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David Ashton
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Ferric Chloride
David Ashton   10/15/2013 6:04:09 PM
Fossicking aorund on the internet, I found the "mystical bubbly reaction" that makes ferric chloride:

Hydrogen peroxide can reduce iron(III) ions to iron(II) ions:

H2O2 + 2Fe3+ -----> 2H+ + O2 + 2Fe2+

If you really want the full equation, it would be

H2O2 + 2FeCl3 -----> 2HCl + O2 + 2FeCl2

I see it turns some of it back into Hydrochloric Acid (HCl) which must be why it was so unkind to clothes......

Crusty1
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Re: Ferric Chloride
Crusty1   10/16/2013 3:48:52 AM
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Hi David,

Much the same circuit board development time line for me. I somehow seem to be stuck in the Veroboard trap, I use Tiny Cad to capture the circuits and VeeCad to layout the Veroboard circuit, saves a lot of heart ache from putting a link or hole in the wrong place.

Now I am getting forced to use SMD footprints I have got my head around Eagle but not yet Design Spark, I like Cad drawing system that give a 3D view of the components and circuit, but free versions seem hard to find, or ones not with some user limit. My pension makes me a miser, just as I was when I had only pocket money.

Good Article forgot how the Dalo pens inked up my fingers.

David Ashton
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Re: Ferric Chloride
David Ashton   10/16/2013 4:39:09 AM
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@Crusty1 thanks....re SMD I did something with them not too long ago and successfully used my Niche PCB designer for it.  There might be something on that in the not too distant future.  You're certainly more adventurous than me with new stuff!   I'm not yet on pension but have a wife and a mortgage....'nuff said....

Crusty1
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Re: Ferric Chloride
Crusty1   10/16/2013 5:00:55 AM
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Hi David,

At the level I am working at in retirement I think I am going to get my first PCB fabed using Fritzing, Just seen the link here on ee-times. I like the intuitive bread boarding approach and they have a 6502 processor outline already so the shield I want to build for the Papilio One to emulate the UK101 looks a distinct possibility.

May be max would like an article on starting out with Fritzing?

David Ashton
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Re: Fritzing
David Ashton   10/16/2013 5:42:41 AM
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Hi Crusty....  "May be Max would like an article on starting out with Fritzing?"

I'm sure he would, but best get it from the horse's mouth.

Meanwhile, could you post a link either to it or to the EET article where you saw it?

 

Crusty1
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CEO
Re: Fritzing
Crusty1   10/16/2013 6:31:04 AM
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@ David, Max

The EE-Times  link is here http://reprap.org/wiki/PCB_Milling

Funny thing the link was in one of your posts.

Klick to the section on Fritzing, I especially like it as it is available for Mac OS.

They seem at home with SMD, so I am very much going to give it a go.

@Max if you can with stand furthur articles from Crusty Mansion's then I will write a piece about getting my first Fab done by Fritzing?

Direct link is http://fritzing.org/

Best Crusty

David Ashton
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Re: Fritzing
David Ashton   10/16/2013 7:42:00 AM
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@Crusty...."Funny thing the link was in one of your posts."   Yeah right, I'm getting old.....if you'd said reprap I would have cottoned on.... :-)   I kinda skimmed thu the article at the time, thinking I would get back to it.  Good thing you have a longer attention span!

Crusty1
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CEO
Re: Fritzing
Crusty1   10/16/2013 8:56:32 AM
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@David :  Good thing you have a longer attention span!

Mrs Crusty thinks I do not have enough attention span for the things she thinks are important and that I have a far too permenant attention span to things electronic.

Probably enough said

kfield
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Re: Ferric Chloride
kfield   10/16/2013 10:15:57 AM
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@davidashton David, sounds like you had as much fun messing around with chemistry as you did with electronics!

antedeluvian
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Me too!
antedeluvian   10/16/2013 10:28:48 AM
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David

Our progression through PCB layout tools sounds quite similar as I described in Max's How it Was series. However I never tried making my own PCBs until after university and then only once.

When you said that Rhodesia was not the centre of the electronics universe, you were understating by a long shot. In 1967/8 my electronics course was mainly valves (tubes to the the bilingually challenged) and you certainly didn't need PCBs for those. I know that I have a few years on you and I was in Bulawayo and not Salisbury, but my teachers were never of the goto variety. They were more of the talk softly (and by that I mean little content) and carry a BIG stick variety. My physics teacher even suggested that I was no good at electronics and that I should give it up. 45 years later I reflect and think maybe he was right!

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