blank lines! In many cases these threads that
are many messages long, it becomes hard to tell exactly what the
response is all about!

Is bandwidth that much of an issue that the loss of understanding of
the reference is necessary?

If it is necessary to avoid *all* reference to the original message,
then the forum software should default to this setting. I do not
even know if I can make this my default setting. If I can, then you
as the moderator should be able to reset everyone's settings to NOT
include the original message.

I want to play by the rules, but this is a little draconian.

-Tony --- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
> [...] US$0.39 for three pins

Another alternative is Vector "inbord" pins like p/n K36C. They're
0.023" round pins about 3/4" long. These should fit most sockets
including machine pin sockets. In 100 piece quantities they are about
$0.11 each; in 1000 piece quantities about $0.05 each.

You can get either quantitiy at Allied Electronics:
http://www.alliedelec.com/Search/SearchResults.asp?SearchQuery=k36c

I think Mouser stocks the 1000 piece bags.

Here is a link to Vector's site:
http://www.vectorelect.com/Product/Accessories/Pins/K36C.htm

Don





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> ... this is a little draconian.

No, no. You haven't seen my little draconian measures yet, Tony, and I
have some big ones I can wield, too. Am I persistent? Maybe, but not
draconian.

I invite you to edit your messages - manually, like most others here do
- to retain only the relevant portion of the message to which you
respond. It will take you a few moments, but your message will be
concise - and more potent.

Remember this, please. Your message might be read by 2200 readers on
this list alone, and the list is also available elsewhere. You might be
producing the equivalent traffic of a 2k-byte file for each byte of your
message. We've already read the previous message; it is not necessary
to send it 2200 times more. Tom





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I will do my best to delete the extraneous stuff.

I guess there is no way to turn off the automatic copy of the original
message.... I would hope that this change might be made by the YAHOO
admin sometime. There are many ways to make it work easily. Maybe
there would be defaults for each group and the moderator could set the
default, and make the default able to be changed by individual
members, or it could be locked.

Maybe we can request this.

like I said, I want to play by the rules, I just want it to be easy
too.

-T




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