Homebrew PCBs

Well there wouldnt be any point in teaching a dead dog to roll over and play 
dead?




________________________________
From: Donald H Locker <dhlocker@...>
To: Homebrew PCBs <Homebrew_PCBs@yahoogroups.com>
Sent: Sat, February 26, 2011 6:49:39 PM
Subject: Re: [Homebrew_PCBs] Question for the chemistry majors !!

  
You can't teach a dead dog new tricks. All other dogs may or not be educable.

As for me, I've got a big print job due tomorrow for the ballet company. No 
chem, electronics, programming, ... fun tonight.

Donald.
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----- Original Message -----

> From: "Randy S." <rj3819@yahoo.com>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Saturday, February 26, 2011 5:50:13 PM
> Subject: Re: [Homebrew_PCBs] Question for the chemistry majors !!
> 
> Wow .. its fun updating my own posts .. lol
> I guess I have to be careful what I wish for .
> ( I knew I should have taken chemistry comment )
> I went to you tube and found 35 berkeley lectures
> 50 minutes each on chemsitry 1A , which I would assume is
> like Chem 101 ..  ;) 
> Now the question is, can you teach an old dog , new chemistry LOL
> 
> Is everyone suffering from friday nite hangovers? 
> 
> Randy - N2CUA
> 
> 
> 
> 
> ________________________________
> From: Randy S. <rj3819@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Sat, February 26, 2011 4:35:31 PM
> Subject: Re: [Homebrew_PCBs] Question for the chemistry majors !!
> 
>   
> hmmm no replies yet .. 
> I did find this though .. 
> 
> * If the concentration of a particular ion is high, it will be
> selected to be 
> discharged even though it is higher in the electrochemical series
> compares with 
> another ion present in the solution. 
> 
> * For example, if dilute hydrochloric acid is electrolysed, hydrogen
> gas is 
> given off at the cathode and oxygen gas at the anode. 
> 
> * However, when concentrated hydrochloric acid is electrolysed,
> hydrogen gas is 
> still given off at the cathode, but chlorine rather than oxygen gas
> will be 
> released at the anode, even though chloride is in a higher position in
> 
> electrochemical series
> * 
>  
> I knew I should have taken chemistry LOL
>  
> Randy
> 
> ________________________________
> From: Randy S. <rj3819@...>
> To: Homebrew_PCB <homebrew_pcbs@yahoogroups.com>
> Sent: Sat, February 26, 2011 12:52:10 PM
> Subject: [Homebrew_PCBs] Question for the chemistry majors !!
> 
>   
> I'm not talking about Chemistry.com here either ..lol
> 
> Ok .. using muriatic acid .. with the hydrochloric acid in it mixed
> with 
> peroxide.
> 
> I looked a chemelec's website where he uses sulfuric acid and
> electrodes
> to remove over 90% of the copper, then finishes the board off in
> ferric 
> chloride.
> 
> So .. I thought if should work with other acids .. 
> I put a electrode in on the negative lead and a scrape piece of board
> on the 
> positive lead, started cranking up the voltage .. and it did indeed
> start 
> drawing
> current and bubbling .. no ventilation so I shut it off right away ..
> 
> 
> The questions are :
> He mentioned gases from the electro-etch process, which makes sense
> as
> there are bubbles .. which are toxic .. I assume the gases from his
> acid would
> be different then the gases from mine. Chemistry majors ?? What is the
> gas
> being released from my H2O2 and HCL LOL
> Some kind of a hydrogen chloride gas ?? sounds toxic and flammable ..
> lol
> 
> I was thinking I would make a setup to use my solution, aearate the
> tank and
> use some electro-etching, if that what it is , to help the process
> along ...
> 
> Sound ok ? Would there be problems with that ?
> 
> thanks all
> 
> Randy - N2CUA
> 
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> 
> 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> ------------------------------------
> 
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> Photos:
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