Another approach for lasers
2012-02-25 by drsage2007
Just had another idea. How about coating the PCB with a very thin layer of laser printer toner. A powder coating set up would work well for that i.e. uniform
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Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-25 by John Anhalt
The positive resists I am aware of are all 375 nm or greater. NB: incandescent lamps may put out to 350 nm. I use Injectorall, and it recommends something
Re: Novel way to expose photo resist??
2012-02-25 by Dave Sage
Just looked at the MG chemicals site and it appears they no longer offer the dry negative photo resist film. So where does one purchase small quantities of
Re: Novel way to expose photo resist??
2012-02-25 by Dave Sage
SO, can anyone quote the required wavelength of light required for some UV photo resists? The MG Chemicals exposure light is 375nm. I think it will do both
RE: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-25 by Tony Smith
... water ... was ... UV ... a board ... with UV ... Provided you can get the right laser & the right resist, it ll work fine. I ve seen UV lasers around
Re: [Homebrew_PCBs] Re: Solder Mask
2012-02-24 by Andrew Hakman
On a side note, if you have a KitchenAid or similar oven with electronic control, look under the options menu for a Dehydrate mode - that should allow you to
Re: Novel way to expose photo resist??
2012-02-24 by designer_craig
Sage, Go search the archives for Volkan, he did some great work on DLI using a blue ray laser diode mounted on a printer head shuttle. The immages resolution
Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-24 by Leon Heller
... I don t think that UV lasers have the correct wavelength for most of the photo-resist available. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-24 by John Anhalt
Depends on what wavelength of UV you are using. If near UV (e.g., 405 nm), they will work fine. John ... From: Jeff Heiss To: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-24 by Jeff Heiss
A DVD laser is IR and a CD laser is red. Would the optics from the lasers work for UV? Jeff _____ From: Homebrew_PCBs@yahoogroups.com
Re: Novel way to expose photo resist??
2012-02-24 by Dave Sage
I presume a CD or DVD burner has all the optics required to focus the laser diode to a very tiny spot. Maybe it s just a matter of swapping out the diode for
more on the conductive ink
2012-02-24 by David Mitchell
today on Hackaday: http://hackaday.com/2012/02/24/diy-conductive-ink-lets-you-freehand-circuits-on-the-cheap/ .. [Jordan] likes the flexibility that conductive
Re: [Homebrew_PCBs] problem with ink. HP inks dissolve in FeCl3 what should I do
2012-02-24 by Leon Heller
... Ink jet printer ink isn t resistant to etchants. Use it to produce transparencies. Leon -- Leon Heller G1HSM
Re: problem with ink. HP inks dissolve in FeCl3 what should I do
2012-02-24 by AlienRelics
I just posted a bunch of links about using the CD/DVD print tray on Epson printers in http://tech.groups.yahoo.com/group/Inkjet_PCB_Construction/ The problem:
Re: Novel way to expose photo resist??
2012-02-24 by AlienRelics
Those are LEDs. I suspect you d have to block a lot of the light to get it down to a spot. It is a limitation of the physical size of the LED die and the lens
problem with ink. HP inks dissolve in FeCl3 what should I do
2012-02-24 by thegulhassan
I have modified a deskjet d1460. It has c21 and c22 cartridges. It prints brilliantly but the ink readily dissolves providing no resistance to etchant.Is there
Re: [Homebrew_PCBs] Novel way to expose photo resist??
2012-02-24 by Leon Heller
... Those are LEDs, not laser diodes! Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Re: Novel way to expose photo resist??
2012-02-24 by Slavko Kocjancic
I m interested in that approach too. But little extended. The old fashion PCB process have aperture wheel. and there was different shapes on it. So instead
Re: [Homebrew_PCBs] Novel way to expose photo resist??
2012-02-24 by Kevin Impson
Hi Guys, Just started to seriously look at the inkjet pcb idea, actually looking at a Artisan 50 and another on Ebay. The plotter and UV laser can work. But,
Re: Novel way to expose photo resist??
2012-02-23 by Leslie Schwartz
I am sure many other people have had this idea before since I have as of years ago and one of my reasons for joining this group, but I have not been able to
Re: Novel way to expose photo resist??
2012-02-23 by drsage2007
Hmm. I guess the IR vs UV would be a problem. I ve seen some pretty hot blue LEDS demonstrated. I don t suppose they d hsve any UV component to the light. Then
Re: [Homebrew_PCBs] Novel way to expose photo resist??
2012-02-23 by Harvey White
... Possible, but.... ... CD burners have IR leds, not UV. You d need a UV diode/laser diode. Even then, The exposure is likely too small to affect the board
Novel way to expose photo resist??
2012-02-23 by drsage2007
Perhaps you all can comment on whether you think this flash from the past will work. Back in the day I used to plot PCB s using an old flat bed plotter with
Re: "cheap" solution for UV pcb process?
