Re: [Homebrew_PCBs] UV laser exposure
2004-10-06 by Adam Seychell
... Where did you get 4 seconds from ? Shouldn t the time to expose 1cm^2 be equal to: 100mJ/cm^2 / 25mW * (1cm / (0.09cm * 0.09cm)) = 493 secons = 8 minutes.
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Re: [Homebrew_PCBs] Re: Using Photoresist Spray
2004-10-06 by Earl T. Hackett, Jr.
This is similar to the doctor knife method to make small samples of experimental dry film resists. Works fine. I suggest a beveled stainless steel straight
Re: [Homebrew_PCBs] UV laser exposure
2004-10-06 by Earl T. Hackett, Jr.
I m writing a reasonably detailed explaination on the use of photoresist for the traintools group. The polymerization reaction generated by UV light in
Re: [Homebrew_PCBs] UV laser exposure
2004-10-06 by Cristian
Hi Thomas, My posting was meant to open a discussion in order to avoid making films or other transparencies. Of course, multiple UV LEDs will do the job, with
PCB Event - San Jose Oct 14&15
2004-10-06 by Joanna
PCB Event - San Jose Oct 14&15 PCB Technology Symposium Oct 14 and 15 – Attendance is free http://www.regonline.com/?17227 PCB dilemmas, who doesn t have
[Homebrew_PCBs] UV laser exposure
2004-10-06 by Thomas
Hi Christian I am looking at your calcs from another angle here trying to figure all this out.... I d like to know more about your Calculation if you d care to
Re: [Homebrew_PCBs] Re: UV laser exposure
2004-10-06 by Cristian
Sorry, wrong direction: It was NOT about a photo plotter. My idea was to use a plotter with an UV pen to expose directly the Photosensitive PCB!! No film is
Re: UV laser exposure
2004-10-06 by mikezcnc
Jon Elson is the autority, he s done one and he s been using one for years. http://pico-systems.com/photoplot.html I tried to go that route and I am half way
Re: CuCl etching - the aftermath
2004-10-06 by Steve
... You ll think that s a good idea until you get a heavy splash on you and find your clothes hold it against your skin. You need something impermeable
CAM Software
2004-10-06 by lanz_24
hi! i was wondering wha are the better CAM softwares around? What are those that i can download for free? thanx in advance!
Cheap laser printer
2004-10-06 by upand_at_them
If anyone needs a cheap laser printer for toner transfer there s a good deal on a Samsung laster at Office Depot. It winds up being $70 after rebate. You can
UV laser exposure
2004-10-06 by Cristian
http://www.crystalaser.com/ has QUV 355-25 Crystal Laser of 25mW at 349 or 351 or 355nm, just inside the photoresist window. I don t know how much it is, for
Re: [Homebrew_PCBs] Re: CuCl etching - the aftermath
2004-10-06 by Anthony Toft
... They had 2 one gallon containers sold together in a box. As I told my pool owner friend, if I thought I d use even half of it I wouldn t have minded, but
Re: CuCl etching - the aftermath
2004-10-06 by Phil
... Glad to hear of your success. That s definitely the HCL doing the etching. You can get 1 G quantities at home depot, lowes, ... ... I did not see it
Re: [Homebrew_PCBs] Re: Using Photoresist Spray
2004-10-06 by Russell Shaw
... 11g/Lt of sodium hydroxide is ideal for developing prp. It is important that the pcb is free of oil before coating with prp.
Re: Using Photoresist Spray
2004-10-06 by Leon Crowther
Although I have not tried it myself, It was suggested to me that for best results a layer of uniform thickness is essential. So to accomplish this place the
Re: [Homebrew_PCBs] Re: CuCl etching - the aftermath
2004-10-06 by Stefan Trethan
... Yes, it is the reaction. it will not heat up if you have less H2O2. Be careful, such etchants have gone throught the wall it is said and also killed
Re: [Homebrew_PCBs] Re: CuCl etching - the aftermath
2004-10-06 by Anthony Toft
Well, I got about half a pint of HCl from a friend with a pool (I could only buy 2 gallons minimum) and made ~150ml of etchant (100ml of 3% H202, 50ml of 31.5%
Please trim your posts
2004-10-05 by Jim Miller
Whether you are posting from the Yahoo page or from your newsgroup software on your PC please trim your posts. It s very annoying to get huge digests with
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode UV LED
2004-10-05 by Adam Seychell
Here is another interesting article on photoresists exposure. http://www.circuitree.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2133,3647,00.html
Re: [Homebrew_PCBs] some question as a beginner........
2004-10-05 by Adam Seychell
... This is a Homebrew PCB forum, so we generally do not PTH and not we don t do it for money. Your may get better response posting on
Re: [Homebrew_PCBs] Homebrewing a laminator
2004-10-05 by Esteban Arias
Yes, I am working with Eagle to draw the schematic of the fuser circuit. I hope can ending this weekend and then send or upload the schematic. (sorry, I am
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by Cristian
There are UV optical fibres used by dentists to fix tooths. The small patches are hardened by UV using a flexible fibre from the UV box to mouth. Cristian ...
