They’re so simple, you can buy a class D amp chip for $3, but [George] thought that would be too easy. Instead, he built his own with an ATTiny and an H-bridge motor driver. No surprise ...

[Dikos] over at grobot, slapped together some gutted micro servos, an Arduino pro mini, H bridge chip, and a solar key-chain charger to make this little three wheeled cutie. The robot boasts ...