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PICList Thread
'[OT] test pins'
1999\02\10@181933 by David Duffy

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Hi everyone,
I'm doing a PIC project at present with a few .1" headers on it
for external connections & test points.  Does anyone know of
a suitable female test recepticle for probing/connecting to the
individual pins ?  Some way of making jumper leads for going
between pins on different points would also be useful.  I tried
using machined pins from IC sockets but they are too small.
Has anyone done this before ?
Regards...

___________________________________
David Duffy               Audio Visual Devices
Ph: +61 7 38210362   Fax +61 7 38210281
spam_OUTAVDTakeThisOuTspamuq.net.au  Unit 8, 9-11 Trade Street
Cleveland, Qld, 4163, Australia.
___________________________________

1999\02\10@190025 by andy

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picon face
If you have room solder a long pin (like the old wire wrap type) socket to
vero with the usual breaks in the middle along each edge fit sil type
sockets, plug in the chip and then plug the whole lot into the board!

>Hi everyone,
>I'm doing a PIC project at present with a few .1" headers on it
>for external connections & test points.  Does anyone know of
>a suitable female test recepticle for probing/connecting to the
>individual pins ?  Some way of making jumper leads for going
>between pins on different points would also be useful.  I tried
>using machined pins from IC sockets but they are too small.
>Has anyone done this before ?
>Regards...

___________________________________
David Duffy               Audio Visual Devices
Ph: +61 7 38210362   Fax +61 7 38210281
.....AVDKILLspamspam@spam@uq.net.au  Unit 8, 9-11 Trade Street
Cleveland, Qld, 4163, Australia.
___________________________________

1999\02\10@202107 by Bob Drzyzgula

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One thing I recently ordered for my office has
turned out to be quite useful along these lines is
Berg pre-made daisy-chain jumpers.  These are sort
of like the jumpers you get with a break-out box, but
they come in a reel of 250 contacts all daisy-chained
together; just snip off what you need. If you need a
whole bunch of two-pin jumpers, you'll wind up with a
pile of little 2-inch pieces of blue wire as a bonus :-)
I can't afford them at home but I sure do appreciate them
at work. A reel costs US$233 from Allied Electronics; see
www.allied.avnet.com/catalog/catalogpages/467.pdf,
they're the "daisy chain jumpers" in the upper right hand
side of the page; I found that I had to get just that item
almost full-page for the graphic to be legible.

Another option is just regular old 0.1" crimp-to-wire
contact housings; most connector houses make them.
The ones I use at work are the AMP MOD IV connector system;
both Allied and Digi-key sell them. The AMP crimp tools
aren't cheap, although someone may be able to recommend
a third-party crimp tool. The main thing I don't like
about the MOD IV is that the single-row housings are too
thick to row-stack on a dual-row 0.1" header; you can
stack them side-to-side, and you can get 2xN housings,
but if you have, say, two 1x4 housings, you can use them
in a 1x8 configuration but not as though they were a 2x4
housing. When I run low I'll probably look for something
different.

--Bob


On Thu, Feb 11, 1999 at 09:26:48AM +1000, David Duffy wrote:
{Quote hidden}

--
============================================================
Bob Drzyzgula                             It's not a problem
.....bobKILLspamspam.....drzyzgula.org                until something bad happens
============================================================

1999\02\10@223339 by Wagner Lipnharski

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> A reel costs US$233 from Allied Electronics; see
> http://www.allied.avnet.com/catalog/catalogpages/467.pdf,

... a reel with 250 pins cost $233? isn't almost $3 some quite
expensive for a Y jumper? when you can buy by almost the same
price a microcontroller with 8k flash, 2k eeprom, 24MHz and more...

Wagner.

1999\02\11@002210 by Craig Lee

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Check out http://www.idinet.com

These guys make excellent test pins in many sizes.

I suggest the crown point ones for headers as the
header leads will get trapped by the crown and
contaminants don't get stuck like in the concave
pins.  You can get them with pre attached wires too.

Their catalogue is quite detailed.




> {Original Message removed}

1999\02\11@003500 by Tom Handley

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  David, look for headers or connectors that accept a 0.025" post. There
are several out there. You can also buy jumpers. I often make my own using
header strips. You can cut them as desired. Digikey sells 36 post strips
for $1.23. The part # is; 929974-01-36.

  - Tom

At 09:26 AM 2/11/99 +1000, David Duffy wrote:
{Quote hidden}

1999\02\11@075236 by Bob Drzyzgula

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Don't you hate it? It's painful how much some of this
connector stuff costs. You could probably make your
own Y jumpers for about $1-2 or so. Most crimp contacts
cost maybe between $0.10 and $0.50 each, depnding on
material, plating and other factors (manufacturer's
good name unfortunately being one of them). The Berg
jumpers also have the contacts covered with heat-shrink
of the right thickness that they fit tightly next to
each other in a 0.1"x0.1" grid without bending the pins.
Jumpers are undoubtedly available cheaper, but I bet not
*much* cheaper, and the 250-pin daisy chain is a very
convenient format.

Microcontrollers are an unbelievable bargain by comparison.

