Just looking through things and came across this one I setout some time back never built it but would work.
I did an electronic version of it somewhere if anyone’s interested.
Still had moving parts but used reed switchers and transistors to do the switching.
This circuit is able to charge your PDAs, Ipods, Mp3 players and any device that plug in to a computer USB to charge. If you fit this circuit in a small box with a 9V battery then it will become a portable emergency USB charger travel batteries
This circuit is able to charge your PDAs, Ipods, Mp3 players and any device that plug in to a computer USB to charge. If you fit this circuit in a small box with a 9V battery then it will become a portable emergency USB charger travel batteries
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