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Old 19th September 2003, 10:51 AM   #11
ALW is offline ALW  United Kingdom
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Join Date: Jun 2001
Location: UK
Default Tips for soldering

Here's some tips that may be of use to you guys re: SMD soldering.

Soldering SMD is a bit like designing audio - what one thinks will work and has been told through years of education and experience is often wrong, so here's Andy's top tips for S&MD success: -

1. Buy a flux rework wand

These are a large felt tip pen, filled with rework flux - get a no-clean one for less mess

2. Don't use tiny soldering iron tips

Trying to solder each pin of an SOIC individually is a waste of time, and very fiddly, the technique to use means use of a surprisingly large soldering iron bit, preferably a 'horses hoof' shaped one of the sort you'd use for ordinary precision leaded soldering. Something about 3-4mm wide is perfect.

3. Use the 'drag soldering' technique

No, not dressing up in your wife's clothes (although if you feel comfortable, then who am I to argue...) but a technique where we throw out the first golden rule of soldering, i.e. that of applying solder to the joint, not the soldering iron.

Well, with SMD that's not the way to do it, so here's a better way, that sounds like a recipe for disaster, but once mastered will have you fitting SOIC's quicker than the time it takes to find your cutters to clip the legs on a standard DIP package

The reason for golden rule no.1 is that the flux evaporates / burns off once the solder is applied to the iron. Being the intelligent and thoughtful bunch that all DIY.com'ers are, you will have heeded no.1 above and bought a flux wand.

Here's the secret, please listen carefully, I will repeat this only once ...

1. Apply flux to land pattern of PCB.

2. Place device accurately on pads, and check the orientation

3. Check the device orientation again

4. Hold the device on the pcb using a suitable tool, by applying pressure from the top (tweezers, screwdriver, all work well).

5. Dab some more flux on the legs of one side of the device, make sure you don't move it - if you do, realign it.

6. Take your iron in your free hand, apply a nice dollop of solder to the tip.

7. Apply the iron to the first leg you've applied flux to and drag the tip along one side, spending about 0.5s per leg, until you reach the end. Don't worry about shorts, poor joints or anything at this phase

8. Repeat 5, 6 and 7 on the other side of the device.

9. Have a good look, you will have either: -

a. Perfectly soldered joints down both sides

b. Shorts between some legs

c. Unsoldered legs

d. A mixture of b and c

10. If you have b / c, then simply apply more flux to the offending side of the IC, and drag a clean iron tip along the entire side as before - the iron will now pick up excess solder and you should get perfectly soldered joints, indistinguishable from those done by a production reflow method.

If any joints need a bit more solder, repeat 10, but add a small dab of solder to the iron first.

It sounds scary and takes a few tries to get right, but works really well, with a bit of practice you'll get the hang of it, and it's real quick and reliable to do.

Andy.
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Old 19th September 2003, 10:52 AM   #12
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Default Re: import-stuff

Quote:
Originally posted by cdl
Just to say that my Browndog adaptors arrived today, everything in the package etc. etc.

BUT I had to pay 35% surcharge... for stupid danish import taxes & "customs handling charges"!!!!!! Dammit .

Sometimes, I sure do hate this self-content, self-sufficient, overpriced and overrated little narrow-minded country .

Well... after all still cheaper than Farnell's adapters at least.

Cheers,

cdl
Hi cdl.

35%???
Here we pay 19%
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Old 19th September 2003, 11:17 AM   #13
cdl is offline cdl  Denmark
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Join Date: Aug 2003
Location: Copenhagen
ALW, thank you very much for your tips on SMD soldering - I will definately follow your advice!

Well, Elso, technically it's "only" 25% taxes, but the rather hefty customs handling fee is added to that, sooo - all in all it turned out 35% of the 70$ worth of adapters I ordered - almost as outrageous as our 50% income tax rate

B.T.W. I am very interested in your clock, so once I finish messing around with my preamp...!

/cdl
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Old 19th September 2003, 11:26 AM   #14
Zombie is offline Zombie  Sweden
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Join Date: Feb 2003
Location: At home
I offer my condoleances!
Don't you have a lower limit where import for private persons is free, like 1000 DKK or smth?
t.
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Old 19th September 2003, 11:46 AM   #15
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Join Date: May 2001
Location: London UK
Default Re: import-stuff

BUT I had to pay 35% surcharge... for stupid danish import taxes & "customs handling charges"!!!!!! Dammit .

Sometimes, I sure do hate this self-content, self-sufficient, overpriced and overrated little narrow-minded country .

-----------------------------------------------------
That is why I advised earlier to phone up and ask them to send as samples by air postage.

The only thing about the adaptors is the VERY thin traces.
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Old 19th September 2003, 12:05 PM   #16
Bricolo is offline Bricolo  France
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Location: Grenoble, FR
Default Re: Tips for soldering

Quote:
Originally posted by ALW
Here's some tips that may be of use to you guys re: SMD soldering.

