Basic converter element (10) for an ultrasonic converter (100) from a variety of basic converter elements (10),where the base converter element (10) is a oscillating element (12),which is stimulated by a driver signal to oscillate and, conversely, produces a receiver signal when oscillating, and which has at least one connection to the driver signal and to the output of the receiver signal, thereby indicating: that the base converter element (10) also has a contact (18) for switching to at least one other base converter element (10) and that the base converter element (10) is at least temporarily an isolated component.
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