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'[PIC]: Anyone used this device before?...'
2002\05\30@203243 by Drew Vassallo

picon face
>I'm thinking of
>using it as a simple way to program 16F872-I/SO
>chips.

Someone (Olin or Bob Ammerman I think) listed a site that has tons of
adapters for programming.  The ones for the 16F872 SOIC were $75.  They were
ZIF sockets, essentially, that clamp down on the SOIC and have header pin
rows so you can place it into your programmer.

I think this is quite a bargain if you're considering doing lots of
programming.

However, for prototypes, you can just as easily make one by etching out a
SOIC pad pattern and running traces to pads and soldering in headers in a
similar fashion.  Of course, you don't have the neato spring-loaded clamp to
hold down the chip, so you have to use your fingers and hold it onto the
pads.  Since the PIC is .050 spacing, it's really not that hard at all.

I've done dozens this way without problems.  I would recommend using a
ground strap, though, if you do this.

But hey, if you want to pave the way for a new method, go right ahead.
However, it does require that you solder the chip into the board first.  If
you're doing lots of SMD on the board, though, this probably isn't the way
to go.

--Andrew

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2002\05\30@231150 by Pic Dude

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face
Hmmm...  $75 on a hobbyist's budget is a bit up there,
but I might be able to drool myself into one.  Just
tried a search for the thread, but nothing yet.  In
the meanwhile, any clues as to the source for these?

Most of my gizmos usually have one PIC in it, and
occassionally, 1 or 2 more chips.

The clamp thing sounds nice though... wonder if I
can rube goldberg something?  :-)

Cheers,
-Neil.




{Original Message removed}

2002\05\31@071454 by Olin Lathrop

face picon face
> Someone (Olin or Bob Ammerman I think) listed a site that has tons of
> adapters for programming.

I have bought several adapter sockets for Picstart+ programmers from
Emulation Technologies, (800) 232-7837, http://www.1800adapter.com.  I also have
EDI, (702) 735-4997, listed as a source, but I don't think we every bought
anything from them.


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2002\05\31@075453 by Drew Vassallo

picon face
>I have bought several adapter sockets for Picstart+ programmers from
>Emulation Technologies, (800) 232-7837, http://www.1800adapter.com.  I also

That's the place!  Be careful you select the right adapter, though.  They're
listed by PIC number, so it's pretty straightforward, but they do have a LOT
of different SOIC adapters.

--Andrew

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2002\05\31@112146 by Pic Dude
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Oh wow -- that's nice, but $75... ouch!
In the meanwhile, I came up with a little design last night.
It was an exercise in how I could get this done with stuff
I have laying around the house...
       http://www.avn-tech.com/stuff/SOIC-Adapter.jpg

Not a perfect picture (scanner dead, so had to use a
camera), but it's legible.  Think I'll try to build one
this weekend.

Cheers,
-Neil.




{Original Message removed}

2002\05\31@124355 by Chris Loiacono

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Nice concept, simple design. Admittedly it would be great to build it and
see it work.
I have made a similar tool for small-pitch hot-bar tabs on cell-phone COG
LCD's. It was worthwhile because there was no such adapter available off the
shelf and the home-made tool worked great. However, it took way too many
hours to do accurately, and I would definitley sell one of the extra TV's,
printers or old PC's to raise cash in order to buy a ready made part, if
available.

But then again, you may have lots of spare time....or it may help you make
millions.....that would be another story....

c

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2002\05\31@124537 by Drew Vassallo

picon face
>It was an exercise in how I could get this done with stuff
>I have laying around the house...
>         http://www.avn-tech.com/stuff/SOIC-Adapter.jpg

Note: you'll need a LOT more downforce on the pins than those rubber bands
can provide.  Even pushing with your fingers is tough because you have to
literally flex any pin that isn't precisely aligned with all the other pins
into position.  It takes a good 5-10 pounds of force on the pins to really
ensure they're seated.

If you've ever used a real SMD socket, you'll notice that the force required
to close the lid is quite high... the force transmitted to the pins
themselves is tremendous.

--Andrew

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2002\05\31@125507 by Pic Dude

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face
Never seem to have enough time, but then again, I have
more of that to spare than money right now :-)  The
key here is that I don't really NEED to use an SOIC
chip in anything -- I just WANT to, so build a little
device like this is part of the hobby itself.

If I works out, I'll post pics/details.

Cheers,
-Neil.



{Original Message removed}

2002\05\31@125942 by Pic Dude

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face
Good to know.  I was thinking of running the copper
traces to only the pins I need to program the 16F872.
That would put more force on just those pins.  However,
that would limit me to just that device.

I'll experiment with different strengths of rubber-bands,
springs, etc.  Also have some C-clamps and a large vice :-)

Cheers,
-Neil.



{Original Message removed}

2002\05\31@140551 by SM Ling

picon face
> In the meanwhile, I came up with a little design last night.
> It was an exercise in how I could get this done with stuff
> I have laying around the house...
>         http://www.avn-tech.com/stuff/SOIC-Adapter.jpg
>
> Not a perfect picture (scanner dead, so had to use a
> camera), but it's legible.  Think I'll try to build one
> this weekend.

Look for Aries #44-547-11, universal soic and others adapter.  Well worth
the money I think at US128.  With right wiring, you can re-use it for many
type of programmers, chips, etc.

DigiKey stocked it.
http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=43&M=44-547-11

Cheers, Ling SM

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'[PIC]: Anyone used this device before?...'
2002\06\04@085519 by Drew Vassallo
picon face
>Here's some part # references and prices from the above site (looks like
>these are Contact East's part #'s) for the Pomona SOIC CLIP's:
>
>122-760 (28) $20.30

Why spend $20 and fabricate a makeshift device with limited application,
compensate for its use by forcing the PIC to be soldered independently to
the board prior to programming, then risk possible programming problems by
having the clip slip off midstream?

I'd recommend scraping up the additional $55, save yourself the time,
effort, and headaches, and buy a REAL adapter from http://www.1800adapters.com.

Just my $.02.

--Andrew

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2002\06\04@184255 by Pic Dude

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Why?  Cause I'm (a) a hobbyist, (b) unemployed, (c)
using SOIC's just for the hell of it.  No real need
to otherwise.  Based on these parameters, low-cost
becomes a major factor.  If I ever go commercial,
I'll be sure to pick up the right part.

Cheers,
-Neil.



{Original Message removed}

2002\06\04@185749 by mike

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face
Actually, I often find clip-over test clips with short ribbon cables
to a DIP header to be easier to use and more reliable than 'proper'
programming sockets for SO devices, especially for smaller sized
devices (8 pin) - also, two clips (wide & narrow) covers most package
widths, so a clip or two can cover a LOT of different device types.

On Tue, 4 Jun 2002 17:41:18 -0500, you wrote:

{Quote hidden}

>{Original Message removed}

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