There is disclosed herein a driver system for an ultrasonic probe for allowing a user to have proportional control of the power dissipated in the probe in accordance with the position of power dissipation controls operable by the user and for automatically tuning upon user request such that the driving...http://www.google.com/patents/US5001649?utm_source=gb-gplus-sharePatent US5001649 - Linear power control for ultrasonic probe with tuned reactance
