Homebrew PCBs

RE:
Just because you find articles on the Internet, that\u2019s not a proof of 
good engineering practices.
There is a lot of garbage in the Internet, but there is also a lot of 
good stuff. It is just not easy to find the right ones.


I do agree that the internet is full of lots of unworthy projects 
described in detail.
BUT
I built a radio for $7 that heard France CW ... and I would NEVER have 
done that if I
had not sumbled across HOW to do that on the internet.

So
finding this battery article and asking the chemistry questions is just 
my way of
getting a few opinions and hopefully some facts or suggestions HOW to 
build a
battery that can actually be used to run a tube radio using readily 
available and
not so exotic materials.













On 01/16/2017 02:04 PM, Jean-Paul Louis louijp@... [Homebrew_PCBs] 
wrote:
>
> Hi Rob,
>
> Beside having fun experimenting, what would be the use of such awfully 
> low performance battery? the article claims high internal resistance 
> and 0.25V capabilty.
>
> It looks like this battery uses zinc and copper ions to work. I think 
> that there are other ways to make a much better battery with these 
> parameters. But picking those two metallic ions does not explain the 
> low voltage of said battery.
> According to the website at 
> http://www.engineeringtoolbox.com/electrode-potential-d_482.html, Zinc 
> potential is -0.76V and Copper is +0.34V, so a good battery with those 
> elements should have a max of 1.1V, with an average probably around 
> 1V, which is a lot better than the 0.25V advertized.
>
> Just because you find articles on the Internet, that\u2019s not a proof of 
> good engineering practices.
> There is a lot of garbage in the Internet, but there is also a lot of 
> good stuff. It is just not easy to find the right ones.
>
> As a side note, you can see on the table that lithium has a potential 
> of -3.04V, which explains why lithium ion batteries are the hot topic.
>
> Just a few thoughts,
> Jean-Paul
> N1JPL
>
> > On Jan 16, 2017, at 2:22 AM, Rob roomberg@... [Homebrew_PCBs] 
> <Homebrew_PCBs@yahoogroups.com> wrote:
> >
> > what is sulfate of zinc and acidulated water and saturated copper 
> sulfate crystals ?
> > Do we have any chemists out there?
> >
> > I found an old time article how to make a battery and it specified
> >
> > sulfate of zinc and acidulated water and saturated copper sulfate 
> crystals
> >
> > http://www.learnmorsecode.com/regen2/battery02.jpg
> >
> > The article said to use ZINC SULFATE
> > or
> > ACIDULATED water.
> >
> > So I got look up ZINC SULFATE on the web and is says we can buy 
> 220mg zinc sulfate capsules...to eat.
> > huh?!!??
> > edible batteries?
> >
> > Zinc Sulfate (220mg) - 100 Capsules
> > Zinc sulfate is an inorganic compound and dietary supplement. As a 
> supplement it is used to treat zinc deficiency
> >
> >
> > but hey...it did say "OR"
> > and when I look up acidulated water it said
> >
> > wiki:
> > Acidulated water is water that an acid has been added to it, usually 
> lemon juice, lime juice or vinegar. Citric acid and ascorbic acid can 
> also be used.
> >
> > Acidulated water can be made by combining 1.5 tablespoons vinegar or 
> 3 tablespoons lemon juice.
> >
> > sooooo...... OK... this doesn't sound real toxic or dangerous to 
> show and tell kids battery chemistry....
> >
> > AND THEN
> > there is the saturated copper sulfate....
> > which is readily available at th eharware store
> > ROOT KILL copper sulfate pentahydrate 99%
> > and instructions on the web say:
> >
> > First, you need a saturated copper sulfate solution so the crystals 
> can form as the liquid evaporates. All you need to do to make the 
> solution is to stir copper sulfate into very hot water until no more 
> will dissolve. There are two ways to grow the crystals.Apr 26, 2014
> > How To Grow Blue Copper Sulfate Crystals - Science Notes and Projects
> > https://sciencenotes.org/how-to-grow-blue-copper-sulfate-crystals/
> >
> > OR
> > just buy 10 pounds of crystals from a seed supply house for $32.
> >
> > So is this feasible or would parents be pissed if they knew their 
> kids were near these chemicals?
> >
> >
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