An improved reference voltage generation is described. An extraction liquid containing the natural food-compatible resins is used in the method. The top portion contains studs aligning with the rivet heads to assist the release of the rivet head from the rivet strip, seating the rivets in pilot holes of the lower portion of the guide block assembly for further driving through the belt fastener and into the belt material. A transistor is diodelike forward connected between the first terminal and the ground. Each of the switchable integrators is switchable between a narrow bandwidth mode that provides for stable operation of the signal control system, and a wide bandwidth mode that enables fast signal transitions at the signal output.