Re: DIY SolderMask
2009-06-24 by Steve
... I think sensitizer is the word you are looking for? ... Don t confuse UV -cured- polymer with UV -resistant- outdoor ink. Nothing similar. I m sure it is
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Re: [Homebrew_PCBs] GBC laminator Question
2009-06-24 by DJ Delorie
I m guessing there are two issues here: 1. Sticking to the rollers. 2. wrapping around the rollers. #1 is solved with some paper. #2 doesn t happen with PCBs.
Re: [Homebrew_PCBs] Re: GBC laminator Question
2009-06-24 by Ed Smith
The only time I use a carrier is with photo-resist to keep from contaminating the rollers with resist. Even then, only a thin paper carrier is needed. Also,
Re: GBC laminator Question
2009-06-24 by a3v03v0
A PCB does not require a carrier. I tape the artwork to the PCB with blue painters tape. The other side of the PCB is bare. A common reason for bad transfers
Re: [Homebrew_PCBs] Re: DIY SolderMask
2009-06-24 by Simao Cardoso
... I could not stop thinking about from what is made that soldermask. So i asked the seller gently. (my question) hi, i was looking for soldermask and...
GBC laminator Question
2009-06-24 by sailingto
Hello all, the $25 GBC Personal Laminator it says to use a carrier with the laminator - is this really needed? I ve just used a piece of paper folded around
Re: Dragon's Blood resin reduces undercut?
2009-06-24 by Steve
... I tried to leave this comment on your blog, it said it was too spammy : Nice! What method are you using to make the PCBs? Are there any issues from the
Using a JRoller to apply photoresist
2009-06-24 by javaguy11111
I tried using a J-roller to apply photoresist yesterday and it worked quite well. No problems with air bubbles getting trapped under the resist. You want to
Re: [Homebrew_PCBs] Re: “Dragon’s Blood ” resin reduces undercut?
2009-06-24 by Daniel Johnson
DIY is great but at some point the use of affordable products makes sense. Pulsar paper and foil are two examples of this. At $15 for 10 sheets the material
Re: [Homebrew_PCBs] Stargate daughter PCB
2009-06-24 by DJ Delorie
Note that gEDA s PCB has a way of loading a photograph as the background of your work area for just this purpose, but it doesn t let you go straight from photo
Stargate daughter PCB
2009-06-24 by Surf Thenet
Hey guys, Anyone play Stargate at the arcades growing up? The original Stargate arcade boards came with a daughter PCB, a scab used by Williams Electronics to
Re: Using Silk Screen Emulsion for PCB making
2009-06-24 by aurangzebhaque
Simao, ... I have no problem with benzenophenone, except it may not be available and/or its cost. The English translator works for me. Sorry everybody. I
Re: [Homebrew_PCBs] Re: “Dragon’s Blood” resin reduces undercut?
2009-06-24 by Russell Shaw
... You could add starch to your own paper. http://www.google.com.au/search?hl=en&q= spray+starch &btnG=Google+Search&meta=&aq=f&oq=
Re: Dragon's Blood resin reduces undercut?
2009-06-24 by a3v03v0
I would guess that you are aware of these, but in case you are not. Pulsar s paper is coated with starch and will not pull properly attached toner from a PCB.
Re: Dragon's Blood resin reduces undercut?
2009-06-23 by Daniel Howard Bryant
In the summer of 2003 I witnessed a very similar technology at a joint ISA-ESA-IEEE conference in Arkansas. The presentation was about how to carry liquids(a
Re: [Homebrew_PCBs] Re: Using Silk Screen Emulsion for PCB making
2009-06-23 by Stefan Trethan
Yes, strictly speaking that is correct. However in the PCB industry silkscreen usually only means the component legend print no matter if this is even done
Re: Using Silk Screen Emulsion for PCB making
2009-06-23 by pgdion1
Hi guys, that s not a silk screen, it s a mask. A silkscreen is a mesh cloth (silk) that is stretched across a frame. It s coated with a rubbery plastic goo.
