step-up or joule thief or.. ?
November 19, 2009
I`m trying to convert the wireless doorbell outside from battery to a renewable source such as solar or wind. My problem lies in that the battery required is a 9v.
My first thought was to produce a high enough voltage to charge the 9v but that might require more solar panels than I have. The 2nd idea was to use a lower voltage battery or super-cap as replacement and stepping up the voltage to 9v. I haven`t taken any measurements of current usage but I don`t imagine it could be more than a couple hundred mA while pushing the button and much lower in idle.
The joule thief circuit is very simple and can make 3v out of 0.5. Would simply adding more turns to the coil make a higher voltage? Or should I look at a capacitor charge circuit instead? I haven`t given much useful information but maybe someone who has had more experience with solar power or any kind of simple voltage boosters could give some advice on where to start looking?