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What method of soldering do you use. I have done some research on
this and found many ways but none seem reasonable.
I can make the boards but have not figured a way to solder them.

Thanks
Ken Smith

--- In Electronics_101@..., "Kenneth Smith"
<kensmith52@y...> wrote:

What method of soldering do you use. I have done some research on
this and found many ways but none seem reasonable.
I can make the boards but have not figured a way to solder them.

Thanks
Ken Smith

What do you mean, unreasonable?

You apply solder to the two pieces of metal you want to stick together.

As for the exact methods of how to hold the soldering iron, etc...it's
one of those things that could take pages to explain in words, but are
self-taught within the first few minutes if you simply TRY.

On Sat, 17 Apr 2004 13:53:45 -0000, Kenneth Smith <kensmith52@...> wrote:

What method of soldering do you use. I have done some research on
this and found many ways but none seem reasonable.
I can make the boards but have not figured a way to solder them.

Thanks
Ken Smith

method a) soldering iron - works only to a certain spacing.
method b) hot air pencil
method c) oven

method b and c require the use of solder paste, containing solder and flux.

ST

开云体育

When I finally worked up to courage (yes, its intimidating) to try
SMDs, I read everything that google could find. There are a bunch of
techniques but you dont need to invest in expensive equipment. I
bought a decent temp controlled station (90-ish $$ but you can find
good enough for even 1/2 that) and just tried. I made a practice
board with a bunch of pads (1206s, 805s, sot23, and several sizes of
SOICs). I bought a grab bag of parts and a couple of the cheapest
SOICs I could find (lots on ebay but mouser/digikey/... all have
them). All in I spent less than $10 for the test parts and have lots
left over. I got a super thin tip for my iron but found that the
size that came with it works just fine (is small but not THAT
small). In hindsight, I should have gone straight to a project.

I use the "tack a corner" approach and liberal flux. Put a small dab
of solder on a corner pad. Then holding the iron on side of the pad
to keep the solder melted I slide the part into place using
foreceps. Once in place I take the iron away and the part sticks
after a second. If its not right, I put the iron back and tweak the
position. Then I put a little dab of solder on the iron and touch it
to each lead - it flows in about 1 second. I can usually get 2-3
leads per dab of solder. I can do SOICs in about a minute. 1206s,
805s in 20 seconds or so. SOT23s are the trickiest for me but they
are pretty quick too. Sometimes you will get bridges but solder wick
does the trick.

I'm hooked and try to use SMDs where ever I can.

Phil

--- Phil <phil1960us@...> wrote:
I

bought a decent temp controlled station (90-ish $$
but you can find
good enough for even 1/2 that) and just tried. I
made a practice

I got a super thin tip for my iron but

found that the
size that came with it works just fine (is small but
not THAT
small). In hindsight, I should have gone straight
to a project.

I?ve only done one project so far with SMD it was a
kit for a microphone amplifier.
I got a new thin soldertip for my Weller wtcp (about 1
mm thick and some thin solder. And away I went, more
or less ordinary soldering technique. Maybe I was just
lucky, but I didnt have any problems at all. Next time
I will add a magnifier to the setup.
Henning




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I?ve only done one project so far with SMD it was a
kit for a microphone amplifier.
I got a new thin soldertip for my Weller wtcp (about 1
mm thick and some thin solder. And away I went, more
or less ordinary soldering technique. Maybe I was just
lucky, but I didnt have any problems at all. Next time
I will add a magnifier to the setup.
Henning

if the pin spacing is wide enough this works perfectly well, without needing luck.
I use this metod often with the mixed boards, with 1206 and 0805 components and wide
spaced chips.

I use colophony resin as a flux, solved in laquer thinner. it doesn't attack the
copper and actually acts as a protective laquer. i usually don't clean it off.
It is ok for the standard circuits, maybe for very high impedance things or very high
frequency it could be bad.
After all in a big number of solder wires this flux is used as the flux core so i think
it is not bad for the copper or components.


If you have a lot of parts or too small spacing it is very convenient to use a oven.
you apply the paste, ideally with a pneumatic dispenser that dispenses a precise amount
each time, then put all parts on with a vacuum pipette and put it in the oven.
the paste reflows, the parts align, ready.

The result looks just like any professional board you look at.

Bad thing is i have no oven and i have no pneumatic dispenser, both on the "to do" list.

ST

--- In Electronics_101@..., "Kenneth Smith"
<kensmith52@y...> wrote:

What method of soldering do you use. I have done some research on
this and found many ways but none seem reasonable.
I can make the boards but have not figured a way to solder them.

Thanks
Ken Smith

A tip given to me for SMD rework which I use for very fine pitch
TQFPs: smother the legs with solder then use de-solder braid to remove
the excess. It leaves the solder connecting the legs to the board but
removes all the short circuits.

Keith.

I also facing this problem everyday. i don't have any
special equipment. anybody have some idea pl give that
is very helpful
murugaiyan

--- Keith <keith@...> wrote:
---------------------------------
--- In Electronics_101@..., "Kenneth
Smith"
<kensmith52@y...> wrote:

What method of soldering do you use. I have done

some research on

this and found many ways but none seem reasonable.
I can make the boards but have not figured a way to

solder them.

Thanks
Ken Smith

A tip given to me for SMD rework which I use for very
fine pitch
TQFPs: smother the legs with solder then use de-solder
braid to remove
the excess. It leaves the solder connecting the legs
to the board but
removes all the short circuits.

Keith.



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