RE: [Homebrew_PCBs] Substitute for Sodium Persulphate
2016-05-28 by keith printy
What about ammonium persulfate ? when I worked at the electronics plant that was what we used to etch our boards. It is clear and turns blue as it etches . we
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Re: Substitute for Sodium Persulphate
2016-05-28 by wb8nbs@...
Normally you use a bubbler to agitate a small tank, and the pumps are not in the solution. Bubbling also regenerates the cupric chloride which is what is
Re: [Homebrew_PCBs] Re: Amount of etchant needed
2016-05-28 by Bill Maxwell
and oddly enough, muriatic acid (and peroxide)*is *an etchant. On 28/05/2016 12:26 PM, Harvey White madyn@dragonworks.info ... and oddly enough, muriatic acid
RE: [Homebrew_PCBs] Re: Amount of etchant needed
2016-05-28 by Dave Wade
Why do they insist on giving it multiple names, its Hydrochloric Acid , in Spain it’s called Agua Fuerte and its noxious stuff. I think I slightly prefer
Re: [Homebrew_PCBs] Re: Amount of etchant needed
2016-05-28 by Harvey White
... Yes, and it s generally mixed one part HCL with 4 parts of drugstore peroxide. Pour the acid into the peroxide. Works wonders, watch because it can be
RE: [Homebrew_PCBs] Re: Amount of etchant needed
2016-05-28 by Brad
Yeah I remember muriatic acid – used to use it to clean our pool. That was seriously nasty stuff – I’m a bit uneasy about bringing it back into my life.
Substitute for Sodium Persulphate
2016-05-28 by Harvey White
I have a commercial etching tank, composed of formed acrylic plastic and two fish tank pumps. It s designed for sodium persulphate etchant. I can get a pool
Re: Amount of etchant needed
2016-05-27 by me@...
There is no need to order echant. Go to the hardware store and buy a bottle of muriatic acid, peroxide at the grocery. 2 parts hydrogen peroxide and 1 part
Amount of etchant needed
2016-05-27 by Brad
Hi guys, So, I think I may have found some much cheaper single side G10 boards in the color I want. I ordered a bunch from here based on photos and the
Recent virus incursions
2016-05-09 by Steve Greenfield
I ve been seeing a lot of obvious instances of email hijacking by spammers. Please make sure you have a virus checker installed and up to date. Do NOT reply on
File - monthly.txt
2016-05-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
Re: [Homebrew_PCBs] Re: images for photoresist
2016-04-13 by Harvey White
... There were two ways of doing this. One was to use black donuts and black crepe paper tape. This would work well with one sided boards. The other method
Re: images for photoresist
2016-04-13 by cs6061@...
Way back in my hand taping days before CAD layout tools, we would lay a board out using Mylar film, ruby tape and Bishop dip and doughnut pads. This was done
RE: [Homebrew_PCBs] images for photoresist
2016-04-13 by Andrew Volk
No view camera for my work, just direct contact printing. When I left college and went into the electronics business, then there were rubyliths (red
Re: [Homebrew_PCBs] images for photoresist
2016-04-13 by Harvey White
... Kodak Kodalith, 2 part developer, stop and fixer. Red light is fine. gave almost a complete black and complete transparent, wonderful stuff. However,
Re: [Homebrew_PCBs] images for photoresist
2016-04-13 by Harvey White
... It was kodalith. It may no longer be available. You had a two part developer that was used to give you that almost step contrast. If you developed it in
RE: [Homebrew_PCBs] images for photoresist
2016-04-13 by Andrew Volk
I did a bit of this in my college days. We used orthographic film (Kodalith, I think) that was not sensitive to reds and had very high contrast. It was
RE: [Homebrew_PCBs] images for photoresist
2016-04-12 by keith printy
That is simple to develop.i haven t done it in a while but it was d76 developer , stop bath and fixer . you have to work in total dark until the fixer. If the
Re: [Homebrew_PCBs] images for photoresist
2016-04-12 by Harvey White
... You want a professional place, one that does drawings, engineering prints, and the like. They re likely to have the ability to make the image.
images for photoresist
2016-04-12 by Jeff Heiss
I m using laser transparencies for photoresist boards and I would like to test a real photographic film image. I understand real film has solid black this is
RE: [Homebrew_PCBs] $25 Direct Laser Printing [1 Attachment]
2016-04-03 by Boman33
Opening the picture and zooming in on the 3 mil one, the line width and spacing are not consistent. I do not think that is caused by the Windows viewer. The
Re: [Homebrew_PCBs] $25 Direct Laser Printing
2016-04-02 by Mark Lerman
It is not the same as the p2502, but it probably would work, though the conversion might differ in detail. Sent from my iPhone
RE: [Homebrew_PCBs] $25 Direct Laser Printing
2016-04-02 by Jeff Heiss
Mark, This is test image .tif to test 3 mil through 12 mil line/spacing. Can you take a picture of it when you print it? Jeff From:
Re: [Homebrew_PCBs] Re: $25 Direct Laser Printing
2016-04-02 by Mark Lerman
Many different ways of doing things. I have never done a toner transfer, but I m guessing I can do finer traces with my printers. But it really doesn t matter
RE: [Homebrew_PCBs] $25 Direct Laser Printing
2016-04-02 by Mark Lerman
Hi Jeff, I got them at Newegg, but it might have been a promotional price because I haven t seen them at that price since. Especially with free shipping. They
Re: $25 Direct Laser Printing
2016-04-02 by AncelB
This is quite an achievement. Good job. Don t think I ll go that way though as I have honed single pass, double sided, registered toner transfers to a
Re: [Homebrew_PCBs] $25 Direct Laser Printing
2016-04-02 by gary burford
Hi all I live in the UK , looking for the Pantum 2502w , not known in the UK but search gives Pantum 2050 , is this the same model & would it work for pcb
RE: [Homebrew_PCBs] $25 Direct Laser Printing
2016-04-02 by Jeff Heiss
Mark, the Pantum P2502W is on Amazon for $36.99 as of April 1, 2016. Where did you get yours for $25? Still a great deal! Have you tried the sample artwork I
Re: Got some single side boards
2016-04-01 by alienrelics@...
