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Homebrew_PCBs@yahoogr...
Dec 1, 2004 8:21 am
7730
Just repeated the temperature measurements using a different thermocouple. Temperatures at one inch from the end of the rollers are in the 285 F to 290 F...
Hi there, I'm new to etching PCBs and to the group. Faced with some pretty tarnished copper clad I took the same approach that I use for cleaning copper...
Not lemon juice, but citric acid was a common antitarnish when stripping print and etch innerlayers in caustic. Amines work better as an antitarnish, but they...
... I'm having a hard time stopping freshly electroplated copper from tarnishing when the panels dry. The cause cannot be a sulfuric acid residue problem since...
In commercial shops copper was almost always pattern plated followed by tin, tin/lead, or in the case of HP, nickel gold plating. If you wanted solder mask...
... by tin, tin/lead, or in the case of HP, nickel gold plating. If you wanted solder mask over bare copper the tin plating was stripped after the base copper...
Thanks for the information. I tried a couple more boards and this time skipped the rubbing alchohol wipedown after the lemon juice scrub. It may have helped...
... Thanks for the tips Earl, I do not know what the ingredients are in the brightening additives I'm using, but they don't seem to help the tarnish problem at...
We often used citric acid as an anti tarnish after electroless copper. The dry film was applied on the scrubbed copper surface and then went on to dry film...
This weeks Office Max flyer has a 9" GBC laminator for $30. This may not be the 200 model that we've discussed. But this is a GBC and not one of the clones. So...
... may ... not ... I'm pretty sure it will work just fine. Hopefully the modification instructions are close enough. Probably are but you never know. If ...
I am about to make some printed circuit boards using a laser printer, the Pulsar transfer film and an H200 laminator. Do I need to use toner reactive film or...
Kim Lux
lux@...
Dec 5, 2004 8:00 pm
7742
Hi, toner transfer for compoent legend doesn't work well on single-sided boards. The surface is too shiny. Until now i only used it on areas where i etched...
Looking for people who need PCBs or Prototype Manufacturing I would like to connect with people who need Printed Circuit Boards or Electronics Prototype...
I just joined this group today and noticed that no one has mentioned the Sharpie Industrial pens in the message archive. IT HAS TO BE THE *INDUSTRIAL* VERSION....
a couple of questions: - what is the width of the line produced by the fine point tip? ultrafine? - what are the wear characteristics? I assume the tip widens...
... may ... not ... Just purchased one of these, works like a champ, at least on the 2" by 1" board I tested. I gave it about 10 passes after letting the unit...
Hi everyone. I decided i do need some sort of agitation for my etcher. i tried moving the board, it works well but tends to shake to board loose of the holder....
Hi Stefan, You can make holes in a plastic tube but they need to be very small. I used a small pin that I heated up with a candle flame. If you use the pin...
... I've got a rectangular stone, about 10 cm long. Haven't tried it with an air pump, though. I find that contnuous manual agitation of the etchant container...
... I get lines of 0.025" max. Thinner lines are possible with less pressure but 25 mill works fine for me. ... After a few dozen boards I notice little wear....
Think & Tinker has some suggestions regarding bubblers at http://www.thinktink.com/stack/volumes/voliii/equipment/bubltank/bublt ank.htm . Lyman ... ...
... Oh well, that's way too coarse for me. too bad, I found a used plotter for $10. ... you may have gone on about the characteristics but that doesn't/didn't...
On Tue, 07 Dec 2004 17:01:00 +0000, Leon Heller <leon_heller@...> ... My container is unsuited for moving it. also it takes longer with my CuCl if i...
... thanks. and here is was wondering how i could produce very small holes, for very small bubbles. It seems larger is OK, though small would be better for...
I've had the same problem toner transferring component legends on single sided boards. My solution was to first give the legend side a light coat of Krylon...
I found a heated pin produces pretty large holes and, thus, pretty large bubbles. I used a #69 drill bit to get much smaller holes but would prefer even...
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