Soldering SMD is a bit like designing audio - what one thinks will work and has been told through years of education and experience is often wrong, so here's Andy's top tips for S&MD success: -

1. Buy a flux rework wand

These are a large felt tip pen, filled with rework flux - get a no-clean one for less mess

2. Don't use tiny soldering iron tips

Trying to solder each pin of an SOIC individually is a waste of time, and very fiddly, the technique to use means use of a surprisingly large soldering iron bit, preferably a 'horses hoof' shaped one of the sort you'd use for ordinary precision leaded soldering. Something about 3-4mm wide is perfect.

3. Use the 'drag soldering' technique

No, not dressing up in your wife's clothes (although if you feel comfortable, then who am I to argue...) but a technique where we throw out the first golden rule of soldering, i.e. that of applying solder to the joint, not the soldering iron.

Well, with SMD that's not the way to do it, so here's a better way, that sounds like a recipe for disaster, but once mastered will have you fitting SOIC's quicker than the time it takes to find your cutters to clip the legs on a standard DIP package

The reason for golden rule no.1 is that the flux evaporates / burns off once the solder is applied to the iron. Being the intelligent and thoughtful bunch that all DIY.com'ers are, you will have heeded no.1 above and bought a flux wand.

Here's the secret, please listen carefully, I will repeat this only once ...

1. Apply flux to land pattern of PCB.

2. Place device accurately on pads, and check the orientation

3. Check the device orientation again

4. Hold the device on the pcb using a suitable tool, by applying pressure from the top (tweezers, screwdriver, all work well).

5. Dab some more flux on the legs of one side of the device, make sure you don't move it - if you do, realign it.

6. Take your iron in your free hand, apply a nice dollop of solder to the tip.

7. Apply the iron to the first leg you've applied flux to and drag the tip along one side, spending about 0.5s per leg, until you reach the end. Don't worry about shorts, poor joints or anything at this phase

8. Repeat 5, 6 and 7 on the other side of the device.

9. Have a good look, you will have either: -

a. Perfectly soldered joints down both sides

b. Shorts between some legs

c. Unsoldered legs

d. A mixture of b and c

10. If you have b / c, then simply apply more flux to the offending side of the IC, and drag a clean iron tip along the entire side as before - the iron will now pick up excess solder and you should get perfectly soldered joints, indistinguishable from those done by a production reflow method.

If any joints need a bit more solder, repeat 10, but add a small dab of solder to the iron first.

It sounds scary and takes a few tries to get right, but works really well, with a bit of practice you'll get the hang of it, and it's real quick and reliable to do.

Andy.

And what about smd desoldering?
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Old 19th September 2003, 12:10 PM   #17
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Default Re: Re: import-stuff

Quote:
Originally posted by fmak
BUT I had to pay 35% surcharge... for stupid danish import taxes & "customs handling charges"!!!!!! Dammit .

Sometimes, I sure do hate this self-content, self-sufficient, overpriced and overrated little narrow-minded country .

-----------------------------------------------------
That is why I advised earlier to phone up and ask them to send as samples by air postage.

The only thing about the adaptors is the VERY thin traces.
Fmak,
Almost all these firms refuse to send by USPostal Service but send by UPS (Brrrrrrrrr) or Fedex.
I just received two 125 MHz oscillators, worth 26 US$, from Vite on Line PLUS US$ 40 for shipping and handling. Lucky for me the invoice in it only mentioned the goods so I did not pay any taxes.
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Old 19th September 2003, 12:33 PM   #18
ALW is offline ALW  United Kingdom
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Join Date: Jun 2001
Location: UK
Default Desoldering

Quote:
And what about smd desoldering?
For that you need special tools

For 8-pin SOIC though just flood one side with solder and lift, the repeat for the other side.

The key is loads of solder - lift a pad and you're stuffed, even with bent legs the SOIc could be re-fitted, if not broken.

The board is a little harder to replace

These are my favoured tools: -

www.metcal.com

Andy.
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Old 19th September 2003, 01:34 PM   #19
cdl is offline cdl  Denmark
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Join Date: Aug 2003
Location: Copenhagen
Fmak is right, maybe we could convince Browndog to quote those small numbers we are ordering as free samples, stating that the fee they charge is only for shipping and handling. In that way, I guess taxes wouldn't be imposed.

Now that BrownDog are so friendly as to send by US airmail

/cdl
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Old 19th September 2003, 03:09 PM   #20
diyAudio Member
 
Join Date: May 2001
Location: London UK
Default Re: Re: Re: import-stuff

[QUOTE]Originally posted by Elso Kwak
[B]

Fmak,
Almost all these firms refuse to send by USPostal Service but send by UPS (Brrrrrrrrr) or Fedex.
----------------------------------------------------------------
Not true, you need to talk to them and explain why. Just don't order from people who are so inflexible that they can't see. Even Partsconnexion has changed.
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