In a circuit, a high side driver control circuit outputs gating signals to a high side driver of a synchronous converter responsive to a pulse width modulated input signal. The light emitting device includes a substrate having a lead frame, a light emitting diode mounted on the substrate, a mold member formed on the substrate and the light emitting diode, and a reflecting member having an opening portion at one side thereof and being inclined at an outer portion of the mold member. Center-of-mass velocity, center-to-center velocity, end-to-end velocity and rise-time velocity are determined using time-correlated measurements of single elongated polymers in two or more detection zones. At least an external electronic device is connected to the computer host through a plurality of connection ports disposed on the computer host. A method for making a heat pipe wick in accordance with the foregoing structures is also provided.