2012-02-23 by John Ferrell
I have not tried it, but this youtube video looks pretty good to me. I was especially interested in using a cfl for the light source.
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by Harvey White
... I d have thought that positioning it would have been horrible. Now you can take a transparency (reverse printed), double side tape it to the board, and you
Re: "cheap" solution for UV pcb process?
2012-02-23 by storan4wd
Hi Chris, My experience: Pre-coated boards: Good sometimes but expensive and sometimes poorly cut (raised edges have to be filed down before exposure) and
Re: "cheap" solution for UV pcb process?
2012-02-23 by twb8899
... I m thinking about offering dry film coated circuit board materials if there is any interest. I was in the printed wiring business for many years and still
Re: [Homebrew_PCBs] "cheap" solution for UV pcb process?
2012-02-23 by Leon Heller
... I used the Electrolube aerosol resist a long time ago, and it worked quite well. However, they changed the formula (probably something to do with health
Re: [Homebrew_PCBs] "cheap" solution for UV pcb process?
2012-02-23 by Benjamin Blumer
The spray s been pretty hit and miss for me. Someone on this mailing list bought a bunch of the laminate and is selling it to members. That s probably your
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by Vicent Colomar Prats
Thanks for that! 2012/2/22 cunningfellow ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by DJ Delorie
... Missed this the first time through. My driver was written for the Epson R280, which is a 2880 DPI ESCp2 language printer. I don t know what Canon
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by DJ Delorie
... I do that too sometimes, depending on the board. ... I use sheets of double sided sticky tape :-) Not very stiff afterwards, but very easy to do.
Re: [Homebrew_PCBs] Printers not making pattern opaque enough for UV process
2012-02-23 by DJ Delorie
... It just reads one file and produces another, it will run just fine on Windows. Or DOS. Or Mac. Probably on anything. The tricky part is sending that
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by DJ Delorie
... FYI using a transmission step wedge is doing the same thing as this, except it s calibrated. Since the films tell you the step number target, it means you
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-23 by DJ Delorie
... My UV LED box exposure is about 5 minutes. ... http://www.delorie.com/pcb/pbm2escp2.zip ... Depends on the ink and print head. I find the black is
Re: Printers not making pattern opaque enough for UV process
2012-02-22 by cunningfellow
I have a can of this http://www.gcctech.com.au/products/spray/index.html Works well on my HP4000 series laserjet. Can t comment on other printers.
RE: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Boman33
I saw an ad for a Chinese company marketing a device & liquid that a transparency could be put through and it would come out with very high contrast, opaque
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Leon Heller
... Sorry. It should be HP 5940. Leon -- Leon Heller G1HSM
Re: Printers not making pattern opaque enough for UV process
2012-02-22 by tda7000
... I just dug up an old whiteboard marker and gave this a shot... and it worked quite well! Before, the toner was very easy to see light through, now it s
Re: Printers not making pattern opaque enough for UV process
2012-02-22 by tda7000
... Is that printer model number correct? I can t seem to find it anywhere online.
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Harvey White
... That or eyelets. Eyelets are very large, and not the best, but I do use them for higher current. Solder them in and fill with solder. Harvey
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by David Mitchell
How do you do your vias with this scheme? soldered bits of wire? ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Harvey White
... I use 1 hour epoxy, in the large size. Costs about 15 dollars or so, you ll get a feeling of how much epoxy to use. Too thin a coat and you don t get
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Harvey White
... Half thickness board: I can get 0.023 board, which will get to 0.46 board when made double sided, which is stiff enough. If I make a double sided board
"cheap" solution for UV pcb process?
2012-02-22 by matrice197
I want to create some PCB s using the uv photoresist process. I dont often need to make boards, but would really like to do this rather than TT. Considering
Re: [Homebrew_PCBs] Printers not making pattern opaque enough for UV process
2012-02-22 by joe M
Try vellum paper. ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by Leon Heller
... That was the technique I used with my UV exposure unit (tubes). It s basically the same technique that was used by photographers for many years, when using
Re: [Homebrew_PCBs] Printers not making pattern opaque enough for UV process
2012-02-22 by Leon Heller
... I get excellent results with an HP 9540 inkjet and Mega Electronics JetStar Premium film. Leon -- Leon Heller G1HSM
Re: Printers not making pattern opaque enough for UV process
2012-02-22 by David
I print onto tracing paper, [the type schools us] two times, i.e. two seperate prints, using a laserjet printer HP1018 with the plain paper setting, stick
Re: [Homebrew_PCBs] Re: Printers not making pattern opaque enough for UV process
2012-02-22 by John Anhalt
I use a HP4101 printer and the transparencies are also speckled. I go over them completely with a black, dry erase marker (Expo brand) on the toner side. Let