Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-06 by Paul Whatton
+1. I am so glad I don t do toner transfer any more! Paul G4DCV ... [Non-text portions of this message have been removed]
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Re: Toner Transfer Failures
2012-03-06 by chris
... First try: Printed a sample from some packages example, magazine paper, HP P1102W Laser printer. Not too bad, did not fuse well to board though. I started
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-06 by Benjamin Blumer
Another tip: concerning the tedious process of drilling, it won t be as rugged as properly drilling the holes, but you can always try to surface mount your
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-05 by Harvey White
... Either board not clean enough or not enough heat, unless there s a problem with the magazine paper. ... I d have used the scotch brite first (I use
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-05 by Benjamin Blumer
When you say polished it makes me think of a shiny, perfectly smooth surface. I tend to rough my boards up a bit using high grit sandpaper. My logic is
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-05 by michael tenore
Hi! Using a iron to do toner transfer successfully takes some experimentation! You did not indicate the size of the board you are trying to make,But it is
Re: Toner Transfer Failures
2012-03-05 by tda7000
... The repeated failure to transfer your toner seems rather strange. Certainly it sounds like you have got the board clean enough. I found that for me, making
Re: Toner Transfer Failures
2012-03-05 by tda7000
... I also use 0.8mm for most things like capacitors, resistors etc. You need 1.0mm for some diodes, TO-220 regulators and such. Some even more. If you re ever
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-05 by Spencer W
I bought this laminator, http://mobile.buy.com/ibuy/Product.aspx?sku=211236158 . $43 for the gbc h212 and get perfect toner transfers. Run it through 6-8 times
Re: [Homebrew_PCBs] Toner Transfer Failures
2012-03-05 by Leon Heller
On 05/03/2012 20:24, John wrote: Project under planning... The chip fit fine but I ... I use 0.7 mm or 0.8 mm for most parts, including ICs. I often use 0.6 mm
Toner Transfer Failures
2012-03-05 by John
This has become a humpling experience! You folks have made this sound too easy, or maybe senility has set in on my part. First try: Printed a sample from some
Re: Etching problem - Help please
2012-03-05 by Pete
Thanks for the advice folks, a great response to my question and all much appreciated. I ll do some more trials and report back soon. Thanks Pete
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Leon Heller
... I use Mega Electronics boards, and they seem to go off after about six months or so. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Paul Whatton
Hi Pete Are you are buying your pre-sensitised board from Maplin? Particularly from a store rather than mail-order? The only major problem I have had has been
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Donald H Locker
Apologies to the O.P. I missed the exposed resist and was thinking toner transfer. Donald. -- *Plain Text* email -- it s an accessibility issue () no
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Eddie Stassen
I presume this is positive photoresist, in which case it looks like either over exposure or transparencies that are not dense enough. Try adjust you exposure
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Leon Heller
... Try continuous agitation (I rock the container) in heated etchant. I put the small plastic container I use for etching in an outer container of very hot
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Malcolm Parker-Lisberg
Pete I would suggest that you are not removing all the resist when you develop your board, they need longer and a good spray rinse. I get similar islands due
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Terry Jones
Try etching it face up...instead of face down. Etches much cleaner. brush it lightly with a nylon (white brisel ) paint brush after about 15 minutes and you
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Benjamin Blumer
As mentioned by Donald, heating your etchant helps a lot. I ve lost the link, but there was a white paper published by some company that suggested that heating
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Andrew Leech
I ve also seen this exact problem from under exposure. If possible agitate / rotate board (or leds) during exposure, to ensure even coverage. You may need to
Re: [Homebrew_PCBs] Etching problem - Help please
2012-03-05 by Donald H Locker
I d say a process problem. Agitate more often and more vigourously. The stripes are from the glass beneath the copper - the copper I believe is slightly
Etching problem - Help please
2012-03-04 by Pete
Hi, I am trying to etch a small PCB and finding it etches unevenly leaving a small area of copper which is stubborn to remove. Just leaving in the etchant for
Re: [Homebrew_PCBs] Re: Soldering
2012-03-01 by M A
Hi Could you tell me how to calcuate the ESD in clean room area? Thanks & Regards Mohamed Ali From: blue_eagle To:
Re: [Homebrew_PCBs] Re: CNC choices for PCB creation
2012-03-01 by joe M
Hello Brian, That is some pretty cool stuff you have there. Do you hang around in the #linuxcnc of freenode? Would be cool to get your advice, once I start
Re: CNC choices for PCB creation
2012-02-29 by Brian
Although not exactly what you are asking for, I did build my own CNC system and I do use it successfully for isolation routing of PCBs. True it is not as
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-29 by DJ Delorie
... Nah. I drill two diagonally-opposite pins in both boards, and thread wires through them. They come together pretty accurately that way.
