Re: [Homebrew_PCBs] drill bits
2008-02-16 by lists
In article , ... I use solid Carbide. You can often get re-sharpened ones they are cheaper than new. ... With
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Re: [Homebrew_PCBs] Re: Inkjet Transparency
2008-02-16 by Leon
... From: javaguy11111 To: Sent: Saturday, February 16, 2008 6:04 AM Subject: [Homebrew_PCBs] Re:
Re: [Homebrew_PCBs] drill bits
2008-02-16 by Leon
... From: Chuck Kelsey To: Sent: Friday, February 15, 2008 9:16 PM Subject: [Homebrew_PCBs] drill
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-16 by Stefan Trethan
Yes, if you buy the same number of LEDs.
Re: [Homebrew_PCBs] Re: Inkjet Transparency
2008-02-16 by Russell Shaw
... All the epsons one were, but i don t know if they still make it. The crappier ones like HP have a sandpaper-like coating, but still work to a degree.
Re: Inkjet Transparency
2008-02-16 by javaguy11111
... I am more concerned about light scattering. Is there a clear type of inkjet transparency?
Re: [Homebrew_PCBs] Inkjet Transparency
2008-02-16 by Russell Shaw
... The gelatine coated ones can get a bit cloudy from humidity absorbtion, but i ve never had a problem with it blocking uv.
Inkjet Transparency
2008-02-16 by javaguy11111
Are inkjet transparencies normally cloudy in appearance? I am concerned that diffusion of the light could cause features to washout.
Re: drill bits
2008-02-16 by javaguy11111
I bought my drill bits at drillbitcity.com . I manage to break the smaller ones through my clumsiness before they wear out. They have some good variety packs
Re: UV laser diode replacing laser diode in a laser printer?
2008-02-16 by pork_u_pine2000
... I too think that converting a laser printer would be difficult for the reasons given. A steered & focused laser *could* work. The refinement of the
Re: [Homebrew_PCBs] Digest Number 2406
2008-02-16 by Markus Zingg
I may try that if I will end up building another one, but hey mine - with aparently the worest placement (20mmx20mm square) works perfectly. Sometimes this
Re: [Homebrew_PCBs] Digest Number 2406
2008-02-16 by Donald H Locker
I hope someone is experimenting with hexagonal placement of the UV LEDs. A square pattern is guaranteed to have the greatest non-uniformity for the number of
Re: drill bits
2008-02-16 by Dennis
Hi Chuck, I use carbide bits, something around 0.029 for most things, 0.035 for header posts and 0.041 for TO-220 and trimmers. You should use a drill press
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by agscal -AGSCalabrese
Yes, for a given number of LEDs covering a specified area, there is no difference in time between scanning and fixed LEDs. If you buy enough LEDs to expose
Re: liquid photoresist
2008-02-15 by jcarlosmor
I suppose that he is regarding the professional photoresist (not KPR, Positiv20, and so on, that stuff is useless). The professional photoresist comes in
drill bits
2008-02-15 by Chuck Kelsey
How about drill bits for PCB work? What s the best size for DIP IC s, resistors, etc? How about a good supplier? Do s and don t about drilling - speed, backing
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by Myc Holmes
http://hackedgadgets.com/2007/02/24/uv-led-pcb-exposure-scanner/ TANSTAAFL! Myc ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by Stefan Trethan
if you use an old flatbed scanner you d have all the moving parts for that (and the board could remain in place, which is always good). BUT the drawback is
Re: [Homebrew_PCBs] Re: liquid photoresist
2008-02-15 by guja
8 x12 = 4 eurocards. about 4ccm. Ben wrote: Any idea as to how much it takes to cover a board, say 8 x 12 Where do you buy it
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by agscal -AGSCalabrese
Why not make a line of LEDs spaced 7-8 mm apart. then push the photoresist board underneath the LEDs at a constant speed ? If your line is 160 mm long you can
Re: buying LED's for a exposure box
2008-02-15 by pgdion1
I hate it when people think ... Wow, great idea Myc. Just offsetting each row by half the grid would probably be a lot more even. It may not matter a lot but,
Re: UV laser diode replacing laser diode in a laser printer?
2008-02-15 by D
... I d expect the optics to be a bit of a trick. Note that the laser diode in a laser printer is scanned, usually via either a rotating mirror or a hologram,
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by Leon
... From: James Bishop To: Sent: Friday, February 15, 2008 6:42 AM Subject: Re: [Homebrew_PCBs] Re:
Re: [Homebrew_PCBs] Re: liquid photoresist
2008-02-15 by Peter Seddon
In my opinion I would stay away from it. It usually comes in a spray and the difficulty is getting an even layer without any particles in - almost impossible
Re: liquid photoresist
2008-02-15 by Ben
Any idea as to how much it takes to cover a board, say 8 x 12 Where do you buy it from? Have you tried it? Ben
UV laser diode replacing laser diode in a laser printer?
