Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Roland Harriston
Andrew Volk: You are quite right. I also worked in the semiconductor fabrication domain for a while, and we used spin-coating with the old Kodak KPR, and other
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Re: Seno 100 photo resist applicator
2013-04-07 by designer_craig
Ben, As the board get larger and larger it s harder to keep it balanced on the spin table so it doesn t fly off. Also it s harder to get a good coat without
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Todd F. Carney / K7TFC
Wow! That was quite a thing! 73, Todd ... K7TFC / Medford, Oregon, USA / CN82ni / UTC-8 ... QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design ... [Non-text
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Boman33
Todd, The panda is real. I had an opportunity to play with and feed seven of them in China. Bertho From: Todd F. Carney / K7TFC Sent: Sunday, April 07, 2013
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Todd F. Carney / K7TFC
... Mine is not to reason why, mine is but to do or . . . hey, wait a minute! Actually, I suspect the viscosity and surface tension of the emulsion has
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Boman33
As I wrote, I know it works but the question is why. Bertho From: Andrew Volk Sent: Sunday, April 07, 2013 02:08 Spin coating is uniform enough that it is
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Boman33
Todd, I am not arguing, just thinking..... It helps when discussing concepts to emphasize for better clarity, so: If the resists is added an inch off center, I
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Andrew Volk
Spin coating is uniform enough that it is also used in the manufacturing of silicon wafers for integrated circuits. You want to talk about holding fine lines?
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Todd F. Carney / K7TFC
*I didn t ever know the speed of what I used to use, but in comparing it in my memory with a 45 rpm record (also from memory), I d guess it was about twice
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Boman33
I know spin coating has been used commercially but it always bothered me since I do not understand how it can be a uniform coating. Basically there is zero
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by James
... How fast does it have to spin? The velocity of the outside edge of the board would be getting quite high I imagine as you increased the board size.
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-07 by Todd F. Carney / K7TFC
Ben, I think he was referring to the capacity of the spin machine he showed in the photos. I used to use spin coating, and there s no reason it can t be
Re: Seno 100 photo resist applicator
2013-04-07 by Ben L
... Why just 5 x 5 ? Are you saying that Spin Coating will not work on a larger than 5 x 5 board? I if so, Why? Ben
Re: Bulk Material
2013-04-06 by utriversong
Hi, thank you for the reply. I want to keep everything in house so my people have a job.
Re: Bulk Material
2013-04-06 by utriversong
Thank you for the replies. I have a little follow up, I have found a supplier that stocks the clad in large sheets 3 X 4 , not sensitized. The company is
Foil transfer pcb
2013-04-05 by davide_curcio_87
Hello, I m sorry if this has been dealt with before, but I can t seem to get the hang of searching in yahoo groups. The thing is, I was looking for an
Test message
2013-04-04 by Nuno Tavares
Please ignore this message, I m just checking for recent problems I had with my emails. Sorry for any inconvenience. Nuno T.
Re: Bulk Material
2013-04-04 by Andrew
Rachel, At the risk of asking something you may already have considered -- have you investigated moving production to a board house? For prototypes and small
Re: [Homebrew_PCBs] Orcad
2013-04-03 by Jake Mitchell
Thanks ________________________________ From: howard.chester To: Homebrew_PCBs@yahoogroups.com Sent: Tuesday, April 2, 2013 6:15 PM
Re: removing solder resist from pcb boards
2013-04-03 by Kim Kemmerly
Dear Alex, Try Lacquer Thinner available at most hardware stores or at walmart in the paint section. Just wet or soak some paper towels with it and wipe
Datak Photo resist
2013-04-03 by Rick Sparber
I have a bottle of negative type photo resist made by Datak. It appears to be light yellow which makes it very hard to see on the copper after being applied.
