- on Power Supplies
- Published in issue 12/2013 on page 56
Joule Robbin’ Hood
Powering a grow lamp from nearly empty batteries
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.