Re: [Homebrew_PCBs] Reproducing a vintage computer PCB
2017-07-02 by Martin Heermance
To add to this, we re discussing this topic on the Cosmac Elf discussion forum. There s no issues with intellectual property in this case because the design
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Reproducing a vintage computer PCB
2017-07-02 by goofy_36@...
I ve been a lurker for a while and sort of new here. So forgive me if this has been talked about before. I have a unbuilt Quest Super Elf kit. What I would
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2017-07-01 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] Found vintage PCB stock
2017-06-27 by Brad
For those interested, I received my vintage PCB stock yesterday and did some test etching to see how it came out. Also did some comparison photos:
Re: Silkscreening with white toner
2017-06-20 by dougholberg@...
Good idea. Another thing i am gonna try is to roll it over the end of the board and tape with Kapton and then hold some tension on it as it goes through.
Re: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-20 by Harvey White
... try cutting it to size, then smoothing it down so it without wrinkles. This can cause a static charge that helps hold the foil to the board. Run it through
Re: Silkscreening with white toner
2017-06-20 by dougholberg@...
Per your suggestion, I bought some. Tried it today and it worked just great! The stuff is so thin, it is tricky to get it to lay perfectly flat on the board
RE: [Homebrew_PCBs] Found vintage PCB stock
2017-06-12 by Andrew Volk
One tip with epoxy (and most other glues), use cheap, clear packing tape as a mask for keeping glue off. Practically nothing sticks to it. I use packing tape
Re: [Homebrew_PCBs] Found vintage PCB stock
2017-06-11 by Harvey White
... I do that for double sided boards. You may want to use long setting (half hour or hour) epoxy depending on how fast you are. Make sure your registration
Found vintage PCB stock
2017-06-11 by Brad
I bought a whack of these: http://www.ebay.com/itm/351681662704?_trksid=p2057872.m2749.l2648
Re: Silkscreening with white toner
2017-06-10 by AncelB
Craft foil for foiling toner on PCBs, to either remove any pitting when etching the fills on the solder layer or for quality silk screening on the component
Re: Silkscreening with white toner
2017-06-10 by alan00463@...
here do you get the craft foil, AncelB ? What is it called ?
Re: Silkscreening with white toner
2017-06-06 by AncelB
Yes, I use the craft foil instead of TRF as it is far cheaper and works as well. I have both.
Re: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-05 by Harvey White
... Take the silkscreen layer for the board (should not cover pads). Reverse it and print it on paper, then laminate or iron it on the board (whichever works
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-05 by alan00463@...
Well I m planning to do black silkscreen using Ed Chew s method https://www.youtube.com/watch?v=GL0fVtREgRA https://www.youtube.com/watch?v=GL0fVtREgRA on
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-05 by Kevin Byrne
https://www.circuitspecialists.com/printed-circuit-board-supplies Here is the link. I use green trf with a Apache lam and it works good and protects with great
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-05 by Dennis Shelgren
Just my two cents. White toner is probably the most direct route. Back in the late 90 s alps wax printers could do decals that d be fairly close to perfect.
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-05 by Marc OLANIE
That s an important info :-) just a last stupid question : did you try to use it to minimize toner porosity? In other words, does it resist to acid ?
Re: Silkscreening with white toner
2017-06-05 by AncelB
I have used the purple metallic foil up to 1Ghz on 0.8mm FR4 with no probs....No apparent effect on permittivity etc.
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-04 by Brad
I don’t know why but I couldn’t make the TRF work. It always ended up lifting the toner from the board. The rare spots where it adhered it looked awful.
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-04 by Kevin Byrne
Get white trf instead as it is made for that application. I can supply a link to both green trf and white trf thru a site I buy from.
