Add Yahoo as a preferred source to see more of our stories on Google. Replacing smoke alarm batteries can be a hassle. It always seems that just as soon as you've installed fresh ones, the low-battery ...

With just a low cost DC adapter and the circuit described here it is possible to build a low cost stabilized, uninterruptable 9V supply. On the grounds of safety and economy, a simple unstabilized 12V ...

Hi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot of things and here is where I document my learning in order to be able to inspire other people to make ...