Cheap and good PCB etching solution..... - Page 4 - Electronic Circuits Projects Diagrams Free

kasamiko · 25th June 2008, 05:40 AM

Can i used the one that is used as wound disinfectant?

**3v0** · 25th June 2008, 07:04 AM

I know this is a reply to a rather old post.

Instead of laser labels I use 3M blue painters tape. It is less gooey.

Pulsar transfer paper is very good but it may be hard to find outside the US. It has a starch coating that disolves in water. If your laser printer can print it, it will end up on the PCB. Neat stuff.

Quote:

Originally Posted by Gordz

Having tried many methods over the years, including printing onto magazine pages,photo-resist etc. and I would say Press-n-Peel is one on the best I have found. It is quick, easy and fast and I have had spectacular results for my SMD work and double sided boards, with achievable edge definition and fine track widths far better than using paper. I use laser labels to stick correctly sized pieces of P-n-P to normal A4 sheets and have not had a 'jam' on my laser printer yet. As for cost, a 20 sheet pack shipped to Sheffield UK from Techniks in the USA is US$64.50 or about £33.00 which compared to Maplin where you get 5 sheets for £15.52 which is almost twice the price at £3.10 per sheet ! and you have to collect.

Rolf · 25th June 2008, 05:49 PM

Quote:

Originally Posted by kasamiko

Can i used the one that is used as wound disinfectant?

I am pretty sure it is the one we are talking about. The stuff I use said on the bottle: "First Aid Antiseptic Oral Debriding Agent".
Active ingredient: Active ingredient: Hydrogen peroxide (stabilized) 3%

Gordz · 26th June 2008, 09:17 AM

Peroxide is the 'common' name, it is a a bleach for hair and an antiseptic. It comes in different strengths, and loses strength whilst stored. The 'strength' can be measured by the volume of oxygen which is liberated from a given volume of Peroxide on an organic matter sample.

Why are we asking this ?

Gordz · 26th June 2008, 09:19 AM

Quote:

Originally Posted by 3v0

Pulsar transfer paper is very good but it may be hard to find outside the US.

Sounds great, I don't know if it is available here in Australia, or what the price is though.

**3v0** · 26th June 2008, 10:09 AM

Quote:

Originally Posted by Gordz

Sounds great, I don't know if it is available here in Australia, or what the price is though.

It is a good product. Digikey and Mouser sell it in North America.

If I lived in a country where Pulsar did not have a distributor I would give them a call and see if it was possible to setup a distributorship.

Gordz · 3rd July 2008, 09:34 AM

That USB bit wacker looks great ! Is the xtal only for the USB ? ie the PIC can still run at 32mHz ?

**3v0** · 3rd July 2008, 10:10 AM

I think the USB and processor can run from the same clock source.
But but you can decouple them to go into a low power mode where the processor slows down but the USB is still active.
A quick look at the datasheet.

Quote:

Asynchronous dual clock operation, allowing the
USB module to run from a high-frequency
oscillator while the rest of the microcontroller is
clocked from an internal low-power oscillator.

Gordz · 5th July 2008, 04:26 AM

Thanks for the info 3v0, when I get time I'll take a closer look. I need to migrate to USB........

ece_jm · 5th July 2008, 03:00 PM

Quote:

Always Add Acid To Water --- Not Water To Acid

--------------------------------------------------------------------------------

A good way to remember this is use the alphabet...A to W not W to A...
The explanation is simple..if you have a high concetration Acid (let's say sulphuric acid 10 mole) which would eat through any type of metal, if you would slowly dump the acid into water, the reaction can be controlled by the pouring of the acid into the water.

Let's say you dump the water into acid, then you would have a little bit of water reacting with a large amount of acid as the pouring process starts.
This is very dangerous because of the large amount of concentration of acid is going to react with every molecule of the water, giving off much heat.

I am no scientist but this was 8th grade bio-chem, which is basic reaction control.

Use this rule for adding acid into pretty much anything, espcially water.
-Jim

Another good point is the process of pouring a mixture.

To make the mixing safer, youy should pour the the mixture through the wall of the container, sliding the liquid slowly through the wall.

