A method and apparatus for detecting and locating leaks in buried pipes is disclosed in which ground penetrating radar, induction, acoustic, and vacuum excavation systems are selected based on soil conditions and then employed in selected combinations. The circuit includes a first and second terminal electrically coupled to body tissue. The signal generator generates a periodic signal. Playback management information of each of the divided cells and current cell is re-created, and erasion level information is appended to playback management information of the divided cell that belongs to the appending range. Therefore, fabrication processes of the encapsulation substrate are simple, and fabrication costs are reduced.