My favourite toy. Electrically it's very simple, but the complexity of the mechanical system is quite astonishing.
Other favourite toys: Big Big Train (very rare now), Johnny Astro and Computacar
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https://www.youtube.com/watch?v=tgnbEFuSlXY
Crypto mining is profitable today, so I'm running all 3 of my L3+ Antminers. But it is getting pretty warm in the shed. 30C before I switched off one of the miners. Also I've fitted a copper link wire between two of my lead-acid powerwall batteries.
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https://www.youtube.com/watch?v=nbmpJluarQ8
Placing the two 17Ah 12V gel lead-acid batteries on the shed floor. Lots of moisture collected on the side of the batteries (the wall side) when they were high up on a shelf. Since they've been down on the floor, they don't seem to attract the moisture. Bought a Ryobi soldering iron specifically for in-shed soldering.
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https://www.youtube.com/watch?v=PQhhY9gqOrQ