Thread: SMD-How to guide?
Following on from another thread I think that using smd components will be very usefull.
Anyone else use them? what are the advantages/ disadvantages?
Advantages are they are all of a uniform size for same value or component, have no leads to cut or bend and tend to lie nearly flush which gives most of the disadvantages they are not easy to solder on as they are small having very little in the way of packages or leads.
They are also designed to be flow soldered in that they are glued to the board and then flow soldered by machine but it can be done if you have the right tools and a steady hand.
As I have some SMD soldering to do soon (Shumatech DRO-350 upgrade), any information, pointers, warnings etc would be welcome.
do a web search it will bring up some interesting ideas.
This one is for the expert
Run the video
Notice the extra equipment (microscope these bits can get small) if you are serious about smd but usually for the odd resistor or capacitor a good soldering iron will suffice.
You can hand solder .05" pitch.
I usually tack one pad in each corner then melt and jiggle until everything lines up. Finest soldering iron bit, 26swg multicore, wipe the bit regularly so the solder can't build up enough for a blob.
Finer pitches for hand assembly you need a hot air blow gun, not butane powered, and solder paste...
If it's small enough to melt all the pads simultaneously, tin the pads, remove any bridges then apply the component. Surface tension will pull it in to place when everything is molten.
Too big to melt all at once, tack two corners, apply paste and run the hot air gun down the line. If adjacent pins bridge apply excess solder then grab your recoil less solder sucker. You do have a recoil less solder sucker, don't you?
Tin lead solder, ROHS be blowed. It must measure something if it's CNC, measuring instruments are exempt
I use the same technique as the 0.05" pitch (2nd video above is really using the same technique as wave soldering), but then the braid cleans up the shorts that you inevitably get (wave soldering's only really good for 0.8mm and above).
If you do use the 2nd video link, then it does take a bit of guts to do it the first time (best to practice!), and it works really well if you have solder resist on your board (I don't, but it's still okay - especially with desolder braid to clear up the mess!).
Last edited by tribbles; 16-08-2009 at 03:25 PM.
I do .025" but it ain't pretty :whistling:
That guy in the 2nd vid makes it look so easy.....
Has anybody made the hot air gun from the first link?
You do have a recoil less solder sucker, don't you?
Last edited by Ross77; 16-08-2009 at 08:45 PM. Reason: spelling again
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