RE: [Homebrew_PCBs] Re: Asian toner transfer paper
2016-08-27 by Brad
Thanks! That’s what I was kind of thinking. My printer is not too wild about this stuff… even on heavy gloss setting it’s not putting quite enough
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Re: Asian toner transfer paper
2016-08-26 by soffee83@...
Brad- It should be the glossy one. I had awesome results with mine when I first got it (using an Apache laminator), but I broke the stuff out again recently to
Asian toner transfer paper
2016-08-26 by Brad
Bought a whack of this on ebay.. I m just wanting to check.. is it intended that you print on the dull side or glossy? Thinking it was like press n peel, I
RE: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by Kevin Byrne
Light bulb was a flop till I raised the length of time to 11 min in wood box under bulb approx. 12 in. I got two good to go tone control boards done today
RE: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by keith printy
We used the Kodak resist when I did it at work and I used the gc electronics spray at home. Used a sunlamp for about 5 minutes . I believe this included the
RE: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by Kevin Byrne
Datak states with their 300 watt ER-2000 bulb placed 12 above board 3 1/2 to 4 minutes for a small board, larger board sizes 5 X 5 and 9 X 9 raise light
RE: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by keith printy
I think I used to expose the photoresist for about 5 minutes under the sunlamp. I used glass to hold down my negative on the board. Has been a while since I
Re: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by Kevin Byrne
Thank you to all that replied to my questions. There seem to be a lot of differences in the amount of time board is under light. From one minute up to eight
Re: [Homebrew_PCBs] Re: First Negative developement Brd
2016-08-21 by Donald H Locker
He does so many things that I wouldn t recommend, though he does at least use gloves - NEVER handle the board like a sheet of paper (touching the surfaces) -
Re: First Negative developement Brd
2016-08-20 by alan00463@...
I haven t done UV photolithography myself, but recently watched Mr Scully s youtube video demo. of it, where he goes over all its steps in great detail.
OT - improved thermal pads
2016-08-19 by mosaicmerc@...
Hi guys: This is something I ve made for myself and it works quite well so I took it to Tindie. I hope the admin will permit me to post this here. It basically
RE: [Homebrew_PCBs] First Negative developement Brd
2016-08-19 by keith printy
When I used to expose the photo resist on the boards I used a sunlamp. I forget what the timing was though ,haven’t done this in many years. From:
Re: [Homebrew_PCBs] First Negative developement Brd
2016-08-19 by Malcolm Parker-Lisberg
Forgot to add, cover glass can absorbe the UV required by the film, so you may need to experiment with that also.. Malcolm I don t suffer from insanity I enjoy
Re: [Homebrew_PCBs] First Negative developement Brd
2016-08-19 by Malcolm Parker-Lisberg
Do a test exposure, cover the negative, on a piece of scrap board, and expose a strip for 10 seconds say, move card along to reveal an extra strip, expose and
First Negative developement Brd
2016-08-19 by kbyrne10@...
I finally have all the supplies that I need and need a question answered. Supplies Scotch Laminator Office depot Black and white copier transparencies. Two
Re: Preventing oxidation of copper outdoors
2016-08-09 by goofy_36@...
That s one thing I liked about where I went to college. Almost all of the professors had previous careers in industry or business, then went into teaching. So
Re: Technical History (Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors)
2016-08-07 by Malcolm Parker-Lisberg
Albert What you suggested comes from the free thinker that is you. Unfortunately most teachers aren t free thinkers, just trained Parrots, regurgitating the
Technical History (Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors)
2016-08-05 by hitekgearhead@...