Re: PTH Process
2012-02-28 by ohmware
That link points to a process that s only intended for hole wall activation. You still have to electroplate afterwards to have permanent connections between
Re: PTH Process
2012-02-28 by studleylee
goto http://www.thinktink.com/stack/volumes/volvi/condink.htm
Re: CNC choices for PCB creation
2012-02-28 by Kaelin Colclasure
I have been doing some exploration of this topic on my own, using the Desktop and Buddy ShopBot machines available at the TechShop. Basically my conclusion was
Re: [Homebrew_PCBs] CNC choices for PCB creation
2012-02-28 by joe M
Jay, Get on #linuxcnc or #diycnc of freenode. The folks there are awesome and can get you going. some sample info that I have: ...
Re: [Homebrew_PCBs] CNC choices for PCB creation
2012-02-28 by cary heestand
Have you found the CNCZone.com site? There is an overwhelming amount of information and ideas there. A lot of PCB CNC information too. cary ... From: Jay
Re: [Homebrew_PCBs] CNC choices for PCB creation
2012-02-28 by Harvey White
... PC boards need a high speed spindle for routine and drilling. Low mass, and the tools have a limited life. One estimate is 75 linear feet of machining
Re: CNC choices for PCB creation
2012-02-28 by Robert
you want the pcb-gcode (Eagle) yahoo group for that. This is probably the better place though for all around, drilling could be by cad/cam (Bob-cam or?) but
Re: PTH Process
2012-02-27 by ohmware
I just read something that intrigued me in the book How to Diagnose and Fix Everything Electronic by Michael Jay Geier. He talks about some newer PCBs in
CNC choices for PCB creation
2012-02-27 by Jay
Howdy, homebrew folks. I ve done a bunch of googling, searched the homebrew PCB archives, and the like, and the information I ve been able to find on this
Re: [Homebrew_PCBs] Old Dynaart equipment and Sodium Persulfate
2012-02-26 by Harvey White
... A lot, from what I can see. Minimal: one heater rather than two. Significant: Entire box is made of transparent acrylic. From what I can see, the
Re: [Homebrew_PCBs] Old Dynaart equipment and Sodium Persulfate
2012-02-26 by H. Carl Ott
... I had an older model of the tank. Don t know if there are any design changes on your model. I think I used ammonium persulfate (may have been sodium) in
Free eBook VHDL Coding and Logic Synthesis with Synopsys
2012-02-26 by Robert
http://ebookee.org/VHDL-Coding-and-Logic-Synthesis-with-Synopsys_270975.html I was looking for the Synopsis EDA downloads and found this, thought some folks
Re: Novel way to expose photo resist??
2012-02-26 by Robert
cool! Robert
Re: PTH Process
2012-02-25 by Terry
A simpler/cheaper alternative to electroless prepping of the holes, that seems to work quite well, is to use graphite laden india ink. Add about 10 grams of
Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-25 by Malcolm Parker-Lisberg
Make your own pulsed nitrogen UV laser with tow bits of bent aluminium and fresh air For technical coverage of the UV Nitrogen laser, see:
Re: [Homebrew_PCBs] PTH Process
2012-02-25 by Donald H Locker
Took me a while to find it, so I m posting a link to the directory it s in.
RE: Another approach for lasers
2012-02-25 by Leslie Schwartz
Links some people may feel are worth viewing for ideas or inspiration re: various approaches, I found them interesting, it seems all of the parts to make this
PTH Process
2012-02-25 by Dave M
I recently ran across a booklet that I had bought (online) a number of years ago that describes, in pretty good detail, a process for making PCBs with plated
Re: [Homebrew_PCBs] Another approach for lasers
2012-02-25 by kabowers@NorthState.net
... Another idea from the twilight zone: Could you apply reprap/3-d printer ideas to applying toner? Make an injector with a really fine orifice (ss hypodermic
Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-25 by Donald H Locker
costs $60/quart, cures with 385nm UV. Could work. Donald. -- *Plain Text* email -- it s an accessibility issue ()
Re: [Homebrew_PCBs] Another approach for lasers
2012-02-25 by Donald H Locker
Copper is an amazing conductor of heat. Bringing the copper-touching toner to a fusible temperature without the laser-facing top layer vapourising would be
Re: Novel way to expose photo resist??
2012-02-25 by boombox666
A optical pickup unit from a blueray player or HD-DVD has a 405nm laser diode with the wavelength optimized optics inside like a collimator, focus actuator and
Re: Novel way to expose photo resist??
2012-02-25 by boombox666
Hello Sage, I have done some tryntific tests by exposing a photopositive PCB with the common 405nm laser diodes from HD-DVD and Blueray players. Here are the