Zoomed in, that looks pretty horrible. Lots of light and dark noise in the scan, wobbly edges because of it. I d export it into a format that you can import
File - monthly.txt
2016-04-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
Re: [Homebrew_PCBs] Got some single side boards
2016-04-01 by Harvey White
... As was said, most PC boards are designed today looking from the top through the board. With the photoetch process, you just turned the board over to make
Re: [Homebrew_PCBs] Got some single side boards
2016-04-01 by Harvey White
... For the boards I make, the bottom is not mirrored, the top is. (given EAGLE). I also rotate the boards long way matching the long side of the paper. By
Re: [Homebrew_PCBs] Got some single side boards
2016-04-01 by Stefan Trethan
Typically PCBs are designed today looking through the top side. So you would print the bottom side out without mirroring for toner transfer. Even for
RE: [Homebrew_PCBs] Got some single side boards
2016-04-01 by Brad
Sorry, what I meant by print the image in reverse is I assume I need to mirror it . Unless I m misunderstanding the process, if I printed it as is on my
RE: [Homebrew_PCBs] Got some single side boards
2016-04-01 by Brad
I tried using my Minolta to darken and actually, I think it looks pretty good. Got all the traces nice and black and didn’t lose any of the drill holes. So
RE: [Homebrew_PCBs] $25 Direct Laser Printing
2016-03-31 by Jeff Heiss
Very nice! Can you test how it does with thin traces? Can you print this test artwork .tif? From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] Got some single side boards
2016-03-31 by Harvey Altstadter
You might be able to darken the blacks by scanning as a B & W (not gray scale) with the contrast turned up, and maybe the brightness turned down. A bit of
Re: [Homebrew_PCBs] Got some single side boards
2016-03-31 by Harvey White
... I wouldn t be happy with it, no. ... Change the color palette to monochrome, and then use a very fine brush to cover the holes, that s one way. ... No, the
Re: Got some single side boards
2016-03-31 by unclefalter@...
Oh.. I just discovered I can use my Minolta Di200 s (big combo photocopier/printer/scanner) darken feature to photocopy the artwork darker almost perfectly.
Got some single side boards
2016-03-31 by unclefalter@...
Picked up a bunch of these on ebay. Thought before I spend $400 I might as well see what I get with these and do some trial runs.
Re: [Homebrew_PCBs] $25 Direct Laser Printing
2016-03-31 by John
From a quick search the Pantum P2502W doesn’t seem to be sold in the UK. Does anyone know whether it is available under a different brand name? Thanks, John
[Homebrew_PCBs] $25 Direct Laser Printing
2016-03-31 by Mark Lerman
Hi All, Many of you have commented on my series on Instructables detailing my efforts to use a laser printer to directly print toner on copperclad boards. Once
RE: [Homebrew_PCBs] Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-23 by keith printy
Most of the boards we did at work were small we used only a couple tablespoons of the ammonium persulfate in maybe 16 oz of water ,of course if you put in a
RE: [Homebrew_PCBs] Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by K5ESS
Ammonium sulfate is used as a fertilizer. Ammonium persulfate is a strong oxidizer (thus works as an etchant). Ammonium sulfate (NH4)2S2O4 - - Ammonium
Re: [Homebrew_PCBs] Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by Stefan Trethan
The persulfate has twice the oxygen and sulphur. The oxygen will prefer to bond with the copper rather than another oxygen, which is why it is so reactive. In
Re: [Homebrew_PCBs] Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by Jean-Paul Louis
Just curious, what is the difference between Ammonium persulfate (expensive $32/kg) and Ammonium sulfate ($9.49/20lbs bag at Walmart)? Jean-Paul N1JPL
RE: [Homebrew_PCBs] Re: Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by K5ESS
If I read the material correctly on using ammonium persulfate as an etchant; one big drawback is that it has a fairly limited shelf life. It will lose its
Re: Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by AncelB
The dilute Nitric mix I use has a Spec. Gravity of 1.215 when fresh. It goes UP as it dissolves copper. Ancel
Re: [Homebrew_PCBs] Re: Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by Harvey White
... That s very very expensive. You d possibly get better prices from a chemical supply house. The etching tank I have needs about half a kg per load. Not in
RE: [Homebrew_PCBs] Re: Mark-8 'Non-plated through holes' and 2 sided PCBs
2016-03-22 by Andrew Volk
According to a search, MG Chemicals sells ammonium persulfate. In my area Fry’s Electronics says they have it for $32/Kg. I hadn’t thought to look