Joule thieves......

The latest robot I'm building is one that has a Joule thief circuit in it.There are basically two types of JT circuits I think:the simple one :

And the more complex one which uses more components but also allows you to use a coil with two ends:

For this particular project I choose the more complex one,because I wanted to use the components as parts for the robot.So,two resistors became arms,the two transistors eyes(with eyelashes!),the coil a mouth,the capacitor a handbag and another resistor a necklace.I also used two extra green LEDs for the eyes.All in all a pretty complex build with lots of wires going around...