Re: [Homebrew_PCBs] HCl/H2O2 etching
2003-05-24 by adam Seychell
... Yes, HCl is the standard when you need a strong acid. Its volatile, so if you spill a bit it will soon evaporate, unlike a sulfuric acid spill which will
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Re: [Homebrew_PCBs] Re: Creating a professional looking solder stopp mask
2003-05-24 by Bill Higdon
Jonathan, I have used that process, even used the same resist at one of my former jobs. It worked ok once you get a handle on applying the resist. Bill Higdon
Re: [Homebrew_PCBs] HCl/H2O2 etching
2003-05-24 by stefan_trethan@gmx.at
... i find it strange that you didn t find hcl earlier. it is very easy to get here.... i remember buying it long time ago when i was even too young to buy
HCl/H2O2 etching
2003-05-24 by Leon Heller
I ve just done a bit of experimenting with the HCl I bought earlier, and some 20 Vol (6%) H2O2 from the local Boot s emporium. A couple of small pieces of PCB
Re: Membrane-switch material/process on PCB's
2003-05-24 by rolanyang
I ve seen very simple ultra-low profile switches on some PCB s. The mechanism seems to be a flexible concave piece of metal which, when pushed down, pops
HCl found!
2003-05-24 by Leon Heller
I ve just managed to get hold of some HCl from a local hardware emporium. It s difficult to find, here in the UK, for some reason, although it is often used
Re: [Homebrew_PCBs] I have a dream...
2003-05-24 by Doug Thayer
Using an LCD instead of a transparency saves you only the very small step of printing the transparency. All the optics and alignment issues remain pretty much
Re: [Homebrew_PCBs] Re: I have a dream...
2003-05-24 by Stefan Trethan
... the hp3d has 300x300 dpi. i don t think this would work. but it would really be nice to simply print to a normal lj. (in a laser printer, how is the laser
Re: [Homebrew_PCBs] Re: Creating a professional looking solder stopp mask
2003-05-24 by Leon Heller
... From: Jonathan W To: Sent: Saturday, May 24, 2003 5:35 AM Subject: [Homebrew_PCBs] Re: Creating a
Re: [Homebrew_PCBs] Membrane-switch material/process on PCB's
2003-05-24 by Ron Amundson
... From: JanRwl@AOL.COM To: Homebrew_PCBs@yahoogroups.com Sent: Friday, May 23, 2003 6:33 PM Subject: Re: [Homebrew_PCBs] Membrane-switch material/process on
Re: Creating a professional looking solder stopp mask
2003-05-24 by Jonathan W
... involved ... solder mask ... fall ... In a small semiconductor research lab in which I work, we regularly apply photoresist to silicon wafers using a
Re: I have a dream...
2003-05-24 by Jonathan W
... Gerber file ... and ... It would appear that several people are thinking along the same lines. The LCD screen idea occurred to me (either with changing the
Photoplotter on eBay
2003-05-24 by twb8899
There is a Mivatec MIVA 25 Photoplotter for sale on eBay. I think this is the model that uses a 1 square high resolution CRT to image the film. The CRT is
Re: [Homebrew_PCBs] Membrane-switch material/process on PCB's
2003-05-23 by JanRwl@AOL.COM
In a message dated 5/23/2003 3:21:22 AM Central Standard Time, ... Neil: The only such stuff I am aware of is conductive rubber which the membrane presses
Re: [Homebrew_PCBs] liquid resist (for larry)
2003-05-23 by Stefan Trethan
all i know about liquod resist is the following: its from a friend in hugary. he makes lots of prototypes, 0,15mm standard with. always sprays on resist
Re: [Homebrew_PCBs] Re: I have a dream...
2003-05-23 by Stefan Trethan
nice dream... but i don t think any plotter attempt will work. it is not the problem of getting some source (a laser with fiberoptics etc) on the plotter but
Re: I have a dream...
2003-05-23 by John Myszkowski
That is a great Hi-Tek idea. BUT, I subscribe to the K.I.S.S. method... keep it simple I used to work in a professional PCB manufacturing lab and they also
Re: [Homebrew_PCBs] I have a dream...
2003-05-23 by kenneth magers
how about just a uv led with a lens to focus to a diameter you want i bet it would fit in the pen holder without modifications you might just have to repeat
Re: [Homebrew_PCBs] Re: Creating a professional looking solder stopp mask
2003-05-23 by Larry Battraw
... Whoops, that would be me. Not sure what I was thinking when I wrote that. What I meant to say was I would plot a negative of the pattern without traces.
RE: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-23 by Marty Grove
Hello Markus. I$B!G(Bll take a look and see what all is needed for this and post something a.s.a.p. I thought id$B!G(B make a quick point to let everyone
Re: [Homebrew_PCBs] I have a dream...
2003-05-23 by Simon Whitehead
At home I have a Photographic Wet Darkroom (as opposed to a Digital Darkroom) and I have often wanted to project UV light to expose some of the older forms
Re: [Homebrew_PCBs] I have a dream...
2003-05-23 by Zoran A. Scepanovic
Hello Neil, 23. May 2003, 10:36:00, you wrote: N Maybe this has been thought of or done already? Or maybe I m going off the N deep end? N Cheers, N -Neil.
RE: [Homebrew_PCBs] Etchant options?
2003-05-23 by John Craddock
Thank you very much Markus. I loof forward to reading about both the through plating and the spray etcher at a time when you are less snowed under . Regards
Re: [Homebrew_PCBs] Etchant options?
2003-05-23 by Markus Zingg
Hi John Problem is that the unit I have is filled with etchant. I would have to disassemble it to give much more precise information. I will do this at a later
Re: [Homebrew_PCBs] I have a dream...
