First attempt at an arm

dontlaugh February 12, 2016, 6:43am 1

this is my first attempt at an arm

so keep the giggles to a minimum

when i power it from batteries 4xAA 6v its very jittery

but when i power it from a 5v mains supply its fine

what am i doing wrong ?

https://www.youtube.com/watch?v=1eSQwm6Xu7s