Just a quick update with the standard aluminium. I built a burnt copper version and saw the same voltage but a tiny increase in amperage, 30uA, to 160uA, 0.568V.
It's now on test with the other one and i'll try leaded solder too.
Here's that cell and, btw, i've started using a different coil type for 'Penny' type oscillators. Ya know those small silver pots on old radios ? well it's the ferrite inside that can be turned with a small flatblade screwdriver. 150 winds of 40 gauge from a relay, then a twist to form the center tap and then carry on with another 150 winds. Just another type of coil.
It's now on test with the other one and i'll try leaded solder too.
Here's that cell and, btw, i've started using a different coil type for 'Penny' type oscillators. Ya know those small silver pots on old radios ? well it's the ferrite inside that can be turned with a small flatblade screwdriver. 150 winds of 40 gauge from a relay, then a twist to form the center tap and then carry on with another 150 winds. Just another type of coil.
![](http://i10.photobucket.com/albums/a129/slider27/shot0143.png)
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