As i said in my previous posting, the difference is either pre-sensitized boards or a can of spray-on sensitizer, and a UV-source. KreAture ----- Original Message ----- From: "Jai Dhar" To: Sent: Tuesday, April 01, 2003 7:37 PM Subject: Re: [EE]: Etchant tank > Since this thread has (naturally) progressed to track drawing methods, it has > peeked my interest into this UV business. So let's say I would want to get away > from Sharpie's, what are my options? 1) Buy a laser printer (which I don't > exactly have the money for), transfer onto some special paper and then iron on > the tracks? (I might not have the method exactly right, but something along > those lines??). 2) The UV method... anything else? If I wanted to do UV, what > do I need? Can I do it with regular copper clad boards, or do I have to > get "pre-sensitized" boards. How much am I looking at to build a UV box? Or do > I need a box? Someone mentioned simply using their desk lamp.. is it possible > to just get a UV tube and do it this way? I'm totally foreign to the idea of UV > transfer, and the recent postings have both informed about it, yet confused me > about the process. > > Thanks again, > > Jai > > Quoting Mike Harrison : > > > There are 3 types of tube commonly available : > > 1) 'Blacklight' - used for effects lighting - these look black - not used > > them, they may be > > suitable, but may extend exposure time > > 2) Insect killer tubes - these look while (like normal tubes) when off - > > these are the ideal type > > for PCB exposure > > 3) Germicidal (also for eprom erasers) - These look transparent - they emit > > shortwave UV hazardous > > to skin and eyes, and are no good for PCB exposure. > > > > > > On Tue, 1 Apr 2003 11:24:00 +1200, you wrote: > > > > >> On Tue, 2003-04-01 at 12:17, Kyrre Aalerud wrote: > > >> > I use 3x 4w UV tubes and need 15 minutes for single transparancy and 30 > > >mins > > >> > for double. > > >> > Are you perhaps using 30w tubes ? (I'm trying to make a small compact > > >> > lightbox as the one I have is clearly too low power... > > >> > > >> My small commercially made light box has two 8W tubes and takes about 4 > > >> minutes per side (it can only expose one side at a time). Maybe your > > >> tubes are putting out the wrong wavelength of UV? > > > > > >There are "black light" UV tubes and long wavelength germicidal tubes. You > > >want the latter. > > >Black light tubes are dark almost black when off and a very deep purple > > when > > >running. > > >Germicidal etc tubes are usually clear and have a violent purple look when > > >you look at them - for a few seconds anyway - don't do it ! > > > > > > > > > RM > > > > -- > > http://www.piclist.com hint: To leave the PICList > > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > > > > > ---------------------------------------- > This mail sent through www.mywaterloo.ca > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu