Liquid Tin
2010-01-30 by jimofc300
Hi, A few questions regarding MG Chemical s Liquid Tin product: 1) I just purchased a bottle of Liquid Tin. In the bottom of the (unopened) bottle, there s a
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Re: sourcing appropriate UV tubes
2010-01-30 by James
... No, just buy a bunch of ballasts, they re cheap. Normally $5 or so, but a few months ago Home Depot had them marked down to 48 cents, and when I bought
Re: sourcing appropriate UV tubes
2010-01-30 by James
... Traditional blacklight tubes are made of Woods glass which filters out most of the visible light, as well as some of the UV. These are the deep purple
Re: [Homebrew_PCBs] Re: sourcing appropriate UV tubes
2010-01-30 by DJ Delorie
If you want to put a bunch of those tubes in an exposure box, do you have to cannibalize an equal number of generic flourescent fixtures too?
Re: sourcing appropriate UV tubes
2010-01-30 by jcarlosmor
... Do you need it only in 12-inch? A recommended and tested tube for many years has been F15T8BL, but in 18 inches.
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-30 by Simao Cardoso
... Just guessing but did you check either light intensity distribution (are you using the leds setup) but most important (what at least Adam Seychell calls)
Re: [Homebrew_PCBs] Re: Regenerated Sodium persulphate etchant (was Printed circuit board eyelets)
2010-01-30 by Simao Cardoso
... The patent i found is very difficult for me to read. Not easy for a chemistry ignorant and non English speaker. Thanks for posting yours findings. I get
Re: [Homebrew_PCBs] sourcing appropriate UV tubes
2010-01-29 by Leon Heller
... Farnell and RS stock them. Leon
Re: [Homebrew_PCBs] sourcing appropriate UV tubes
2010-01-29 by Larry Battraw
... Home Depot (And other chains like Lowes/Menards/etc.) carry 12-inch-ish U-shaped bug zapper bulbs. With a couple of those you re set and you get the
sourcing appropriate UV tubes
2010-01-29 by David Griffith
In my ongoing research to make a UV exposure box the Right Way, I come to the question of the tubes. Where is a good place to order 12-inch T8 tubes that emit
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-29 by DJ Delorie
... Thin glass plate with 3-8 in Hg vacuum. Holds it very tight against the PCB. ... Always do. ... I didn t have any luck with vellum, the laser printer
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-29 by Russell Shaw
... The power level from array LEDs is high. http://www.phoseon.com/ http://www.leduv.com/ http://www.jentonuvled.com/
Re: Regenerated Sodium persulphate etchant (was Printed circuit board eyelets)
2010-01-29 by boombox666
... I have used the exact same post as basis for my experiment, and I have talked with the poster (contacted him directly). I have found some patents on
Re: [Homebrew_PCBs] Re: Discussion on Toner Transfer Method
2010-01-29 by Stefan Trethan
I think the tape will be fine, doesn t have to last forever. I usually strongly dislike tape (because it leaves a mess) but this would be a good application.
Re: Printed circuit board eyelets
2010-01-29 by g3oou@aol.com
Hi All Many years ago Tucker Eyelets in the UK made a tinned copper eyelet type L762 that I used with DIL ICs and other leaded components. They still have the
Re: Discussion on Toner Transfer Method
2010-01-29 by James
... I suppose a scrap of copper or aluminum tubing would work as well. Duct tape tends to fall off over time. You might try foil tape, it can be found in the
Re: LEDs versus tubes
2010-01-29 by James
... What are you using to hold your film to the blank PCB? You have to make sure the printed side is against the board, and it has to be absolutely flat. Use a
Re: [Homebrew_PCBs] Re: Regenerated Sodium persulphate etchant (was Printed circuit board eyelets)
2010-01-29 by Simao Cardoso
... After sleep i give it a try, but instead a simple google search, i found what seems to be it, with google academic, going between references. Patent from
Re: LEDs versus tubes
2010-01-29 by James
... I never said they didn t. As I mentioned, there are multiple wavelengths emitted by the unfiltered blacklight UV tubes, the strongest being in the long
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-29 by DJ Delorie
... Would this affect etch-under at all? My latest board had trace thinning to the point where many were missing completely, I ve been bloating my films to
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-29 by Leon Heller
... PCBs require long wave UV which isn t absorbed by ordinary glass. Leon
Re: LEDs versus tubes
2010-01-29 by cunningfellow
... And intensity. A 60 second exposure with a UV tube will give harder edges to the resist than a 10 minute exposure with a lower intensity source. And
Re: LEDs versus tubes
2010-01-29 by James
... Fluorescent tubes emit light in sharp peaks of fairly specific wavelenghts. There are several peaks produced by the mercury vapor discharge itself, and
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-29 by Leon Heller
... Collimation. Leon
Re: [Homebrew_PCBs] Re: Regenerated Sodium persulphate etchant (was Printed circuit board eyelets)
2010-01-29 by Simao Cardoso
... Electric regeneration of sodium persulphate etchant is really possible? You do it like this?
