Rolf

The etching solution is made by adding 1 part Muriatic Acid (the common kind that's sold in hardware stores, about $5.00 gal.) to 2 parts Hydrogen Peroxide (the common 3% kind that's sold in dollar stores & drugstores for $0.50 a pint)

Warning!!!!!!!!
Mixing is a hazardous process (add acid to the peroxide, not the other way around!)

The board pictured below was etched in five minutes at room temp.


For more info. go to:
http://www.pbase.com/sinoline/pcb_experiments

Question: To save Press-n-Peel someone talked about taping it to a regular sheet of paper. I have been reluctant to feed tape through my laser jet. Any comments?
.

Hero999

I like your cheep etching solution.

Press-n-Peel is a waste of money, I just use ordinary magazine paper. Just print your circuit onto it, iron to a clean piece of copper clad board and wast it off with water.

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Rolf

The etching solution is not really mine, I am just trying to get the word around. I should have mentioned that the Hydrogen Peroxide is only $ 0.50 a pint.
That works out to about $ 13.00 for three gallons of etching solution. And no shipping because it is available locally, even in a little hick town were I live.

"Press-n-Peel is a waste of money". Not if you tried many of the others with very limited success and a lot of frustration. Maybe there are differences in the different manufactures toners?
No frustration is worth a lot to me.

Hero999

Heck, I use photo resist board for real PCBs, it doesn't work out that expensive, it's probably cheaper than Press-n-Peel.

It's easy to build a UV exposure, the cheapest way is to lay your board with the artwork on top on a table held down with a peice of glass. Use compact black light for the UV source, the easiest way is to put it in an old desk lamp and direct the beam at your PCB.

http://www.maplin.co.uk/Module.aspx?...ia=UV&doy=25m8

I know there are probably cheaper places to buy these from and don't use the incandesant type they're crap and don't last for very long.

Look, here are some cheaper alternatives:
http://www.blacklight.com/items/FTBPESL13T-BLB
http://www.bulbman.com/index.php?mai...ducts_id=11675 - needs a holder with ballast though.
http://www.doityourself.com/invt/0307207

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bobledoux

I've had great luck with the Pulsar.gs paper. SMT's with .010 inch traces work all the time, when using a cheap heat laminator. I also use ferric chloride rubbed on the board with a small sponge for etching.

I have enough junk. I don't need more specialized equipment to do basic boards.

Oznog

It's cheap and works, but muriatic acid is pretty darn strong even at 1/3rd concentration. Mixing is a hazardous process (add acid to the peroxide, not the other way around!).

Actually there is a guy on eBay who sells bulk ferric chloride chunks in 10 lb lots for $40, shipping included. Etching solution actually takes quite a bit of solid per liter, but $4/lb is pretty darn affordable. You might want to find somebody else in town to split this much material with.

http://search.ebay.com/search/search...de+&category0=

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Hero999

Wikipedia says otherwise.

http://en.wikipedia.org/wiki/Piranha...on#Preparation

Which way is the safest, acid to peroxide or peroxide to acid?

You could always glue it using a glue stick I suppose. By the way (I can't remember if it was you) said they have had problems printing on magazine paper. They's said it got jammed in the printer. Well you could always try glueing it to a nomal piece of A4 paper.

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CRayD

I've been using this solution since Moses was in short pants, but I would add a few comments. The fumes are TOXIC!!! do the mixing and etching outside!! and do not breath the fumes. Heating the solution to about 100f will speed up the etching dramatically. Also using a bubbler will speed up the etch and even it out across the PCB. The solution saturates rapidly, figure 1 oz. solution to 1 sq.in. of 1 oz. copper. The solution can't be easily rejuvinated. The soution will turn a pale green (the dissolved copper) as it saturates. Discard the used solution diluted 1 to 5 or better in water with a couple tablespoons of BiCab down the toilet.

evandude

I'm one of the people who recommends that. I just use normal clear/scotch tape and it's never shown any signs of melting or anything. It certainly extends the use of a sheet of press-n-peel... personally I do a lot of small boards and I can often get dozens of boards out of a single sheet, and at around $1.50 a sheet that makes the cost of the press-n-peel practically negligible in my opinion.

I've become interested in CuCl2 + HCl etching, as seen at: http://members.optusnet.com.au/%7Ees...uCl/index.html
That formulation has the advantage of being regenerable by simply bubbling air through it, and at most occasionally adding some water or more (cheap) acid. The hard part, as I gather from that page, is making the solution in the first place, as you need to purchase or make the CuCl2, and it can be very expensive to purchase, at least from chemical supply places. However, I found both Copper (II) Chloride and Copper (II) Oxide for sale at a fireworks supply place (skylighter.com) very cheaply (less than $10 a pound). I would like to talk with someone who's a bit more knowledgeable about chemistry before getting into this type of etching (for safety guidelines, and to make sure I know exactly how to monitor and regenerate it, so I don't ruin it), but it definitely seems appealing never having to throw out my etching solution, instead just being able to keep regenerating it, even if it means I have to put in a little more effort to storing and regenerating it.

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Rolf

Thanks, I'll try the tape, it will probably save me about 50% that is now going to waste.
I agree that Press-n-Peel is a bargain, got mine for $ 1.00 / sheet but I had to buy 30. So now I have enough for a lifetime.

evandude

Another tip for the tape method:
the general method is to print the pattern on plain paper, then tape the PnP on, and print again; this way you can cut the PnP to just barely larger than the pattern and have very little waste. But, that means the first pass is a pretty big waste of toner. When I am doing designs that have a lot of copper area (and thus use a lot of toner) I usually open up the pattern in an image editor and change the color to a very light gray and print that the first time, or quickly draw an empty rectangle the size of the pattern and print that the first time.

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Rolf

To save toner; it is simpler {for me (when using PCB123)} to just draw a rectangle around the traces, then delete the trace layout. Then print just that layer, no need to go to a separate program. Lastly re-load the trace file and print your p-n-p.
But for small board I don't even bother.

jolino

Hi Rolf,
I use "acetate" (A4 transparent film) are years on my HP1100 and no problem until now.

Regards

jagrolet

I have been using regular "Scotch Tape" for years to get the most out of my Press & Peel (the same method as "evandude"). I have never had a piece stuck in my laser printer or even had a piece come loose from the paper and Press & Peel. Ill continue using this method, but Im definately going to try the Muriatic Acid & Peroxide instead of the expensive Radio Shack ferric chloride. Man are they proud of that stuff.

muki55

cool good etch