Abstract: A position indicator has a first electrode, an inverting amplifier and electrical isolation circuitry. The first electrode, in operation, receives an input signal from a capacitive touch panel and transmits a reference signal. The inverting amplifier has an input coupled to the first electrode, and, in operation, inverts and amplifies the input signal. The electrical isolation circuitry has an input coupled to an output of the inverting amplifier, and, in operation, generates the reference signal based on the inverted and amplified input signal.

Abstract: The present invention discloses water leakage detecting system for liquid pipe and method thereof. The present invention provides the present status for all liquid pipes by installing more than one liquid pipes, by laying under the ground, to which more than one conducting wires are inserted or fixed, transmitting pulse signal to each conducting wire using pulse transmitter, checking whether each liquid pipe is damaged or not and grasp the damaged points by inspecting the received signal.