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-04 by Marc OLANIE
Thank you, Ancel. These foils have metallic particles. Unusable or risky for UHF and/or high voltage pcb. Just good enough for CC apps and arlui-like
Re: Silkscreening with white toner
2017-06-04 by AncelB
Craft foil for toner transfer: EBay item # 160937797413
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-03 by Marc OLANIE
Hi Ancel & all ... transfer pass with any type of color foil you prefer. Could you pse give a reference or URL of such a « craft foiling » stuff ? I’m
RE: [Homebrew_PCBs] Re: Silkscreening with white toner
2017-06-03 by Brad
Yeah I tried that but never had much success with it. Plus, if I can dial this in a bit better it’s one less step, one less thing to go wrong, right? From:
Re: Silkscreening with white toner
2017-06-03 by AncelB
Well, u can silk screen with regular toner, and then do a craft foiling transfer pass with any type of color foil you prefer. Gets u professional looking
Silkscreening with white toner
2017-06-02 by Brad
I finally got some white toner and made my first silkscreen! I didn t try to hard (the board was scrap), but the results are encouraging. I ve made a post on
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2017-06-01 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
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2017-05-01 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
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2017-04-01 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] Brother 420 Laser printer
2017-03-16 by Kevin Byrne
The after market has to be changed to OEM and then HP should be fine. Mine is a HP Laser Jet P2015dn and with hot transfer it works fine. It also works fine
Re: [Homebrew_PCBs] Brother 420 Laser printer
2017-03-15 by Doug Holberg
I have a Brother MFC 7860DW which I use for hot toner transfer. It works pretty well. My HP LJ1102w does a poor job. Never have determined if it was the
Re: Brother 420 Laser printer
2017-03-14 by jwood.co@...
It is 600x600dpi
RE: [Homebrew_PCBs] Brother 420 Laser printer
2017-03-13 by K5ESS
There are two popular methods for making PCBs with toner transfer. Hot and Cold. The cold method involves using a solvent mixture(acetone and alcohol for one
Re: Brother 420 Laser printer
2017-03-13 by Kevin Byrne
What is the DPI of it 1200 best 600 maybe, do you have software also to adjust settings of your printer? Is you ink factory as it is better than replacement
Brother 420 Laser printer
2017-03-13 by jwood.co@...
I have a Brother 420 mono laser printer that is not being used. How could I mod or use it for home PCB making? Is anyone aware of specific mods or uses for
Re: uv resin for a photoresist substitute
2017-03-09 by Larry Battraw
I ve had several problems with older dry-film resist, but the worst was that it was extremely difficult to get an exposure that would protect traces without
Re: uv resin for a photoresist substitute
2017-03-03 by craigl2@...
Banana oil is slang for amyl acetate or isoamyl acetate because they smell like bananas. Amyl acetate is used in lacquer thinners. Lacquer thinner, acetone and
RE: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by keith printy
Gc electronics used to make both positive and negative photo resist. I have used both ,only problem I had sometimes with the positive is getting it to adhere
RE: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by K5ESS
Butyl acetate is sometimes called banana oil because it’s odor is similar to ripe bananas. Mike N. From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by Harvey Altstadter
KPR is currently available. It is sold by Transene Company : http://transene.com/pkp/ This place also has materials and supplies:
Re: uv resin for a photoresist substitute
2017-03-02 by wa4qal@...
Yes and no, with regards to using a UV resin for a photoresist. The original popular photoresist was KPR (Kodak PhotoResist):
Re: uv resin for a photoresist substitute
2017-03-02 by jeff.heiss@...
Hi Larry, What do you mix with the photoresist to dilute it? Do you dilute the full 100g at once or dilute small amounts when you pull it out to use it? Do
Re: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by Rob
THANK YOU for the verbose explanation. I bought the cheap photo-resist but had not done any experimentation with it yet. On 03/02/2017 01:28 AM, Larry Battraw
Re: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by Russell Shaw
... ...
Re: [Homebrew_PCBs] Re: uv resin for a photoresist substitute
2017-03-02 by Russell Shaw
... ...
Re: uv resin for a photoresist substitute
2017-03-02 by Larry Battraw
Hi Jeff, I ve experimented widely in search of materials that could act as photo-imaged resist for PCBs and it has not been terribly successful. You end up
RE: [Homebrew_PCBs] uv resin for a photoresist substitute
2017-03-02 by Jeff Heiss
I envisioned a solvent would remove the cured epoxy but I think that is wishful thinking. Thanks Rob, PJH for pointing out my mistake. Jeff From:
Re: [Homebrew_PCBs] uv resin for a photoresist substitute
2017-03-02 by hickspj467@...
Oops, sorry I didn t read the question closely enough. Once it sticks it is almost impossible to get off. It will sometimes peel off depending on what it is
Re: [Homebrew_PCBs] uv resin for a photoresist substitute
2017-03-02 by hickspj467@...
I use UV resin a lot in fly tying. It has the consistency of syrup and if isolated from UV will stay soft forever. I use acetone or M.E.K. and other solvents