When I was in college, I of course, like everyone else had to take history classes. I share the same sentiment with you on the subject. I had a history teacher
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-04 by Stefan Trethan
Will do, thanks. There are so many interesting engineers and scientists out there that shaped our world, and yet when I was at school all we learned about were
RE: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-04 by Tony Smith
... Have a read up on Clair Patterson (a bloke, not a woman) who first figured out maybe lead in everything wasn t such a good idea. That started when he was
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-03 by Malcolm Parker-Lisberg
What I like about this group is I regularly learn something new, or something more about something I knew a little of.. Malcolm I don t suffer from insanity I
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-03 by Stefan Trethan
To be fair to Mr. Midgley Jr., at least he did not use arsenic instead of lead, which according to his experiments also worked to eliminate knocking. ;-) On a
RE: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-03 by Tony Smith
... We need to build a giant statue of that dude, and let the pigeons crap all over it before we poison them. Then throw the dead pigeons at the statue. Tony
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-02 by Stefan Trethan
I always wanted to make some kind of heated metal paintbrush, but never got around to it. It must be heated to avoid the danger of lifting small traces if they
Re: Preventing oxidation of copper outdoors
2016-08-01 by Paul Alciatore
I find it hard to follow the complete threads here so forgive me if I am repeating something. If the question was how to prevent copper boards from oxidizing,
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Harvey White
... This might not be a problem when the slivers are near enough the pads to melt when soldering components. However, I like the idea of wiping off the melted
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Stefan Trethan
Air agitation worked quite well for me to move the etchant around. I think a peristaltic pump has very low flow rate, at least the small ones I m familiar with
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Harvey White
... I may try this, it seems lots better than immersion tin. Right now, I m in a software phase of development, much cheaper than making boards. Some boards
File - monthly.txt
2016-08-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Stefan Trethan
There you go again, poisoning the squirrels. I did something much like HASL when I still made boards, what you can do is you buy a can of plumbing solder paste
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Harvey Altstadter
Harvey, The name HASL is appropriate because it is a hassle. It requires special equipment. The boards are first solder dipped, and then passed between hot air
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Harvey White
... I think it is. It comes with lots of warnings, most of which involve the word poison . I use gloves and tongs, and wash the boards thoroughly. Also, this
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-08-01 by Stefan Trethan
RoHS allows 0.1% lead. I think this Liquid Tin is based on thiourea, something much, much worse than lead. Remember to wash your hands and wear a hardhat or
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Harvey White
... The MG chemicals solution contains brighteners that remove oxidization from the copper. (seen that) There is no guarantee that the coverage will be
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Brad Thompson
On 7/31/2016 2:39 PM, Harvey White madyn@dragonworks.info ... Hello-- Nope-- it s Tom Lehrer: https://en.wikipedia.org/wiki/Tom_Lehrer ..And the song
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Harvey Altstadter
Poisoning Pigeons in the Park is by Tom Lehrer Every Sunday you ll see... The other Harvey On 7/31/2016 11:39 AM, Harvey White madyn@dragonworks.info
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Stefan Trethan
Do wash your hands guys, who doesn t hate test equipment that is grubby around the switches and knobs. When you kick the bucket from lead poisoning and your
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Harvey Altstadter
Alan, My comments about spray have to do with vent holes only. No spray, no problem. If it is very warm inside when you bring the unit outside, you may get
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Harvey White
... Especially after you solder something? reminds me of poisoning pigeons in the park , I think by Spike Lee.. Harvey
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Stefan Trethan
You know frequent headaches are a symptom of lead poisoning... ;-) I m not entirely convinced about the data myself, but they made a pretty good case, since
RE: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by keith printy
Just so you know,if you bring something in from outside in winter you will get condensation until it warms up. That is why back in the vcr days they had a dew
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Stefan Trethan
The tin and solder will also be fine if it tarnishes, as long as there is no corrosion from actual moisture on the board. Only if there is moisture you need to
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Malcolm Parker-Lisberg
Harvey For toasted sandwhiches.............. Otherwise, hold the crust and feed that to the pesky Pigeons or Grey Squirrels. Malcolm I don t suffer from
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by alan00463@...
Thanks, Brad. I watched the NASA video. No, Harvey A., my circuit has no glass diodes, or other components that I know to contain glass. I am glad you
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Malcolm Parker-Lisberg
Stephan Maybe we should ask if you touch your wife then? ;-) Don t often, she always has a headache....... If I recall, There are Lies, Damn Lies and
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Stefan Trethan
Maybe we should ask if you touch your wife then? ;-) I think car batteries are actually the most recycled consumer item, more than 99% are recycled. I agree
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by casy_ch@tbwil.ch
Lovely answer Malcom! That reminds me a US ham having visited Switzerland with his young son not too much long ago and saying that they washed their hands at
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Malcolm Parker-Lisberg
Stefan Do you also prepare your food without touching? ;-) I don t prepare the food, the wife does that.... :~) I do think there is a lot of
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Stefan Trethan
Do you also prepare your food without touching? ;-) I don t worry much about the solid wire (although I do wash my hands of course), but the solder paste, and
Re: [Homebrew_PCBs] Preventing oxidation of copper outdoors
2016-07-31 by Harvey White
... What, including sandwiches? Harvey