The maximum allowed current is determined at least partially on an instantaneous level of a load voltage.

Explanation of the most frequently used sound level measurements, e.g. instantaneous level, equivalent level, maximum and peak level, percentiles etc.

Explanation of the most frequently used sound level measurements, e.g. instantaneous level, equivalent level, maximum and peak level, percentiles etc.

Serial tuning capacitors are inserted along the conductor of the loop antenna as often as necessary to achieve a negligible instantaneous level of reactance on the antenna.

There may be provided a circuit (12) for monitoring and detecting the instantaneous level of a rectified waveform (2c), thus facilitating regulation of the drive current (2d) by the driver (14).