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2007-01-06 by leon_heller
I've uploaded a photo of my simple UV exposure unit: Photos>Leon's>UV unit The black-light UV tubes are mounted in ordinary 8W fluorescent light fittings. The box is made from MDF and wood, screwed and glued together. A sheet of ordinary window glass that I had cut to size sits on the wood strips at the top of the side pieces. Exposure time is 13 minutes. Leon
2007-01-06 by scratch_6057
--- In Homebrew_PCBs@yahoogroups.com, "leon_heller" <leon355@...> wrote: > > I've uploaded a photo of my simple UV exposure unit: > > Photos>Leon's>UV unit > > The black-light UV tubes are mounted in ordinary 8W fluorescent light > fittings. The box is made from MDF and wood, screwed and glued > together. A sheet of ordinary window glass that I had cut to size sits > on the wood strips at the top of the side pieces. Exposure time is 13 > minutes. > > Leon > Nice job Leon! A lot less complicated that the one that Think N Tinker describes. Lots of Questions; Did you consider white paint inside? Diffuser plate (milk white translucent acrylic) between lamps and the glass plate? Not getting any exposure variations from the areas directly above the lamps and the area between them? I see a number of people referring to various things as Black Light, `GROW' lights, `Aquarium' fish tank lamps, Bug Zapper lamps and I remember the `Black Light' lamps that had a dark blue or purple glass, (still see them every so often,especially around Halloween) what exactly was the INTENDED purpose of the lamps you are using? How about telling us the physical size (dimensions) of that exposure unit, PLEASE. Thanks
2007-01-06 by Leon
----- Original Message -----
From: scratch_6057 To: Homebrew_PCBs@yahoogroups.com Sent: Saturday, January 06, 2007 3:34 PM Subject: [Homebrew_PCBs] Re: My UV exposure unit --- In Homebrew_PCBs@yahoogroups.com, "leon_heller" <leon355@...> wrote: > > I've uploaded a photo of my simple UV exposure unit: > > Photos>Leon's>UV unit > > The black-light UV tubes are mounted in ordinary 8W fluorescent light > fittings. The box is made from MDF and wood, screwed and glued > together. A sheet of ordinary window glass that I had cut to size sits > on the wood strips at the top of the side pieces. Exposure time is 13 > minutes. > > Leon > Nice job Leon! A lot less complicated that the one that Think N Tinker describes. Lots of Questions; Did you consider white paint inside? Diffuser plate (milk white translucent acrylic) between lamps and the glass plate? Not getting any exposure variations from the areas directly above the lamps and the area between them? I see a number of people referring to various things as Black Light, `GROW' lights, `Aquarium' fish tank lamps, Bug Zapper lamps and I remember the `Black Light' lamps that had a dark blue or purple glass, (still see them every so often,especially around Halloween) what exactly was the INTENDED purpose of the lamps you are using? How about telling us the physical size (dimensions) of that exposure unit, PLEASE. ---------------------------------------- White paint or crumpled Al foil lining would probably help. I managed to get the PCB and artwork at just the right distance to get even illumination, and the distance helps with the collimation. Knowing the tube diameter it should be possible to calculate the optimum distance but I just guessed it, and checked that it looked OK with some paper on the glass. The UV tubes I bought were sold specifically for PCB exposure (I got them from Service Trading Co. in Bridgman Road, West London). They are made by Sylvania but I don't know their intended purpose. Similar tubes are available from Farnell and RS here in the UK. The tubes are about 4" apart and 6" from the upper glass surface. I left enough room for a third tube between the existing two tubes. That would considerably reduce the exposure time. A timer would be a useful addition, but I just use a timer application running on my Palm PDA to remind me when the exposure is complete. Leon -- Leon Heller Amateur radio call-sign G1HSM Suzuki SV1000S motorcycle leon355@... http://www.geocities.com/leon_heller
2007-01-06 by Robert Blumer
Hi all, I built the UV lamp box by Think N Thinker, as per there drawing. I use Ever-Muse Positive presensitized pcb for all my pcb's exposure time 90 sec and I get very good pcb all the time. bob scratch_6057 wrote:
