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- Path: sparky!uunet!mcsun!sunic!chalmers.se!me.chalmers.se!dana
- From: dana@me.chalmers.se (Dan Andersson)
- Newsgroups: sci.electronics
- Subject: Re: PC masks from a laser printer??
- Message-ID: <12977@chalmers.se>
- Date: 27 Jul 92 22:22:10 GMT
- References: <1992Jul27.065039.5734@lugb.latrobe.edu.au>
- Sender: news@chalmers.se
- Lines: 37
-
- MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham) writes:
- : Dear Knowledgeable ones,
- : Up until now I have made my PCB's using donut and tape transfers on
- : overhead proj film, exposing Electrolube +ve resist on the copper.
- : However, as I have now entered the compuer age and bought a cheapy
- : PCB CAD program, I need to produce masks from a laser printer.
- : I tried the obvious (direct print on transparency), but the result
- : was sufficiently porous that the copper looked like a 1/2 tone printers plate
- : after etching. What should I do? I'm going to try inking over the printed
- : bits on the mask, but that doesn't leave me a long way in front of the
- : stick on donut method.
- : Thanks,
-
- Graham
-
- Here comes a method.
-
- There is a special transparent film for laser-printers sold here in Sweden,
- that you use for PCB-making, it's probably an American product and you can also use common laser-transpars with good result...
-
- Makre your PCB-design, be aware of the scale so that the printed transparent is
- EXACTLY scale 1:1 AND a MIRROR printout.
-
- Try to turn the tonermix adjustor so that you get a nice black printing.
- Take an iron, ( not your wife's/ mum's ! ). Let it reach a temp that don't
- melt the plastic translar.
- Take your VERY clean virgin-PCB and put the translar on it with the carbonlayer down against the cu. Use the iron to press and heat the translar.
- let the PCB and translar rest and chill. Remove GENTLY ( yes, you will need
- some practice ) and voila, there is ( hopefully ) the carbon-layer
- transferred to the coppersurface.
- Now you can use a soft chemical like cu-oxide to process your PCB.
-
- Don't try to large surfaces. If you need to do large constructions, try to
- meke them bit by bit , by masking off with plastic tape during etching.
-
- //Dan Andersson dana@theta.me.chalmers.se
-
-