--Bob

On Wed, Feb 10, 1999 at 10:31:02PM -0500, Wagner Lipnharski wrote:
> > A reel costs US$233 from Allied Electronics; see
> > http://www.allied.avnet.com/catalog/catalogpages/467.pdf,
>
> ... a reel with 250 pins cost $233? isn't almost $3 some quite
> expensive for a Y jumper? when you can buy by almost the same
> price a microcontroller with 8k flash, 2k eeprom, 24MHz and more...
>
> Wagner.

--
============================================================
Bob Drzyzgula                             It's not a problem
bobspamspam_OUTdrzyzgula.org                until something bad happens
============================================================

1999\02\16@233251 by Ron Harding

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Hello.  I am a test engineer, so I deal with constructing 'test fixtures'
all the time.  You didn't mention the header configuration that you
have.  If you have standard stake pins with .1 centers, try using IDC
connectors that have the crimp on ribbon cable option ( the connectors that
are on your PCs' hard drive and floppy drive ribbon cables.    Then you can
'break out' at the other end of the ribbon cable. If that is not
appropriate, there are several other options.  Unfortunately, some of them
require that you have the proper crimping tool to crimp wire connections.
These tools are not cheap.  They come in handy for projects I work on for
myself as well.

Please give me your specific requirements, as I may be able to give you a
better answer.

Sincerely,

Ronald A. Harding


"When natural inclination develops into a passionate desire, one advances
toward his goal in seven league boots"
- Nikola Tesla


I----Original Message-----
From: David Duffy <@spam@AVDKILLspamspamUQ.NET.AU>
To: KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU <RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU>
Date: Wednesday, February 10, 1999 3:19 PM
Subject: [OT] test pins


{Quote hidden}

1999\02\17@075334 by David Duffy

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Ronald A. Harding wrote;
>Hello.  I am a test engineer, so I deal with constructing 'test fixtures'
>all the time.  You didn't mention the header configuration that you
>have.  If you have standard stake pins with .1 centers, try using IDC
>connectors that have the crimp on ribbon cable option ( the connectors that
>are on your PCs' hard drive and floppy drive ribbon cables.    Then you can
>'break out' at the other end of the ribbon cable. If that is not
>appropriate, there are several other options.  Unfortunately, some of them
>require that you have the proper crimping tool to crimp wire connections.
>These tools are not cheap.  They come in handy for projects I work on for
>myself as well.

Some on the list were confused as to what I was asking for originally !
What I need is *single* female recepticles to click onto individual pins
if pcb connectors such as IDC10,etc.  Then I can run these test points
off to other pcb's or other test connectors on the same pcb,etc. What
I did find was DB connector pins (female) to suit the crimp type shells
where you only fit the pins you need. I got them from RS Components.
They are a good enough fit for test connection - just add wire & heatshrink.
I ordered 2 types but only one was a good fit on the .1" headers.  I can
look up the part number of the right ones if anyone wants.
Regards...

_______________________________________________________________
Dave Duffy         Audio Visual Devices           TakeThisOuTAVDEraseMEspamspam_OUTuq.net.au
Unit 8, 9-11 Trade Street, Cleveland, Queensland 4163 Australia
Phone: +61 7 38210362                 Facsimile: +61 7 38210281
_______________________________________________________________

1999\02\18@013650 by Alan King

picon face
 Waldom C-Grid box crimp terminals or AMP MT Connector
contacts are what you need..  us$.98 for 10 or $7.80 for 100.
(old digikey catalog, but should be about right)
Alan


David Duffy wrote:

{Quote hidden}

1999\02\19@113944 by Bob Drzyzgula

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On Wed, Feb 17, 1999 at 10:57:07PM +1000, David Duffy wrote:
>
> Some on the list were confused as to what I was asking for originally !
> What I need is *single* female recepticles to click onto individual pins
> if pcb connectors such as IDC10,etc.  Then I can run these test points
> off to other pcb's or other test connectors on the same pcb,etc. What
> I did find was DB connector pins (female) to suit the crimp type shells
> where you only fit the pins you need. I got them from RS Components.
> They are a good enough fit for test connection - just add wire & heatshrink.
> I ordered 2 types but only one was a good fit on the .1" headers.  I can
> look up the part number of the right ones if anyone wants.
> Regards...

Oh, *that's* what you wanted :-)

One thing I've found very handy are the Pomona Electronics
banana to header pin adapters. The 4690 has a socket on
one end that fits tightly over a 0.025" square pin, while
the other end has a standard banana jack. They are overall
about 2.5" long, about 2" of which is a thin, bendable
PVC shaft that will hold it's bend and not spring back
into the way.  All you need is one of these and a regular
male-male banana patch cable to securely connect a header
pin into a DMM.  The 4691 has a 0.030" round pin instead
of a socket, and will happily insert in most IDC female
socket headers, but are too fat to insert into a machined
pin IC socket. Pomona makes them in other sizes as well,
for larger diameter pins. I think that I got them from
Allied Electronics, they cost maybe $3-4 each.

--Bob

--
============================================================
Bob Drzyzgula                             It's not a problem
RemoveMEbobspamTakeThisOuTdrzyzgula.org                until something bad happens
============================================================

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