If the ez-b didn't turn on, that adapter may have had the incorrect polarity. The polarity is positive (+) in the middle of the plug, and negative (-) on the outer side of the plug. The plug is actually called a Barrel Plug or Barrel Jack.

Most of the transformers that you will find around the house are not digital switching. They use a transformer, which is two wounds of wire at a ratio which conducts electromagnetically across the two and produces a lower voltage in respect to the wire ratio. What that means is, those transformers literally only contain a spool of wire that lowers the input voltage by a pre-defined ratio. Then a simple Diode is used to flatten one line of the AC current to produce simulated DC current.

In short, a transformer power supply is not a great selection to power a robot. A digital switching power supply is the best option - specifically one with providing between 6 and 8 volts DC current at more than 6-8 amps for your application. If you add more servos, the number of amps will need to be increased.

If you want to get crazy, use a PC power supply That's what we use!

Like a power cord that I have for my laptop? Mines a ac adapter that has an output of 19 volts and 3.42 A

Noooooooo! 19v is a way too much.... Once again you need 7.4V and around 10A....

This is what you need... 7.5V Meanwell power supply

I'm not going to use it don't worry. ok I'll check it out.

You should buy this though....7.4v 5200mAh Lipo You can use the ez robot charger to charge it. It is a big battery that will last much longer than the 1300mA ez robot battery...

I use the basic 6 aa batteries. They last about 5 hours, so I think for now I'll get more to swap out.

Wow, 5 hours on the 6 aa batteries is great! I would not have expected that. I'm looking forward to seeing a video of your robot when he's ready!

Sure! Here's a link right here. I hope it works. I'm teaching him to talk to people.

m.facebook.com/story.php?story_fbid=1193718590641563&id=100000103010376