2003-05-23 by Markus Zingg
... There was a thread about this in a german usenet group not so long ago. Anyways, while this might be possible, let me tell you that I do not agree with you
Re: [Homebrew_PCBs] I have a dream...
2003-05-23 by Leon Heller
... Even better would be something like a home-made laser plotter with a UV laser plotting directly onto the resist-coated PCB. Send it the Gerber file and
I have a dream...
2003-05-23 by Neil
Alright, call me crazy, but an idea just occurred to me, and I can t see why it can t work. To me, the most difficult (expensive, complicated, unreliable,
Membrane-switch material/process on PCB's
2003-05-23 by Neil
There is a special type of material that is used on PCB s for membrane-switch contacts. I believe it s carbon, and usually laid out in some interlocking
Re: RE: [Homebrew_PCBs] Etchant options?
2003-05-23 by Stefan Trethan
look in the archives, i have already annoyed him with plenty of questions about this unit. his tubes have a end plate with holes only i think. if you can t get
Re: [Homebrew_PCBs] Re: Creating a professional looking solder stopp mask
2003-05-23 by Stefan Trethan
i would really try to use the photosensitive laquer which is developed with soda ash. i think you can apply this without using the screen. maybe spraying is an
RE: [Homebrew_PCBs] Etchant options?
2003-05-23 by John Craddock
Markus, Can you tell us the size of the holes at the bottom (inlet) and the sides (outlet) of the spray tubes? Thanks Regards John C. ... From: Markus Zingg
Re: [Homebrew_PCBs] Etchant options?
2003-05-23 by Neil
No, I m not sure I want to use Ammonium Persulphate, so I returned it. Back to FeCl. I think I can manage to avoid spilling any ..... famous last words! :-)
Re: [Homebrew_PCBs] Etchant options?
2003-05-23 by Neil
Jan, Your Ammonium Persulphate story reminds me of the movie Alien . :-) When I picked up the AP, I did so for one specific reason ... Fry s was out of my
Re: [Homebrew_PCBs] Etchant options?
2003-05-23 by Adam Seychell
FeCl3 stains can be removed with dilute HCl. If you stain some clothing, just soak in bucket of water with a splash of concentrated HCl, leave overnight.
Re: Creating a professional looking solder stopp mask
2003-05-22 by twb8899
I use a screen printed soldermask that is UV cured. There are many suppliers of this ink and mine is made by Taiyo. We make a silksceen using Autotype Five
Re: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Zoran A. Scepanovic
Hello Markus, 22. May 2003, 22:35:57, you wrote: MZ Hi Marty & Steve MZ Thanks for the pointers. I m willing to take some effort to get a real MZ solder
RE: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Larry Battraw
I ve done a couple different things as far as masking at home. Acrylic floor polish works fairly well as long as you re using it to protect the copper and not
RE: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Brian Schmalz
I think this is also a great question - how to apply solder mask at home. For all you chemical gurus on this list, couldn t you mix up a solution of wet solder
Re: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Markus Zingg
Hi Marty & Steve Thanks for the pointers. I m willing to take some effort to get a real solder stop mask. @Marty - I would be especialy interested how the dry
RE: [Homebrew_PCBs] Re: Etchant options?
2003-05-22 by Marty Grove
Hi Tom. I m very familiar with the 315. I would think that would be a great etcher for home brewing pcb s. Marty ... From: twb8899 [mailto:twb8899@yahoo.com]
RE: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Marty Grove
This is a good question. I hadn t thought of this while considering the possibilities of building boards at home. Although I rarely got involved with the
Re: [Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Stefan Trethan
isn t this done by silkscreen printing? all i know a about this is that you have a screen which is coated with photoresist. this has to be exposed pretty much
Re: [Homebrew_PCBs] Etchant options?
2003-05-22 by JanRwl@AOL.COM
In a message dated 5/22/2003 11:19:54 AM Central Standard Time, ... Neil: Be CERTAIN you either put that ammonium persulfate stuff in a GLASS container, or use
Re: [Homebrew_PCBs] Etchant options?
2003-05-22 by Stefan Trethan
if you want to keep it portable you may try such a cooling container (the insulatet box for keeping things cold without active cooling system). this has a
Re: Etchant options?
2003-05-22 by twb8899
Marty, I built a small spray etcher many years ago using a Little Giant pump and a quartz heater for use with ferric chloride. Now I use this same unit to
[Homebrew_PCBs] Creating a professional looking solder stopp mask
2003-05-22 by Markus Zingg
Hi all I would like to hear from you guys if it s possible to create a professional looking solder stop mask for PCB s. Is there a foil or such that could be
Re: [Homebrew_PCBs] Etchant options?
2003-05-22 by Markus Zingg
... Neil As Marty stated, constucting a spraying etcher is not that difficult. I have one for home use that I bought from a small german company. Anyways, all
Re: [Homebrew_PCBs] Etchant options?
2003-05-22 by Neil
... Yes, exactly. ... I had been using a flat tray, with the board sitting flat on it, and I d heat/stir with a small hairdryer aimed so that the solution
Re: [Homebrew_PCBs] Etchant options?
2003-05-22 by Neil
... I use the positive photo-resist boards from MG. ... Doing all that -- agitation and heating. ... Yep -- I found Ammonium Persulphate at Fry s, which is why
RE: [Homebrew_PCBs] Etchant options?
2003-05-22 by Marty Grove
Hello Neal. I m assuming that you are asking how clean the lines are after etch (as opposed to how clean the etchant is after you have etched some boards). I