> --- In Homebrew_PCBs@yahoogroups.com, "leon_heller" <leon355@...> > wrote: > >> I've uploaded a photo of my simple UV exposure unit: >> >> Photos>Leon's>UV unit >> >> The black-light UV tubes are mounted in ordinary 8W fluorescent >> > light > >> fittings. The box is made from MDF and wood, screwed and glued >> together. A sheet of ordinary window glass that I had cut to size >> > sits > >> on the wood strips at the top of the side pieces. Exposure time is >> > 13 > >> minutes. >> >> Leon >> >> > > Nice job Leon! A lot less complicated that the one that Think N Tinker > describes. Lots of Questions; Did you consider white paint inside? > Diffuser plate (milk white translucent acrylic) between lamps and the > glass plate? Not getting any exposure variations from the areas > directly above the lamps and the area between them? I see a number of > people referring to various things as Black Light, `GROW' > lights, `Aquarium' fish tank lamps, Bug Zapper lamps and I remember > the `Black Light' lamps that had a dark blue or purple glass, (still > see them every so often,especially around Halloween) what exactly was > the INTENDED purpose of the lamps you are using? > How about telling us the physical size (dimensions) of that exposure > unit, PLEASE. > > Thanks > > > > > Be sure to visit the group home and check for new Links, Files, and Photos: > http://groups.yahoo.com/group/Homebrew_PCBs > > If Files or Photos are running short of space, post them here: > http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ > Yahoo! Groups Links > > > > > > >
2007-01-07 by Leon
----- Original Message -----
From: Robert Blumer To: Homebrew_PCBs@yahoogroups.com Sent: Saturday, January 06, 2007 8:42 PM Subject: Re: [Homebrew_PCBs] Re: My UV exposure unit Hi all, I built the UV lamp box by Think N Thinker, as per there drawing. I use Ever-Muse Positive presensitized pcb for all my pcb's exposure time 90 sec and I get very good pcb all the time. bob ------------------------------ I was thinking of making that one, but it involved too much work and I'm lazy. 8-) Leon -- Leon Heller Amateur radio call-sign G1HSM Suzuki SV1000S motorcycle leon355@... http://www.geocities.com/leon_heller
2007-01-08 by Derryck Croker
On 6 Jan 2007, at 16:09, Leon wrote: > White paint or crumpled Al foil lining would probably help. I > managed to get > the PCB and artwork at just the right distance to get even > illumination, and I lined the bottom and sides of mine with crumpled aluminium foil*, but never bothered to check the result with paper as you did. Distance between the two tubes and the glass are somewhere in the region of a couple of inches. The tubes were sold as spares for the ready-made UV boxes that Maplin used to sell, and the tube fittings, ballast and Terry clips to hold the tubes bought as aquarium lighting bits from an electrical store in Harrow (NW London) somewhere :-) It was my intention to fit a cutoff timer to it, but a stopwatch is sufficient for the 4.5 minute exposure time. To be honest, I tend to use toner transfer these days though as it's less fuss. *Probably a Good Idea to connect the foil to earth via an eyelet and small screw through the foil. -- Cheers Derryck
2007-01-08 by Ken Ames
where does one find the Think N Thinker plans at? Thanks Ken --- Leon <leon355@...> wrote: > ----- Original Message ----- > From: Robert Blumer > To: Homebrew_PCBs@yahoogroups.com > Sent: Saturday, January 06, 2007 8:42 PM > Subject: Re: [Homebrew_PCBs] Re: My UV exposure unit > > > Hi all, > I built the UV lamp box by Think N Thinker, as per > there drawing. > I use Ever-Muse Positive presensitized pcb for all > my pcb's > exposure time 90 sec and I get very good pcb all the > time. > bob > > ------------------------------ > > I was thinking of making that one, but it involved > too much work and I'm > lazy. 8-) > > Leon > -- > Leon Heller > Amateur radio call-sign G1HSM > Suzuki SV1000S motorcycle > leon355@... > http://www.geocities.com/leon_heller > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
2007-01-09 by Zoran A. Scepanovic
Hello Ken, Monday, January 8, 2007, 7:02:07 PM, you wrote: > where does one find the Think N Thinker plans at? > Thanks > Ken http://thinktink.com -- Best regards, Zoran A. Scepanovic zastos@... ********* Knowledge is realizing that the street is one-way, wisdom is looking both directions anyway ********* Please be advised what was said may be absolutely wrong, and hereby this disclaimer follows. I reserve the right to be wrong and admit it in front of the entire world. Local time: 06:35 [Non-text portions of this message have been removed]
2007-01-09 by Robert Blumer
http://thinktink.com should get it. Robert Ken Ames wrote:
> where does one find the Think N Thinker plans at? > > Thanks > Ken > > --- Leon <leon355@...> wrote: > > >> ----- Original Message ----- >> From: Robert Blumer >> To: Homebrew_PCBs@yahoogroups.com >> Sent: Saturday, January 06, 2007 8:42 PM >> Subject: Re: [Homebrew_PCBs] Re: My UV exposure unit >> >> >> Hi all, >> I built the UV lamp box by Think N Thinker, as per >> there drawing. >> I use Ever-Muse Positive presensitized pcb for all >> my pcb's >> exposure time 90 sec and I get very good pcb all the >> time. >> bob >> >> ------------------------------ >> >> I was thinking of making that one, but it involved >> too much work and I'm >> lazy. 8-) >> >> Leon >> -- >> Leon Heller >> Amateur radio call-sign G1HSM >> Suzuki SV1000S motorcycle >> leon355@... >> http://www.geocities.com/leon_heller >> >> >> > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > > Be sure to visit the group home and check for new Links, Files, and Photos: > http://groups.yahoo.com/group/Homebrew_PCBs > > If Files or Photos are running short of space, post them here: > http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ > Yahoo! Groups Links > > > > > > >