Re: Dragon's Blood resin reduces undercut?
2009-06-23 by javaguy11111
... I have some hopes of doing some homebrew MEMs experimentation. I am just getting back into board building and starting to do some work with photoresist.
Re: [Homebrew_PCBs] Re: Using Silk Screen Emulsion for PCB making
2009-06-23 by Simao Cardoso
... Me, i just use toner transfer, because is simpler, i wish to use direct print for layout and soldermask if possible, but i still didn t even finish the cnc
Re: Dragon's Blood resin reduces undercut?
2009-06-23 by jc805sb
... I am etching copper patterns which operate as the MEMS (the field calls it MEMS although there s nothing mechanical). I have pictures on my blog here,
Re: Dragon's Blood resin reduces undercut?
2009-06-23 by javaguy11111
Are you trying to mount MEMs devices on a pcb or using a pcb for making MEMs devices?
Re: Using Silk Screen Emulsion for PCB making
2009-06-23 by aurangzebhaque
Simao, Thanks for the excellent link. I am going to try it this weekend. One comment. I have been making many many silkscreens using translucent tracing paper,
Re: [Homebrew_PCBs] Dragon's Blood resin reduces undercut?
2009-06-23 by David Griffith
... I m familiar with Dragon s Blood, but not in this context. The only uses I ve been aware of are incense and perfumery. It seems rather expensive for this
Dragon's Blood resin reduces undercut?
2009-06-23 by jc805sb
I am etching general pcb s and also etching pcb s for MEMS devices. The MEMS uses copper pads as small as possible so I am attempting to get down to 0.125mm
Re: [Homebrew_PCBs] Using Silk Screen Emulsion for PCB making
2009-06-22 by Myc Holmes
Using silk screen emulsion, it is worth a try, The only thing I would be concerned with is the emulsion s adhesion to the copper. Silk screens are made from
Re: [Homebrew_PCBs] Re: No Clean Flux
2009-06-22 by DJ Delorie
I ve found another factor in the choice, too... It s harder to clean no-clean solder paste off stencils :-P
Re: [Homebrew_PCBs] Using Silk Screen Emulsion for PCB making
2009-06-22 by Simao Cardoso
... I also think about it, not to use the emulsion but to buy the sensiblizer which is said to be benzenophenone, the same thing used in dry films and i
Re: [Homebrew_PCBs] Re: No Clean Flux
2009-06-22 by Russell Shaw
... What s wrong with rosin flux and not cleaning it? I ve been doing that for 10 years. Old valve gear works for eons. My stuff is hand-soldered leaded
Re: [Homebrew_PCBs] Using Silk Screen Emulsion for PCB making
2009-06-22 by Kerry Wentworth
That occurred to me, also. I have some emulsion sitting around, although it may be out of date. Other things to test: 3. Will it resist etch? 4. Can you
Re: [Homebrew_PCBs] Using Silk Screen Emulsion for PCB making
2009-06-22 by leon Heller
... From: aurangzebhaque To: Sent: Monday, June 22, 2009 11:34 AM Subject: [Homebrew_PCBs] Using
RE: [Homebrew_PCBs] Using Silk Screen Emulsion for PCB making
2009-06-22 by Brian Thorp
The emulsion is between the theads... the screen is what holds it ... Date: Monday, June 22, 2009 8:20 am To: Homebrew_PCBs@yahoogroups.com Subject:
Re: No Clean Flux
2009-06-22 by rbert99@sbcglobal.net
Hi Brian, This is in regards to your post on No Clean Flux. Noclean is hard to clean and may be conductive. I had problems in rf circuits even with my mega8
Using Silk Screen Emulsion for PCB making
2009-06-22 by aurangzebhaque
Hi everyone, I wonder if it is possible to use the photo sensitive Emulsion used in the silk screen making process directly on the blank PCB copper surface. I
Re: UV LED Exposure unit
2009-06-17 by javaguy11111
I received the current limiters in today and they work as advertised. For 7 LEDs in a string and 11 strings per board, the board pulled a total 220ma. The
Gerber file converter
2009-06-16 by Adam Seychell
Hi, I recently updated gerb2tiff command line tool for converting Gerber files to TIFF raster image. If anyone is interested, the new version is available for
Re: [Homebrew_PCBs] Re: DIY SolderMask
2009-06-16 by Myc Holmes
It seems the the UV coatings are becoming more popular. This is probably due the to government air quality requirements regarding volatile organic compounds
Re: [Homebrew_PCBs] Re: DIY SolderMask
2009-06-16 by Daniel Johnson
I am sure he is buying it bulk and packaging it. I do not have time to search just now but here is a place to start.
