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Test a Bi-polar Transistor (out of Circuit)
To keep it simple..
great ideas! Thank you! Very creative. My gf thinks I collect too much electronics other ppl throw away and now Imy cell phone collection will grow even more. Just in case ;). In general I salvage electronics at a rate where I get scared. Where is the world going? Most things I find arent even broken anomore. Xbox 360, microwave, power tools, photo equipment, . Lost count of all perfectly ok or mildly malfunctioning stuff I found only this year..
Im thinking of installing a small solar cell on the roof of my car as a "topping charger". Maybe thats something for your trailer?
I would say what you are doing is another question, to the verge of off topic for this fantasticinstructable about charging Li-ion batteries.
Im fiddling with solar power and My advice is attaching a cheap regulator circuit designed for solar panels. Thats why I want to learn about Li-ion charging.. Cause I want to do it with solar power. I havent yet managed to make any workaround to get rid of the led acid battery yet but until then its not that cool.