Coordinated metal and ceramic orthodontic bracket systems allow a practitioner to insert one or more ceramic brackets into a metal bracket system, replacing selected metal brackets with ceramic brackets, and vice-versa. The system comprises at least one scan input component and at least one scan clock component. Other embodiments allow data to be detected and processed in order to characterize a location and objects contained therein. The second phase-shift circuit is capable of adjusting the phase and gain of the feedback circuit.