2008-02-15 by Steve
... Not crazy. I recall a past conversation on this but don t recall the outcome. I suspect exposure time would be a problem. Photoconductor drums are very
Re: buying LED's for a exposure box
2008-02-15 by Steve
... You should start your own thread for this. Steve Greenfield
Re: buying LED's for a exposure box
2008-02-15 by Steve
... I have a quicker, cheaper (maybe better?) idea: just put a sheet of bright white paper in place of the PCB. They get paper white by putting brighteners
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-15 by Markus Zingg
Hi Adam, The space is 6 cm. HTH Markus
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by Markus Zingg
I think it just does not matter that much. As noted earlier, I can SEE a difference on the exposed laminate, but this does not influence the result after
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by Myc Holmes
All of the designs so fr have used a rectangular grid. Since the output is circular in shape, why not take a clue form the honey bees and set up the LEDS in a
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by agscal -AGSCalabrese
Even LEDs from the same batch cannot be trusted to have the same brightness for the same current. After they age, it is even less likely that they will match.
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-15 by Russell Shaw
... You could measure the intensity spread by using a photodiode behind a pinhole in alfoil.
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-15 by James Bishop
This gave me an idea.. I wonder if it would be possible to replace the laser diode in a laser printer with a uv one, and then run a sensitised board through in
Re: buying LED's for a exposure box
2008-02-15 by javaguy11111
I went ahead and placed an order for some as well. I am wondering if just doing simple current limiting resistors is sufficient or if a proper LED driver chip
Re: buying LED's for a exposure box
2008-02-15 by wimmie262000
... I guess it can. Look here: http://hackedgadgets.com/2006/10/31/uv-led-pcb-exposure-system/ There is a photo with 5 LEDs that are giving less output. They
Re: [Homebrew_PCBs] Re: buying LED's for a exposure box
2008-02-14 by Adam Seychell
... BestHongCong looks like the best so far. Their LED s are rated at 11mW and don t know what that translates to in mcd. Anyway the specs are better than the
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-14 by Adam Seychell
... That s good to hear it works despite the visible pattern. What is your space between the LED and PCB ? I guess the larger the distance the greater the
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-14 by Stefan Trethan
Can a digital video camera see UV LEDs? I know it can see IR, but i dunno about UV. It may be useful to judge differences and illumination pattern if it can.
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-14 by Adam Seychell
... Thanks Ross. It looks like ebay is the best to get LEDs for this project. Diffusers only undermine light undercut. When I m pushing the limits out of what
Re: buying LED's for a exposure box
2008-02-14 by pork_u_pine2000
... I bought about 100 of each of these grades from BestHongKong and they seem entirely satisfactory. I was looking at the absorption maxima for organic
Re: buying LED's for a exposure box
2008-02-14 by zip1zip1zip1
I to have been looking at using LED s for an exposure unit. Since most photo resist for PCB board are in the range of 350 - 420 nm. I was looking at Led s
Re: [Homebrew_PCBs] Laminator modifications
2008-02-14 by Stefan Trethan
I did not buy a laminator to modify it, i took a copier fuser unit instead that i had already. Most older fuser units from copiers or printers are quite
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-14 by Ross McKenzie
... Hi Adam, Twelve months ago I bought 50 UV leds from an ebay seller in Homg Kong for US$1.99 plusd US$11 postage. One was dead on arrival but the others
Re: [Homebrew_PCBs] buying LED's for a exposure box
2008-02-14 by Markus Zingg
Adam, I do have a 20mm grid spacing, and I m so far satisfied. Even though it never formed a problem of any kind, one can SEE the grid on the resulting exposed
buying LED's for a exposure box
2008-02-14 by Adam Seychell
Hi, I m wondering if anyone knows where is a good place to buy = 100 UV LED s for home made PCB exposure box ? There are two sellers on eBay that I have
Re: [Homebrew_PCBs] Re: Laminator modifications
2008-02-14 by Myc Holmes
One caution when replacing the thermostat; the el cheapo laminators have a very small safety margin (in order to keep costs down). So watch it very carefully
Re: [Homebrew_PCBs] Re: Laminator modifications
2008-02-14 by Chuck Kelsey
I would have guessed that there might be two bi-metal disk thermostats in there, but will check. However, you made me smile with the overkill method you used
Re: Laminator modifications
2008-02-14 by josemj1
Chuck, I modified a cheap ($30) laminator I bought at Wal-Mart, by letting a process controller like this one control the temperature:
Laminator modifications
2008-02-13 by Chuck Kelsey
OK, new question related to the problem I believe I was having. Who has modified their laminator to either produce a higher heat or longer (slower) processing