Author Topic: connecting traces on opposite sides of a double sided board  (Read 11073 times)

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Offline GeoffS

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Re: connecting traces on opposite sides of a double sided board
« Reply #25 on: December 11, 2010, 06:17:04 am »
Very interesting -- that's many more steps than I've seen typical DIY kits use, and the results look good, though it looks like you have to drill twice (once beforehand, once with the cured paste).

I didn't pick that up on the first time through. Could be a real pain for a complex board.
 

Offline tyblu

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Re: connecting traces on opposite sides of a double sided board
« Reply #26 on: December 11, 2010, 06:36:05 am »
I only assume that because otherwise you wouldn't be able to see the pads well enough to drill accurately with the cured paste, and his example board looks like it has small features. You could restrict it to vias, too, skipping TO pkg and mounting holes (though may want them for strength).
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Offline mikeselectricstuff

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Re: connecting traces on opposite sides of a double sided board
« Reply #27 on: December 11, 2010, 04:45:15 pm »
You can try these track pins:

http://pt.farnell.com/harwin/t1559f46/track-pin-0-84mm-pk500/dp/1143874?Ntt=1143874

Thes track pins are definitely the way to go - very quick - just insert & snap off in each hole, go round then soldering both sides. Solder the top (wide) end first, while pushing down with the iron quite hard - this helps wedge them in, so the pin doesn't pop out when soldering on the underside.

For small holes down to 0.6mm OD, Mega do these rivets, which are quite useable without the press tooling - just use fine-point tweezers to drop them in the hole solder then solder the underside.
« Last Edit: December 11, 2010, 04:49:19 pm by mikeselectricstuff »
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Alex

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Re: connecting traces on opposite sides of a double sided board
« Reply #28 on: December 13, 2010, 10:30:48 am »

while pushing down with the iron quite hard


Doing so will damage the tip's iron plating accelerrating its destruction. It is best to do any mechanical work before soldering surfaces together.
 

Offline mikeselectricstuff

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Re: connecting traces on opposite sides of a double sided board
« Reply #29 on: December 13, 2010, 01:44:41 pm »

while pushing down with the iron quite hard


Doing so will damage the tip's iron plating accelerrating its destruction. It is best to do any mechanical work before soldering surfaces together.
Use a big tip. It's easiest to do it with the iron so it softens the PCB material as it goes in - the heat means you don't need anywhere near as much pressure as if doing it cold - not enough to cause damage - the pins are softer than the tip plating.
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Offline scrat

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Re: connecting traces on opposite sides of a double sided board
« Reply #30 on: December 13, 2010, 04:52:49 pm »
About vias, I've used the LPKF polymer paste, works well, it's quite simple.
As drawback, it is not very resistant (don't heat up it too much, like while soldering and desoldering many times), and it can cause shorts if you don't work precisely and...it costs! I think a single packet (3-4 small boards) costs about 5euro.

I confirm 0805 passives (and SOIC ICs, too) are handy, better than TH, IMHO.

EDIT: ...SMT is easy to work with...provided that you have desoldering tweezers or at least two soldering irons.
« Last Edit: December 13, 2010, 04:56:14 pm by scrat »
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Offline osmosis321

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Re: connecting traces on opposite sides of a double sided board
« Reply #31 on: December 14, 2010, 04:33:14 am »
Do you know this method:
http://www.youritronics.com/double-layer-pcb-home-made-vias/

I don't know if he did, but I didn't, and it was beautiful.  Thanks for that.
 


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