I wanted to buy a transformer for the speed regulator, so based on this image, I bought a transformer with 12V DC output. It works. However, discussing this with a fellow AFOL, he pointed out that ...
Several electric LEGO systems exist: LEGO Trains LEGO Technic Power Functions (PF) LEGO Mindstorms (in several versions) ...? How do these systems differ in electrical properties and which systems ...
I've recently ordered a LEGO® 8878 Rechargeable Battery Box: I was wondering if I really need to get the (rather expensive) LEGO® Power Functions Transformer or if I can substitute a (cheaper) ...