Re: Oxygen regeneration of CuCl2
2011-05-10 by H1000100
I made 2 liters of the stuff in a coke bottle. I didn t have a hygrometer, but I weighed it on a kitchen scale and kept adding more copper till it was heavy
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Re: Controlled solder paste dispensing
2011-05-10 by Terry
For prototyping you can make your own solder stencils using a 3-4 mil copper gasket material from a good hardware store. I use toner transfer to apply the
Re: [Homebrew_PCBs] Controlled solder paste dispensing
2011-05-09 by Erik Knise
I solder the majority of my boards by hand. Giving the joint a good fluxing and then zip soldering does the trick. I have used one of those air powered
Re: Controlled solder paste dispensing
2011-05-09 by hotsnausage
Chipquik sells a tack flux as part of their rework product line -- you might want to try using it as the additive to decrease the viscosity of your paste.
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-09 by Andrew Leech
... The bright clear green should be ready-to-etch state. Opaque means it s spent state. Here s a great resource on the chemistry behind it with really good
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-09 by Jim
Thanks DJ Last week I had a 55 oz jar of transparent emerald green etch. Using this etch was SLLLOW. I added scrap copper and started bubbling. It took about
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-09 by DJ Delorie
The only way to know how strong your CuCl etchant is, is to use a hydrometer. The copper makes the solution more dense, by measuring the density you can
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-08 by Jim
My jar of CuCl ?? was transparent emerald green(~55 Oz.). I put some more copper scraps in it and turned on the bubblier. It ran for 2 days. The contents of
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Leon Heller
... I found the optimum exposure for my process by sliding a piece of cardboard across a test piece of laminate with a test piece of artwork, moving it at 1
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Leon Heller
... I print my positives on Mega Electronics JetStar Premium film using a cheap HP inkjet printer. They work very well. Leon -- Leon Heller G1HSM
RE: [Homebrew_PCBs] Re: Length of sunlight exposure of photosensitive boards
2011-05-08 by Boman33
For initial exposure testing remove the variable of the negative by instead placing guaranteed opaque objects on the photosensitive layer. For example place a
Re: [Homebrew_PCBs] Re: Hydrogen Peroxide Source
2011-05-08 by mlerman@ix.netcom.com
No, it s not 30%, it s 30 Volume, which I think is 9%. They also have 40 vol, which is 12%. You can buy higher concentrations, see ebay or google.
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by DJ Delorie
... Sunlight is very variable, but in general, anyone doing UV exposure should have a transmission step wedge - this is a plastic film with various
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-08 by DJ Delorie
... Until you ve converted it, you still have an HCl/H2O2 etchant. The H2O2 breaks down over time, and the HCl evaporates, leaving you with just water. So,
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Tom Biery
One very important aspect is how you make the negative? I am using Vellum drafting film trade name is Clearprint or Dietzen brand. I am curious what
Re: Length of sunlight exposure of photosensitive boards
2011-05-08 by alex4459jopiklal44
... I have got a face tanner,,guess its the name..hmm Philips make them with 4 small tubes.. get them in a flee market..I payed same amount as 3 pound for such
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Leon Heller
... It depends where you are, to some extent. I think it takes a lot longer than that. Make yourself a UV exposure unit like this one of mine:
RE: [Homebrew_PCBs] Controlled solder paste dispensing
2011-05-08 by Boman33
Hi Tom, I already did that but adding 50 % liquid flux to the solder paste I get a very liquid runny mixture that does not stay on the pads. I am hoping to
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Tom Biery
I ve done it not with Injectorall but with Kinsten, I was able to expose for 2-2.5 minutes of very bright sun. Works ok but yield is not good. If you can
Re: [Homebrew_PCBs] Re: Hydrogen Peroxide Source
2011-05-08 by Peter Loron
IIRC they have 30% at beauty supply places. -Pete ... [Non-text portions of this message have been removed]
Re: Hydrogen Peroxide Source
2011-05-08 by Mike
I checked at a Leslies Pool Supply in Phoenix, AZ, where you would expect a full range of pool and spa products to be frequently used. They did not know what I
Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive boards
2011-05-08 by Bill Maxwell
Probably depends on your latitude to some extent, James but 6 minutes might be too short an exposure. I have used the method a couple of times but it is very
Re: Length of sunlight exposure of photosensitive boards
2011-05-08 by tda7000
No idea but I doubt it will work well even if it does work. A UV light box is cheaply made or bought, and will give much faster and consistent results. Waiting
Length of sunlight exposure of photosensitive boards
2011-05-07 by James English