Thats the usual practice that we do in chem 1. Just an idea. Thanks!

Space Varmint · 17th July 2008, 03:09 AM

That is awesome!

Gloz · 15th October 2008, 02:18 PM

That is what I do most of the time to save on blue.

Overclocked · 15th October 2008, 05:39 PM

I could never get the H2O2 + HCL mix working, but Copper Oxide + HCL has worked Like a Charm For me. I just use a air bubbler from ebay to help it go a bit quicker and its worked pretty well over the years. Ive been using the same etching solution for quite some time now.

The only problem is that my HCL is from the dollar store (toilet cleaner, 10% HCL) and bubbles, so I have to do it in the shower. Still, for $1 I cant beat it (but the copper oxide is a different story-I have to make it from copper carbonate-which I got through a pottery store)

Mike44 · 6th November 2008, 03:41 AM

I've heard (or read) from some people that standing up the board vertically in an etch tank versus laying it down flat makes it go quicker? Just a myth or reality? I could understand that when the board is vertical, maybe the dissolved copper would 'sink' to the bottom keeping the etchant more pure around the PCB. I suppose a bubbler would just fix this problem though?

And also, I just have a question about waste disposal of muriatic acid and H2O2. I'm pretty sure that if it's toxic to breathe, it definately is not safe for a septic tank. Any suggestions? I do have access to my Chemistry lab at my University, so maybe I could bring the stuff there, since they usually have a ton of inorganic waste. Don't know how happy they would be though lol!

Mike

Wond3rboy · 7th November 2008, 08:40 AM

Quote:

Originally Posted by 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.

Hi Hero999,

i wanted to know if i get you correctly: we can use a common magazine paper to get our ckt from the printer to the PCB board?I ask this because TTP is not available in my city easily.

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25th June 2008, 05:40 AM	(permalink)
kasamiko	Can i used the one that is used as wound disinfectant? __________________ to err is human, to really mess things up, use a computer!

26th June 2008, 09:17 AM	(permalink)
Gordz	Peroxide is the 'common' name, it is a a bleach for hair and an antiseptic. It comes in different strengths, and loses strength whilst stored. The 'strength' can be measured by the volume of oxygen which is liberated from a given volume of Peroxide on an organic matter sample. Why are we asking this ?

3rd July 2008, 09:34 AM	(permalink)
Gordz	That USB bit wacker looks great ! Is the xtal only for the USB ? ie the PIC can still run at 32mHz ?

5th July 2008, 04:26 AM	(permalink)
Gordz	Thanks for the info 3v0, when I get time I'll take a closer look. I need to migrate to USB........

17th July 2008, 03:09 AM	(permalink)
Space Varmint	That is awesome!

15th October 2008, 02:18 PM	(permalink)
Gloz	That is what I do most of the time to save on blue.

15th October 2008, 05:39 PM	(permalink)
Overclocked	I could never get the H2O2 + HCL mix working, but Copper Oxide + HCL has worked Like a Charm For me. I just use a air bubbler from ebay to help it go a bit quicker and its worked pretty well over the years. Ive been using the same etching solution for quite some time now. The only problem is that my HCL is from the dollar store (toilet cleaner, 10% HCL) and bubbles, so I have to do it in the shower. Still, for $1 I cant beat it (but the copper oxide is a different story-I have to make it from copper carbonate-which I got through a pottery store) __________________ I believe that you're wrong. Insinuating that they hold the bomb. ---

6th November 2008, 03:41 AM	(permalink)
Mike44	I've heard (or read) from some people that standing up the board vertically in an etch tank versus laying it down flat makes it go quicker? Just a myth or reality? I could understand that when the board is vertical, maybe the dissolved copper would 'sink' to the bottom keeping the etchant more pure around the PCB. I suppose a bubbler would just fix this problem though? And also, I just have a question about waste disposal of muriatic acid and H2O2. I'm pretty sure that if it's toxic to breathe, it definately is not safe for a septic tank. Any suggestions? I do have access to my Chemistry lab at my University, so maybe I could bring the stuff there, since they usually have a ton of inorganic waste. Don't know how happy they would be though lol! Mike