Years ago, when diesels were blue and the dreadful woman from Grantham had yet to decimate British manufacturing industries I spent a few years on the railway learning how to make things work with wires. During that time, and with easy access to simple electronic components I made a hand held controller that required a 12v dc feed. I'd also assembled the components for another two.
Fast forward thirty years and i found myself staring at a 9v battery and thinking that if i could house this within the hand held unit then I could make a very lightweight and portable unit to power my tiny trains.
Here's the proof of concept lash up.
and here's it working ....
