HI, Neil.

We use a 8 pin version of this method to program 12C508's in porduction for
small quantities.

I found that the Pomona clip was easier to use, lasted longer, and gripped
better. If they have  28 pin version, I'd be sure to check it out.

Mark

P.S. We get them from Contact East. www.contacteast.com Try part # 122-760.
I'm not sure if this is Pomona or CE part #.



----- Original Message -----
From: "Brett Walach" <brett@CONTROLS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, June 02, 2002 5:17 PM
Subject: Re: [PIC]: Anyone used this device before?...


> > 3M SOIC Wide Test Clip, 28-Pin, Alloy (923660-28).
> > Can't find a picture anywhere on digikey's site nor
> > 3M's site.
> >
> > This is (allegedly :) a test-clip that will clamp
> > around the pins of an SOIC chip.  I'm thinking of
> > using it as a simple way to program 16F872-I/SO
> > chips.  I'll solder the chip in first, clip this
> > on (with the appropriate wiring to my Tait
> > programmer), slap the code on, and build the rest
> > of the circuit.
>
> Hi Neil,
>
> We use these at work with our Promate II and a 28 pin DIP socket adapter
(3M
> clip -> 5 ICSP wires -> 28 pin DIP socket -> Promate II's 28 pin DIP
socket
> adapter). They work good for low current (Vdd) applications, but they also
> have some issues. The force of the clip is extremely high...I've often
> thought of removing the spring and cutting a 1/4 coil off of it. The clip
is
> designed to grab between the pins on an SOIC part and grab the under side
of
> the plastic body. Unless you use a minimal amount of solder on the pins of
> the IC, the clip has a tendency to "pop off" due to it not being able to
get
> between the pins and under the part. If this happens, you can still use
> it...you just have to hold it on there. There are wirewrap pins on the top
> of the clip, which is also where you press to open it. Due to the high
force
> of the spring, they tend to dig in to your fingers. And if the clip wants
to
> pop off you also have to press down with an equal amount of force to keep
> the clip on the pins.
>
> Bottom line is, this clip is a good solution. You just have to baby the
clip
> (and your fingers) to get it to work properly.
>
> Sincerely,
> Brett Walach
>
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