Lets see if I understand that one right. It looks like a common PWM-circuit realized with a n555 timer chip switching the coil With a LED telling you it's on and a switch to turn it off. Usualy something like this is used to control a small direct current motor. But there is an antenna (if thats what the coil represents) connected at the output pin of the n555? I would love to be able to read the numbers first but it sure does look like one.