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A nice easy to follow document for those that have never used uv before - well done.
Nowadays I tend to use Press-n-Peel for my prototypes.
PCB design on screen, send reversed image to Laserjet 6L.
Use a standard clothes iron - non steam - to transfer the toner onto the copper, remove excess then etch as normal.
I've recently used this system for making a dsp - motherboard, processor daughter board and codec daughter board - for a new transceiver I'm building - designed by Peter Rhodes G3XJP and published in RadCom.
As this uses a lot of smd including AD1885JST and ADSP-2181 KS160 chips I was a bit sceptical - even having seen pictures of completed boards using p'n'p.
I tried it and got excellent results now I use it most of the time.
Only one problem with this for most people (within the UK) is the cost - approx £15 for 5 sheets - approx 11 x 8.5 inch per sheet - from RS, CPC and Maplin - when they have it in stock.
I supply this to the members of a large user group with the UK at £1.50 per sheet + p&p.
well, you got beter ways to do the pcb s, but i use feric clorhide and markers.
noe, the only thing i worry about is transferiing the image of the pcb i have designed on the computer to the board. how?
the way i am using now is look at it and drwa it by hand.
i could use a laser printer, but the ones i have accesible need to bend the paper so no posibility to print directly.
so anybody got any ideas on how to do that better, considering that there are no other ways to do the pcb , just feric clorhide?
The problem I had was trying to get the P n P to adhere to the board.....no matter how much cleaning, degreasing etc........I couldnt get satisfactory results......I only wanted to make a board 3*2 inches and like I say I used all of the stuff trying to do it........
well, i tried it and it seems to work, i wonder if it works with a page copied at a xerox machine...
o, and by the way, what do i clean the ink with after i make the pcb?
also got a question, how do i get better results, using a highter temperature and shorter time, or lower temperature and longer time?
i mean the temperature of the iron.
ok, thanks for the advice, i mean the problem was not how to get it off, i would figure a way for thant, but know i know. maybe it works with medical alchool? ill try.
another thing about the temperature, the highter the better?
shall i turn the iron on hotter?
With p-n-p the etch resist is on the p-n-p. The toner fuses to the copper and p-n-p.
Having worked in a few pcb manufacturers I know the processes they use to clean the boards prior to use and in most cases their way of thinking is... If the preparation is cr@p the results are cr@p.
With COLD water, wet a soap-impregnated wire-wool pad and use it to polish the copper - reducing the pressure as you go - until it is immaculate. From this point do not touch the copper.
Wash off all traces of soap with COLD water and a clean paint brush.
Dry it with uncoloured kitchen paper.
Then use some more uncoloured kitchen paper to clean it using acetone, isopropyl alcohol or cellulose thinners. Do this in a WELL VENTILATED area.
Heat the iron to approx 140 C - cotton setting - it should just scorch plain 80gsm copier paper.
Use one or more sheets of clean paper between the pnp and the iron you can then continue to follow the manufacturers instructions.
DO NOT use a standard ironing motion or you will smear the trace.
Too much pressure on the iron will smear the trace.
Too little pressure will not transfer the artwork.
The etch resist can be cleaned off with cellulose thinners.
Practise makes perfect.
At least one major pcb manufacturer in North West Uk began switching to a film transfer method 12 months ago. More will follow, especially as it is more environmentally friendly and less chemical storage means reduced costs.
I had tried toner method but it did not work with plain printer paper. I then got some glossy sheets which worked well but the next time I went to buy those sheets, I could not get it of the same manufacturer and it did not work. The sheet got stuck to the copper clad very badly and I had no other option than throwing it.
So all those who want to try direct LASER toner method, use good quality glossy paper which should leave the ink as soon as heat is applied.
i found some cheap notebooks that have the paper quite like photo paper, it is so fine that you cant write with a pen or a pencil on it at all.
i think that i could use that, cause photo paper is ....expensive.