A DC-DC Buck circuit has a DC input terminal, a DC output terminal, a ground terminal, an inductor, a capacitor, a sampling resistor, a PWM control chip and a DrMOS chip. In other aspects of the invention, there is provided a new and improved animal garment with an elastic or adjustable collar, an elastic or adjustable belly flap, an elastic or adjustable lumbar band, and means for securing the garment to the wearer. Thereby, a stray capacitor can be stably formed using the insulating material of the flexible cable, and a high-frequency noise can be effectively reduced. The beam body and runout portions are defined by projection of a variable I-shaped cross-section in the first direction along at least a portion of an entire combined length of the beam body and runout portions. The proximal end of the shaft and the terminus are simultaneously rotatable to cover the proximal end of the shaft to the portions of the first handle and to couple the terminus to the portions of the second handle. In another embodiment, the EM signal is down-converted to a baseband information signal.