Not closed loop - open loop, stepper driven. ... it?...
17711
Barry Hitchen
panzer2uk
Feb 1, 2007 12:46 pm
Chris, I only started to use this method last week, when I ran out of photo resist board. I have made about ten boards now with 2 failures which was due to the...
17712
Derryck Croker
derryck_croker
Feb 1, 2007 2:10 pm
... I shorted the switch out on my laminator as a quick and dirty test. The next thing that happened was the over temp. fuse blowing! I noted also that the...
17713
Stefan Trethan
stefan_trethan
Feb 1, 2007 6:23 pm
On Thu, 01 Feb 2007 13:46:30 +0100, Barry Hitchen ... Hey, good to hear someone else is using verbatim paper. Which is yours, is there any number or weight or...
17714
Lez
lez_briddon
Feb 1, 2007 6:35 pm
Ok I am seeing the same problem with this 'working' paper as my other papers, and now I'm on a laminator, not an iron.... My problem is when I heat the...
17715
Stefan Trethan
stefan_trethan
Feb 1, 2007 7:10 pm
... I see something similar with my paper, it tends to rip off the board outline if i do not draw a second, wide, outline around it to anchor the paper to the...
17716
Lez
lez_briddon
Feb 1, 2007 7:44 pm
... I'm sure it not the paper, got to be the copper, but I cant see why only a few of us (well 2!) seem to see this. Unless its more noticeable with some...
17717
DJ Delorie
djdelorie
Feb 1, 2007 8:03 pm
... I've gotten in the habit of outlining my boards too. For the green TRF, it also helps reduce wrinkles....
17718
Stefan Trethan
stefan_trethan
Feb 1, 2007 9:06 pm
... no, remember that's stuck to glass fibers. ST...
17719
Lez
lez_briddon
Feb 1, 2007 10:15 pm
... And that does not expand? (looks for tape measure and a hot iron........)...
17720
Stefan Trethan
stefan_trethan
Feb 1, 2007 10:58 pm
... Sure does, but paper seems to expand or contract much more. Try it. The expansion coefficient of copper is mostly irrelevant because the PCB is much...
17721
Lez
lez_briddon
Feb 1, 2007 11:28 pm
Just noticed maplin now sell sodium persulphate and fecl......... I've never heard of sodium persulphate before, I dont read all the posts, just mainly the TT...
17722
Lez
lez_briddon
Feb 1, 2007 11:28 pm
Ok I have had enough tonight of TT I need to get 10 little 2 inch * 2 1/2 inch boards done. (only holds a pic and some transistors) I can buy the developer for...
17723
Lez
lez_briddon
Feb 1, 2007 11:41 pm
Anyone any comments on the UV lamps on ebay for drying nail varnish? seach on ebay with "UV nail lamp" Or what about those CCFL lights to put inside the PC...
17724
Leslie Newell
les_locost
Feb 1, 2007 11:56 pm
The exposure is fairly critical, especially if your film doesn't have very high contrast. You can use sunlight but it is very hit-and miss. You need bright...
17725
Leslie Newell
les_locost
Feb 2, 2007 12:05 am
I don't see why one of those nail lamps wouldn't work for small boards. You do need some method of holding the film firmly against the board. Any gap between...
17726
Lez
lez_briddon
Feb 2, 2007 12:16 am
... I've noticed they also sell replacement bulbs, much cheaper than the real type of bulb, in a pack of 4. I may try sunlight first, I only need to make 2...
17727
Leon
leon_heller
Feb 2, 2007 3:54 am
... From: "Leslie Newell" <lesnewell@...> To: <Homebrew_PCBs@yahoogroups.com> Sent: Thursday, February 01, 2007 11:56 PM Subject: Re: [Homebrew_PCBs]...
17728
Cristian
cristianbip
Feb 2, 2007 6:41 am
... Leon, could you let me know how the paper/fiberglass is? Two layers or how? Copper is on what layer? Cristian...
17729
Stefan Trethan
stefan_trethan
Feb 2, 2007 7:52 am
... Just another board material, the copper is still on the outside. You can see descriptions here: <http://www.felsweb.com/lam_faq.htm#B> There was also a...
17730
Leon
leon_heller
Feb 2, 2007 8:20 am
... From: "Cristian"; <bip@...> To: <Homebrew_PCBs@yahoogroups.com> Sent: Friday, February 02, 2007 6:41 AM Subject: Re: [Homebrew_PCBs] Photo exposure ...
17731
twb8899
Feb 2, 2007 12:17 pm
... Mercury vapor bulbs will work the best and give the fastest exposure. Another way is to get a cheap 500 watt quartz halogen work lamp and use it for UV...
17732
dpersuhn
Feb 2, 2007 12:36 pm
I have a few questions about the mis-pro direct inkjet printing method. I saw it mentioned that the durabrite inks may soften during etching, is the same true...
17733
keith
kabowers336
Feb 2, 2007 3:09 pm
... 30 years or so ago I made a BUNCH prototype boards both at home and at work using #2 photofloods (IIRC 300W). A sheet of plate glass to hold the film in ...
17734
Bert
bertd.geo
Feb 2, 2007 3:24 pm
... Hi Lez, I used to do photo all the time. It's easy once you get the times down. I used the positve board stock as the process is easier and the results...
17735
Len Warner
hejsek2005
Feb 2, 2007 3:44 pm
Don't bother with UK sunshine - unless you only want to make boards for a few minutes on one morning a year. Its far too unpredictable: your tests, and your...
17736
laxt57@...
laxt57
Feb 2, 2007 3:49 pm
Hi I have given up on TT, so I am gonna try photo method. How do do the artwork(photo mask)? By that I mean what sort of transparency, printer etc? Jeri ... ...
17737
Lez
lez_briddon
Feb 2, 2007 3:52 pm
... lol your right their. ... Now that seems a good idea, if 'standard' white tubes work, then all I need is some 'energy saving' lights, usually about 8 or 11...
17738
Lez
lez_briddon
Feb 2, 2007 4:04 pm
... Actually thats a good question, I'd not given much thought to that, I only have about OHT sheets left, and those are for inkjet, and I'd sooner use the...
17739
Leslie Newell
les_locost
Feb 2, 2007 4:18 pm
What sort of inkjet have you got? Epson Durabrite ink produces very good quality prints. For some reason red seems to work best. I find toner tends to end up a...