Hello, I m new to this group, though not new to electronics. Does anyone out there have experience with exposing a photosensitive board through a negative to
Re: [Homebrew_PCBs] Controlled solder paste dispensing
2011-05-07 by Tom Biery
Why don t you mix a 50%/50% bactch and try it with a smaller needle, Tom For those interested in a youtube videos of my Homebrewed Printed Circuit Board
RE: [Homebrew_PCBs] Controlled solder paste dispensing
2011-05-07 by Boman33
Thanks Peter for a very fast reply. Actually I have an equivalent USA made unit that I paid about three times more for. This is a very good price and I will
Re: [Homebrew_PCBs] Controlled solder paste dispensing
2011-05-07 by Peter Loron
Something like this may be what you need:
Controlled solder paste dispensing
2011-05-07 by Boman33
For regular SMT assembly I use commercial stencils to screen print the solder paste but I am having problems dispensing solder paste by hand in small amounts
Re: Cutting PCBs
2011-05-06 by Andrew
And I should add, that machine is so *small* compared to many of my machine tools, that it was a bit of a shock to reconsider how huge it would appear from the
Re: Cutting PCBs
2011-05-06 by Andrew
Well, a good point. My electronics hobby supports my machining hobby (I got into TT when redesigning a PWM motor drive for a small lathe), While my home
Re: Hydrogen Peroxide Source
2011-05-06 by bebx2000
Try sodium perborate tetrahydrate as a high value hydrogen peroxide source, http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/25159 and Using it,
Re: [Homebrew_PCBs] Re: Hydrogen Peroxide Source
2011-05-06 by Mark Lerman
Interestingly, it was a Leslie s pool that I went to yesterday! I ll call them this morning. Thanks! Mark
Re: Hydrogen Peroxide Source
2011-05-06 by Norm
Curious about strength, I went looking - found this: *This VOLUME......* *contains this PERCENTAGE of hydrogen peroxide* 10 volume or V10 3% 20 volume or
Re: Hydrogen Peroxide Source
2011-05-06 by Norm
I have to stop relying on memory - approaching 80, I have CRS syndrome (can t remember s**t). Looked at the bottle, and it s *40 volume*, not 30%.**Called
Re: Hydrogen Peroxide Source
2011-05-06 by designer_craig
Is that 30 Volume or 30 percent? When I looked it was 30 and 40 Volume. I think 30 Volume is around 10 or 12%. Craig
Re: Oxygen regeneration of CuCl2
2011-05-06 by tda7000
Thanks.. I guess that explains it! I ve only done a few boards and the etchant is certainly not dark. So, I just have to keep adding a little hydrogen peroxide
Re: Hydrogen Peroxide Source
2011-05-06 by Norm
Got mine from a professional beauty supply store (for hair coloring) - 30% or so, $5.00 per quart. Norm
Re: Hydrogen Peroxide Source
2011-05-06 by H1000100
In Canada, none of the pool and spa shops carried it. I ended up getting 35% food grade peroxide at a health food store. 5 years ago, it was $17.00 for 1
Re: [Homebrew_PCBs] Re: Hydrogen Peroxide Source
2011-05-05 by Jim
Mark Here is a link to a pool supply here (So. Ca.) The name is Baquacil shock and oxidizer. I use it in my etch rejuvenation, in my hydroponic garden and I
Re: Hydrogen Peroxide Source
2011-05-05 by Jim
Baqua spa oxidizer. However, I made a mistake on the concentration -it s only 7.5% . Getting old, memory not what it used to be.
Re: [Homebrew_PCBs] Re: Hydrogen Peroxide Source
2011-05-05 by Mark Lerman
I stopped at the local pool supply and asked for peroxide. They didn t know what I was talking about, and I didn t see any there. Is there a brand name? What
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-05 by Erik Knise
While they look similar I can almost guarantee the grizzly model is made to closer tolerances. It s also cheaper so I d recommend the Grizzly. You might want
Re: Cutting PCBs
2011-05-05 by tda7000
Hacksaw makes short work of cutting PCBs but it s hard (for me anyway) to get straight edges (which is why I don t like to use it) Of course you can fix that
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-05 by Tom Biery
Considering... Harbor Freight http://www.harborfreight.com/8-inch-bench-top-shear-brake-90757.html Grizzly
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-05 by Alessio Sangalli
... oh ok :) still, I am for public domain ;) bye as
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-05 by Alessio Sangalli
... Well I think the problem is that mahcine is so huge, one can hardly justify the real estate it takes if it s used only for PCBs. bye as
Re: Hydrogen Peroxide Source
2011-05-05 by Jim
Hot tub/spa supply stores should also have it around 30%. It s used as an oxidizer to clean organic waste from the water.
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-05 by DJ Delorie
If you can see the pcb AT ALL in the solution, you don t have enough etchant in it yet. Mine is so dark, it s basically black, and I can only see the pcb if
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-05 by DJ Delorie
... You already have that image cached. Try shift-reload: http://www.delorie.com/tmp/stolen-image.html
Re: Hydrogen Peroxide Source
2011-05-05 by designer_craig
Hell, with dozens of medical marijuana pharmacies in each city here in California and the fact the state is bankrupt there is not much chance they can monitor