A park brake includes a brake lever that is movable about a pivot. Electrode layers 15a-22a, 25a, 41, 42, 43 which compose the electrode patterns of the baluns 2a, 2b and the filters 3a, 3b, and the dielectric layers 30-39 are integrally stacked. The attached keyboard shares a common USB bus bandwidth with the internal embedded smart card reader through a host-scheduled, token-based communication protocol that is handled by the USB driver and the device driver. Based on a match between a broadcasted identifier and the identifier of the wireless device, the wireless device transmits a control message which informs the wireless network of the presence of the wireless device. A height and force adjustable mounting system is also disclosed for use with a planter that enables the force of such an implement on the soil to be modulated as desired. The reference voltage is an input voltage of the amplifier or the divided voltage of the intermediate point of the feedback resistor.