Hello Rik,
Yes, aluminium seems to be not a good choice. I've now stacked 3 lemon
batteries and added 4x4700uF in parallel (unfortunately i cannot find
the 10F gold cap that i thought i have here) but the voltage quickly
drops to 15 mV (!) when i connect the PA :-(
Some more images:
https://dl.dropboxusercontent.com/u/19882028/MF/20140224_213046.jpg
https://dl.dropboxusercontent.com/u/19882028/MF/20140224_215944.jpg
I'm going to try Zn now. Hope to find some plates...
73, Stefan/DK7FC
Am 24.02.2014 21:48, schrieb Rik Strobbe:
Hi Stefan,
I am not sure that alumium is good for making lemmon batteries, as it oxidizes
almost instantly. The thin oxide layer protects the metal from further
oxidation (so you won't see any oxidation), but it might affect the standard
potential.
You can try Cu-Zn. That works fine a shold produce +/- 1V, so you will need
some more lemmons ;-)
73, Rik ON7YD - OR7T
________________________________________
Van: [email protected] [[email protected]]
namens schaefer [[email protected]]
Verzonden: maandag 24 februari 2014 21:03
Aan: [email protected]
Onderwerp: LF: Lemon transmissions
Hi MF,
I've bought some lemons and started to build a lemon battery. According
to http://de.wikipedia.org/wiki/Elektrochemische_Spannungsreihe (or
english:
http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page) )
i've decides to use aluminium and gold (pure, 999.9 :-) ) for the
electrodes. But somehow the voltage is just 1.3 V for 2 elements in
series. Actually it should be 6.4V! I have to check if there is maybe a
short cut or so.
This is the arrangement:
https://dl.dropboxusercontent.com/u/19882028/MF/20140224_205538.jpg
Later i will make some tests in WSPR-2 as DK7FC/L :-)
If you have a receiver available that is "free", i would be happy for
some WSPR reports.
But first i want to improve the battery.
73, Stefan/DK7FC
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