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'[EE] What do you guys think about this solder past'
2010\03\24@161546 by solarwind

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My friend showed me this website (dealextreme) where you can find all
kinds of stuff at low prices. So the first thing I found (I don't know
how), was this: http://www.dealextreme.com/details.dx/sku.4711. What
do you guys think? Too good to be true? Too cheap? Too expensive?

2010\03\24@165216 by Mark Rages

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On Wed, Mar 24, 2010 at 3:15 PM, solarwind <spam_OUTx.solarwind.xTakeThisOuTspamgmail.com> wrote:
> My friend showed me this website (dealextreme) where you can find all
> kinds of stuff at low prices. So the first thing I found (I don't know
> how), was this: http://www.dealextreme.com/details.dx/sku.4711. What
> do you guys think? Too good to be true? Too cheap? Too expensive?

I've used it.  Works well.

This one seemed to go on a little better:
http://www.dealextreme.com/details.dx/sku.7952

Regards,
Mark
markrages@gmail
--
Mark Rages, Engineer
Midwest Telecine LLC
.....markragesKILLspamspam@spam@midwesttelecine.com

2010\03\24@165709 by Vitaliy

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solarwind wrote:
> My friend showed me this website (dealextreme) where you can find all
> kinds of stuff at low prices. So the first thing I found (I don't know
> how), was this: http://www.dealextreme.com/details.dx/sku.4711. What
> do you guys think? Too good to be true? Too cheap? Too expensive?

Did you read the comments on that page? I would trust actual user feedback
more than any speculative answer.


2010\03\24@171125 by Bob Blick

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On Wed, 24 Mar 2010 16:15:26 -0400, "solarwind" said:
> My friend showed me this website (dealextreme) where you can find all
> kinds of stuff at low prices. So the first thing I found (I don't know
> how), was this: http://www.dealextreme.com/details.dx/sku.4711. What
> do you guys think? Too good to be true? Too cheap? Too expensive?

Dealextreme is awesome! Their consumer products are typical eBay quality
but the raw parts are OK.

Delivery time is pretty long because it comes from China.

Cheerful regards,
Bob


--
http://www.fastmail.fm - Faster than the air-speed velocity of an
                         unladen european swallow

2010\03\24@183830 by Peter Loron

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It works pretty well. Note that it is thick and sticky...you will need to cut this with some flux if you are going to use a syringe. I've so far just used it by dabbing it on with an applicator.

-pete


On Mar 24, 2010, at 1:15 PM, solarwind wrote:

> My friend showed me this website (dealextreme) where you can find all
> kinds of stuff at low prices. So the first thing I found (I don't know
> how), was this: http://www.dealextreme.com/details.dx/sku.4711. What
> do you guys think? Too good to be true? Too cheap? Too expensive?
> --

2010\03\24@184438 by solarwind

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On Wed, Mar 24, 2010 at 4:52 PM, Mark Rages <markragesspamKILLspamgmail.com> wrote:
> I've used it.  Works well.
>
> This one seemed to go on a little better:
> http://www.dealextreme.com/details.dx/sku.7952

Thanks, I'll buy that one then. How long do they typically last in the
fridge? Also, is it reasonable to apply evenly across the surface
mount pads on the PCB (so that the paste bridges the pads) and simply
heat it with a hot air gun? Will the paste "unbridge" itself or will
it melt and stay bridged?

2010\03\24@190237 by AK

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I have used the 'mechanics' paste from DX for a number of projects and
it works well.  It's been in the fridge about 1 year and still comes
from a syringe needle after warming it up, but is noticeably more
viscous than when new.  The solder paste does unbridge itself and
center small components with surface tension.  Don't use an excessive
amount on the pads and you should be OK.  The best way to apply it is
to cut a stencil from transparency film, or have one made, but for
one-offs syringe application can be sufficient.

On Wed, Mar 24, 2010 at 6:44 PM, solarwind <.....x.solarwind.xKILLspamspam.....gmail.com> wrote:
{Quote hidden}

>

2010\03\24@190625 by Bob Blick

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On Wed, 24 Mar 2010 18:44:18 -0400, "solarwind"> said:

> Thanks, I'll buy that one then. How long do they typically last in the
> fridge? Also, is it reasonable to apply evenly across the surface
> mount pads on the PCB (so that the paste bridges the pads) and simply
> heat it with a hot air gun? Will the paste "unbridge" itself or will
> it melt and stay bridged?

Paste that has been around for a few years will still work fine for
hobby use. In a professional situation where you are using a stencil,
the consistency is way more important and you need fresh paste. In that
case you would also probably be buying name-brand paste.

For IC's, rather than applying paste to the board, apply it to the part.
Put some paste on a mirror and spead it with a credit card until you get
a thin film of it, then scrape the legs of one side of the IC on that
film until you get enough paste on the legs, then repeat for the other
legs. You can tolerate a small amount of paste bridging the leads,
unless you use way too much solder you won't get hard shorts but you
will get stray balls of solder all over the place.

Cheerful regards,

Bob


--
http://www.fastmail.fm - Access your email from home and the web

2010\03\24@195915 by M.L.

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On Wed, Mar 24, 2010 at 7:06 PM, Bob Blick <bobblickspamspam_OUTftml.net> wrote:

> For IC's, rather than applying paste to the board, apply it to the part.
> Put some paste on a mirror and spead it with a credit card until you get
> a thin film of it, then scrape the legs of one side of the IC on that
> film until you get enough paste on the legs, then repeat for the other
> legs. You can tolerate a small amount of paste bridging the leads,
> unless you use way too much solder you won't get hard shorts but you
> will get stray balls of solder all over the place.
>
> Cheerful regards,
>
> Bob

Bob, thanks for the tip I will try this the next time I'm soldering a
many-pin part. I wonder if I could get this to work for a QFN?

--
Martin K.

2010\03\24@200409 by solarwind

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On Wed, Mar 24, 2010 at 7:06 PM, Bob Blick <@spam@bobblickKILLspamspamftml.net> wrote:
> Paste that has been around for a few years will still work fine for
> hobby use. In a professional situation where you are using a stencil,
> the consistency is way more important and you need fresh paste. In that
> case you would also probably be buying name-brand paste.
>
> For IC's, rather than applying paste to the board, apply it to the part.
> Put some paste on a mirror and spead it with a credit card until you get
> a thin film of it, then scrape the legs of one side of the IC on that
> film until you get enough paste on the legs, then repeat for the other
> legs. You can tolerate a small amount of paste bridging the leads,
> unless you use way too much solder you won't get hard shorts but you
> will get stray balls of solder all over the place.

Thank you AK and Bob for the suggestions. I will try that for sure. I
will be soldering very small QFN packages (CC1101 chips from Texas
Instruments).

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