An exemplary driving circuit for a light-emitting diode having a positive terminal includes a resistor having first terminal and second terminal, a field-effect transistor, and a width-pulse modulation circuit. The age of the player is verified at the retail location and a separate verification password is entered via a terminal that is in communication with to the lottery system central computer, with the password linked to the game authorization code. The agent removes mercury from process streams. In some embodiments, the hangers may further include additional safety andor positioning components. The signal is transmitting off the pad through non-contact couplings such inductive coupling or optical couplings after being converted into signal formats enabling non-contact transmission.