DJ, From my own testing, when using the "green stuff", you actually "flattening" and evening out the toner a bit. After removing the paper, the toner is ...
... It leaves a pretty thick layer of green stuff, too. The peeled-off film is clear where the artwork was. It claims to "seal" the toner, filling in the...
I don't do anything that complex. I set the temperature on my external control to 260 *F, The $25 GBC laminator. Takes about as long to heat up as it takes to...
... My boards tend to have enough traces on them that "almost never" is often enough to ruin most boards. What toner are you using that sticks at 260F? Mine...
... If the wiki were associated with the Yahoo list, this point might have some validity. How will people who find the list find the wiki? More importantly,...
... This has also been my experience. http://techref.massmind.org doesn't require any registration to post new information. It checks for common spam words,...
I've been playing with the GBC laminator today. I jumpered one of the thermal switches so I could get a higher temperature on the 3 mill setting. I have a...
... Just getting back to this - I get a few holes in the toner in larger areas, but never actual holes through the copper. I am just fooling with this and...
... The math for step 4 seems utterly wrong though: # Calculate an initial exposure time by dividing the power output of your UV lamp (in Watts) by the total...
... I got the Microtrak and the CPD5 developer from Farnell (they're within driving distance, and it cost less to drive down there than pay the UPS hazchem...
... ThinkTink's film requires 150-300 mJ/cm2 ... That's 21 minutes. Sounds about right for an initial step gauge test. I'd use 16 just to make the math easier...
... Their website disagrees: "Exposure energy: 25-60mJ/cm^2" <http://www.thinktink.com/stack/volumes/voli/store/specs/m115spec.htm> (60-25) = a range of...
... The problem is one of units. The first number you calculated is the lamp intensity in W/cm^2=J/(s*cm^2). Your dry film dose is specified in mJ/cm^2=...
... Which seems even more off than my estimates -- other types of photoresist I've looked at specify an exposure time of between two and three minutes. The...
So get a PCB with film, cut it into strips the width of your step gauge, and do a binary search of your timer's range ;-) Really, if you have a step gauge, you...
The biggest problem, IMHO, with doing surface-mounts by hand is aligning the pins with their corresponding pads. The Schmartboard line of prototyping boards...
... I think I've sorted it... A 960-second (16-minute) exposure on CIF 0.8mm D/S pre-coated board produced a step of 11. Shifted exposure by -3 stops to get...
I've played with a schmartboard, and do fine-pitch smt by hand, and I don't see it as much of a benefit. Heck, if you're doing reflow, the parts mostly align...
... I do not have permission to use that feature :-( ... I don't have a double-sided exposure box, but... For DS boards, what I do is include targets on my...
... That would be because I left "View Attachments" set to "Admins Only". It's set to "All Users" now, so anyone should be able to see that file. ... That's...
I use an 8 year old Minolta PagePro 1250 laser printer. I have used the factory toner and remanufactured cartridges from two different sources. All give the...
Looks like you got the exposure just right. Are you using some type of vacuum hold-down? I found I had to do something about that because the weight of the...
... The UV box has a vacuum pump built in -- there are four UV tubes in the bottom, covered with a sheet of glass, then four in the top with a sheet of ...
... If you still didn't use/tried, maybe facing the paper side with ink down to the dry film and placing the uv source 1 meter apart could be an easy test. To...
Simao Cardoso
simaocardoso@...
Jun 4, 2009 12:56 am
22909
... no we can use this method "Spread a photoresist over the board about .2mm thick. Mask as...
Late reply, but: I am new to the list, but before joining i spent hundreds of hours searching for things already answered here. The list as the best people but...
Simao Cardoso
simaocardoso@...
Jun 4, 2009 2:31 am
22911
... I've been making a lot of boards with qfn parts, which I find very hard to place by hand. What I've been doing is taking a piece of thin (20 mil) fr4 and...
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