Re: [Homebrew_PCBs] Re: DIY SolderMask
2009-06-16 by Myc Holmes
It seems a bit expensive for some UV curable paint $15 for 1/3 of an ounce, but I guess that is what ebay is all about. * How did he keep the traces covered?
Re: DIY SolderMask
2009-06-16 by sailingto
That looks slick - his finished PCB has nice exposed solder pads, but the traces are still covered with green - how did he keep the traces covered with only
Re: [Homebrew_PCBs] Re: ExpressPCB software mirror image?
2009-06-16 by Daniel Johnson
Richard, The MAXNC mill could route the board. Toner transfer is faster because I was making about 12 PCB of each type for a class i was teaching. Let me
DIY SolderMask
2009-06-16 by Daniel Howard Bryant
I found this on ebay today: ebay item #: 360156811112 it may be of interest to the group! I ve been looking around at solder mask, not that I would need it,
Re: ExpressPCB software mirror image?
2009-06-16 by RICHARD HEILIGER
Daniel, Thanks for the info on CNC drilling. I do have PCB-Gcode, and am in that group. Have never tried it. I used the output from DipTrace. DipTrace can
Re: [Homebrew_PCBs] Re:undercutting
2009-06-16 by DJ Delorie
... Not really.
Re: [Homebrew_PCBs] Re:undercutting
2009-06-16 by Simao Cardoso
... You complained earlier about this, the dry film from mg chemicals behave different than the riston? But my big question is, how homebrews that do dry film
Re: [Homebrew_PCBs] Re: UV LED Exposure unit
2009-06-15 by DJ Delorie
... I got mine off eBay from BestHongKong but they don t have any in stock at the moment. Look for 390-395 nm (smaller is better) and the smaller the
Re: [Homebrew_PCBs] Re: UV LED Exposure unit
2009-06-15 by DJ Delorie
... Yup, it works great. http://www.delorie.com/pcb/uvled/ Uses LM317 s and 62 ohm resistors to make 20 mA constant current sources. Each LM317 drives a
Re: [Homebrew_PCBs] Re:undercutting
2009-06-15 by DJ Delorie
... I ve already stripped the mask, but with back-lighting through the microscope it was pretty easy to see what was happening. I m thinking of re-etching
Re: [Homebrew_PCBs] Re: UV LED Exposure unit
2009-06-15 by Harvey White
... You can do that. You can also use an LM317 as a constant current source. Using one (at 20 ma) is somewhat of a waste, so the LM317 as a voltage regulator
Re: [Homebrew_PCBs] Re: UV LED Exposure unit
2009-06-15 by Ed Smith
Hi Dan, What is your source for the LED S, price, output frequency, etc. I am very interested in this type exposure unit. Thanks, Ed Smith ... From: Daniel
Re: [Homebrew_PCBs] Re: UV LED Exposure unit
2009-06-15 by John Coppens
On Mon, 15 Jun 2009 00:33:33 -0000 ... Look back on the list, and look to DJ Delorie s site. He constructed a UV Led illuminator, and seemed happy with it.