Joule Robbin' Hood: Powering a grow lamp from nearly empty batteries

摘要

Even if your camera, mouse or keyboard says that its batteries (AA or AAA) are flat, this does not mean that they are exhausted. In many cases there's still quite a bit of juice left in the batteries, which you can put to good use. The circuit described here is based on the famous Joule Thief and is guaranteed to suck batteries dry.