Re: [Homebrew_PCBs] removing solder resist from pcb boards
2013-04-02 by Todd F. Carney / K7TFC
There s also some citrus-based paint strippers that might also work. If you do use methylene chloride, wear gloves and avoid fumes. On Apr 2, 2013 1:52 PM,
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-02 by Todd F. Carney / K7TFC
I used a similar spin machine when I worked for a university research lab. Worked great! Todd K7TFC ... [Non-text portions of this message have been removed]
Re: Seno 100 photo resist applicator
2013-04-02 by designer_craig
If the boards are 5 x5 or less then you could spin coat the boards, it gives a fairly nice coating. see:
Orcad
2013-04-02 by howard.chester
For those interested in a useful book... Complete PCB Design Using OrCAD Capture and PCB Editor by Kraig Mitzner Download Link; - http://ul.to/8v9r58yb
Re: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-02 by Roland Harriston
... Roland F. Harriston, P.D. ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Howard Chester
Thanks for the information. Roland F. Harriston, P.D. *********************** ... If you check further down the page at Mega.UK you will find 600-031 Seno 1000
Re: [Homebrew_PCBs] removing solder resist from pcb boards
2013-04-02 by Malcolm Parker-Lisberg
Alex Dichloromethane (DCM)—or methylene chloride, commonly know as Paint stripper, beware, it will eat your board as well, so keep it away from the back and
removing solder resist from pcb boards
2013-04-02 by alexhun19
I have a fairly regular supply of single sided pcb boards, about 4 inches wide and about 20 inches long. There is only one little snag: they were used as
RE: [Homebrew_PCBs] Re: Seno 100 photo resist applicator
2013-04-02 by Rick Sparber
I m using the spray bottle version from MG Chemicals. After two tries and no luck, I m now waiting for an answer from their help line. Rick ... From:
Re: Seno 100 photo resist applicator
2013-04-02 by alexhun19
Thanks to all responders! I ll give the squeegee a try on the next batch. As Leon kindly clarified, it is a liquid resist, supplied in an applicator similar to
Re: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Roland Harriston
Leon: Thanks for the information. Roland F. Harriston, P.D. *********************** ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Leon Heller
... It s a liquid supplied in an applicator. Mega Electronics sells it in the UK: http://www.megauk.com/pcb_chemicals.php Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Roland Harriston
Pardon my ignorance, but are you using a liquid resist? If so, can you tell me what it is, and where you get it? Thanks Roland F. Harriston, P.D.
RE: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Rick Sparber
Alex, I just bought some spray on photo resist. They say to spray on a thin coat and then put the board, resist side down, on a piece of tissue paper for
Re: [Homebrew_PCBs] Seno 100 photo resist applicator
2013-04-02 by Leon Heller
... How about using a squeegee on it. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Re: Bulk Material
2013-04-02 by James
Might help if we knew how large you want. Looking at a couple of the sellers I know of in China, the largest they advertise is 26cm x 40cm single sided (if
Seno 100 photo resist applicator
2013-04-02 by Alex Hun
Been using the Seno 100 photo resist applicator to sensitize some pcb board stock. Main problem I find is getting an even coating. The applicator sponge is
Re: Bulk Material
2013-04-02 by bitsyboffin
... Of course, I mean 30cm is the limit of one edge of the board, the other edge can be as long or short as you cut off the roll.
Re: Bulk Material
2013-04-02 by utriversong
Thank you for your reply. One of the problems I have is finding large clad, I d like to increase the size so it is more efficient to produce larger numbers at
Re: [Homebrew_PCBs] Bulk Material
2013-04-02 by James
You could always use dry film rather than pre-sensitised, sellers can supply a length cut from roll, the rolls are 30cm wide which would be the limit for your
Bulk Material
2013-04-02 by utriversong
Hello, please forgive me if this has been covered before. I have been making printed circuit boards for a long time now in small scale production, but I need
Re: [Homebrew_PCBs] lye
2013-04-01 by Todd F. Carney / K7TFC
On Mon, Apr 1, 2013 at 11:09 AM, chuck richards ... I like to have a cheap pump bottle of white vinegar (any vinegar will do, actually)
RE: [Homebrew_PCBs] lye
2013-04-01 by Boman33
I enjoyed watching your video and learning more about the process. I was surprised at how good the recordings sounded. How are you using the lye in the
Re: [Homebrew_PCBs] lye
2013-04-01 by chuck richards
I work with lye all the time making Edison brown wax recording blank cylinders for antique cylinder phonographs. As long as you don t splash it up into your
File - monthly.txt
2013-04-01 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] Re: any chance stick dry film to pcb w/o laminator ?
2013-04-01 by Hari Hendaryanto
i m sorry for late reply, i got my mails end up in spam filter, i ve just noticed and released it. sounds like another solution for me, and thanks for that :),
Re: [Homebrew_PCBs] lye
2013-04-01 by chuck richards
You can dilute the lye/water solution with more water and very precisely control the rate at which it dissolves aluminum. I used the lye/aluminum reaction a
Re: [Homebrew_PCBs] Re: Soldermask UV ink/paint/epoxy
2013-03-31 by James
... Hi, can be purchased on ebay, in 10ml syringe, and 100gram jars. Some ebay items for you (search for solder mask repairing paint )... 10ml Green:
RE: [Homebrew_PCBs] lye
2013-03-31 by Donald H Locker
Spray enamel worked for covering the seco nd side of a two-sided pcb that needed protection. Stripped with lacquer thinner, IIRC. Donald. -- *Plain Text* email