Re: [Homebrew_PCBs] Re: LEDs versus tubes
2010-01-29 by Jack@coats.org
That makes sense. ... Thanks for the great explanation. Basically the quality (intensity and spectrum) of the UV is better. ... [Non-text portions of this
Re: Discussion on Toner Transfer Method
2010-01-29 by sailingto
Neat idea on the .45 cal brass to burn the hole - I was thinking of something along those lines - I think that might be what I try first. I really think I can
Re: LEDs versus tubes
2010-01-29 by jcarlosmor
... No, sorry but that is not the reason. A typical exposure UV unit for industrial use can cost USD$10,000.00 and that is just the beginning prices. Although
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-29 by Jack@coats.org
I wonder why that is? ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-29 by David Griffith
... I suspect too that light from a tube may be easier to diffuse. Another thing may be that there are fewer parts to go bad. Looking around town I see lots
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-29 by James Bishop
It might also have something to do with the UV wavelength. I think LEDs have a longer wavelength, close to purple, while the tubes might be further into the UV
Re: LEDs versus tubes
2010-01-29 by jcarlosmor
Since I know very very little about optics, I can not tell you a sceintific answer. However, the problem lies in how the light incide on to the superficial
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-29 by Trevor White
Hi. I have a feeling its because professional production have big 300mm x 400mm size panels and the number of LEDs in one unit just makes it too large. It
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-28 by Stuart Schaffert
... OK, I ll bite. Why do UV tubes give better resolution than UV LEDs? Stuart [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] LEDs versus tubes
2010-01-28 by Leon Heller
... Much better resolution is achieved with UV tubes. Leon
Re: Discussion on Toner Transfer Method
2010-01-28 by bebx2000
ken H, What you get with the Tool Kit is a soldering iron with a copper tip like a hole saw about 5/8 in diameter. You heat it up and hold it perpendicular to
LEDs versus tubes
2010-01-28 by David Griffith
Someone said that no professional board shops use ultraviolet LEDs. Why is that? -- David Griffith dgriffi@cs.csubak.edu A: Because it fouls the order in
Re: Printed circuit board eyelets
2010-01-28 by sailingto
WOW!!! Bob, you sure do come thru everytime I m in a lurch! I just hope I can repay in kind someday..... AND that dinner invite is ALWAYS open for some good
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-01-28 by Bob Huish
To Ken I might have some in the shop. I will try to get a picture off to you today. They are marked. :International Eyelets, Inc F-4093-c, F-6093-c Bob
Re: [Homebrew_PCBs] Re: Discussion on Toner Transfer Method
2010-01-28 by kabowers@NorthState.net
... One refill issue back to when the original laserjet/laserwriter was introduced was punching holes in the toner cartridge without getting plastic chips into
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-01-28 by Stefan Trethan
You can also try very small stranded wire ferrules (also called bootlace ferrules in the US). Even the smallest size might be too large for your purpose, but
Re: Printed circuit board eyelets
2010-01-28 by boombox666
A shop that sells bungard eyelets in smaller quantities is SMDshop in the netherlands: http://smdshop.nl/index.php?language=en
Re: [Homebrew_PCBs] Re: Discussion on Toner Transfer Method
2010-01-28 by Stefan Trethan
Any size hole melting and covering with strong adhesive tape should do. Remember the kit is so that even mechanically challenged people can refill, I m sure
Re: Printed circuit board eyelets
2010-01-28 by sailingto
Is there any place to get just a few eyelets to test out? Heck, even at 10 or 20 samples would keep me going for a while - I only make 2 to 4 boards/month -
Re: Discussion on Toner Transfer Method
2010-01-28 by sailingto
Baxter - The ReChargX Tool Kit - just what is this and is it really needed? I read it s a hot tool to melt the hole? Do they provide the plug with the toner
Re: [Homebrew_PCBs] Re: Discussion on Toner Transfer Method
2010-01-27 by Stefan Trethan
What I ve done is look for private one-off sales of surplus toner. It s people who sell it because they no longer have the printer or something. Often
Re: [Homebrew_PCBs] Re: Discussion on Toner Transfer Method
2010-01-27 by Stefan Trethan
The photo drum in the cartridge will age, requiring a new one after some time. Quote from the link: The only time you need to order an empty cartridge is if
Re: Discussion on Toner Transfer Method
2010-01-27 by bebx2000
Brian, I have had very good experience with http://www.tonerrefillkits.com/ It s thoroughly explained on their site, but basically you buy a first time
Re: [Homebrew_PCBs] Paste screens.
2010-01-27 by DJ Delorie
I ve done kapton, brass sheets, and aluminum foil. The kapton s nice if you need accuracy, but I think it ll be important to ask for vector-cut stencils
Re: setting up the Right Way
2010-01-27 by jcarlosmor
I believe that when someone ask for help about DIY PCB making using professional methods (LPI or dry-film), the last thing he(she) wants to hear is ...give it