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I've progressed a little further with this, with low current switching through power transistors, and it's a whole lot smaller.
Two ways to do this - mechanical switching as shown, or digital with a microprocessor. Either way I need switches of some kind. The whole thing could be automated, but at this stage, I see no practical advantage.
I notice that the switch voltage determines the load pulled on the 12v circuit. I think this might depend on the transistor properties.
Last edited by rcheshire; 16-02-2013 at 04:38 PM.
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