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode UV LED
2004-10-05 by Thomas
some interesting stuff here and a How To on UV .... :) http://www.uvprocess.com/ ... From: Thomas To: Homebrew_PCBs@yahoogroups.com Sent: Tuesday, October
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode UV LED
2004-10-05 by Thomas
does anyone have any info about the photo Resist UV Spectrum range for Kinsten Presensitized PCB s ? I would like to look at this Laser/ UV LED in more
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by Cristian
My idea was to use it on a UV sensitives with a plotter, without a film or transparency. Not to expose UV sensitive boards through a film as usually. A thin (
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by Russell Shaw
... I just made a lightbox that uses a 125W mercury vapour HID bulb (was thinking of using a 400W bulb for a while;)
Re: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by Stefan Trethan
... would the fiber pass UV (it is VVVERRRRRYYY thick after all). I mean there must be a reason they use quartz glass, are fibers quartz glass? ST
Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by Cristian
Steven, why not use a powerful enough UV Bulb, some lenses and an Optical Fibre? Cristian ... Outgoing mail is certified Virus Free. Checked by AVG anti-virus
Re: [Homebrew_PCBs] Homebrewing a laminator
2004-10-05 by Stefan Trethan
... I ve done mine and Esteban Arias (earias@vertice.cl) has done his with my schematic and it worked well too. I have not much time right now, but i m sure he
Re: Homebrewing a laminator
2004-10-05 by Steve
You might check on the Printer Repair list. http://groups.yahoo.com/group/printerrepair/ Steve
Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-05 by sciciora
I did some thinking about this as well. I found on this list that some pre-sensitised PCB are sensitive in the range of 340 to 400 nm, and peak at about
some question as a beginner........
2004-10-05 by laxminarayan malpani
i m planning to set up a pcb manufacturing company..... will anybody suggest me which process is better for the pattern transfer for pth boards screen
Re: [Homebrew_PCBs] Question about ultrasonic cleaner
2004-10-05 by JanRwl@AOL.COM
In a message dated 10/4/2004 12:56:31 PM Central Standard Time, jboavida@multidigital.com writes: Other said that said that regular water with some drops of
Homebrewing a laminator
2004-10-05 by Keith Applegarth
I would like to turn an old laserjet fuser assy into a laminator. I was wondering if anyone had a wiring diagram for the assy? The one I have has 2-3plug
Re: Using Photoresist Spray
2004-10-04 by crankorgan
1.Clean board 2.Shake can before each use.(What I did not do the first few times) (in the dark with safe light) 3.Tilt board upright on 45 degree angle 4.Spray
RE: [Homebrew_PCBs] Using Photoresist Spray
2004-10-04 by Leon Heller
... All the resist should have disappeared where it was exposed to the UV. ... Warm ferric chloride etches in less than 10 minutes for me with continuous
Re: [Homebrew_PCBs] Question about ultrasonic cleaner
2004-10-04 by Stefan Trethan
On Mon, 4 Oct 2004 18:54:17 +0100, Joaquim Boavida ... Hi, could you please try if toner is cleaned off by ultrasonic? I try for ages to find someone with a
Using Photoresist Spray
2004-10-04 by gmc_za
I ve started fiddeling around with photoresist spray and developing it using caustic soda, and have a few questions as the board is still not coming out 100%
Question about ultrasonic cleaner
2004-10-04 by Joaquim Boavida
Hi, list I d just purchased a small ultrasonic cleaner in EBay. I wonder as is the best liquid solution to do the job. I don t want to pay lots of money for
Re: OHP Film & Laser Printers
2004-10-04 by Steve
... Inkjet run through a Laser Printer ? ... disolves easily when washed in water, ... method with an Iron or a Laminator.... comments ? ... I tried. The
Re: [Homebrew_PCBs] Re: CuCl etching
2004-10-04 by Stefan Trethan
... Same here. But after years (2 or 3) salt forms on the ouside of the bottle. also the plastic gets dimples. i put it in a cutoff outer bottle so i
Re: [Homebrew_PCBs] Re: CuCl etching
2004-10-04 by Adam Seychell
... Nylon is a commonly used plastic that doesn t survive in acid. Identifying plastics can be done with the burn test. To check if nylon burn some of it and
Re: CuCl etching
2004-10-04 by Phil
Agreed, glass is far better but... 31% HCl is sold in the US (probably elsewhere) in plastic gallon bottles. I ve had one sitting in my basement from when I
RE: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-03 by Leon Heller
... The wavelength needs checking, to make sure it is correct. The power also needs to be checked, I don t think that UV LEDs will have enough power. Leon
Re: OHP Film & Laser Printers, UV Laser Diode
2004-10-03 by Mike
... for bringing this up !! but during a few search s I come across some info that uses a UV Laser Diode in a DVD-R Burner & goes on about Photoresist being
Re: CuCl etching
2004-10-02 by Phil
... In Seattle, I found it at a Lab Supply place in the phone book but it wasn t as cheap as others have reported ($15/4 oz or $40/gal). ... As others have
Re: [Homebrew_PCBs] Re: CuCl etching
2004-10-02 by Stefan Trethan
... For some time (months) yes, see my other post, the HCl will form crystals on the outside in a year or so. glass is better. ST
Re: [Homebrew_PCBs] Re: CuCl etching
2004-10-02 by Anthony Toft
... I was considering doing it outside, I have heard that it releases Chlorine... ... Where can I get 30% H2O2 from? Will they have it a home depot? I am
Re: CuCl etching
2004-10-02 by Phil
I did this recently using the same recipe. It worked very well for the first etching session but a few days later, the etchant was flat (for lack of a