ELECTRICAL STIMULATOR

PURPOSE:To aim at effectively activating neural cells, and to obtain an electrical stimulator by which various kinds of conditions of patients can be improved, by providing a circuit in which an anode electrode and a cathode electrode alternately deliver electrical rectangular wave signal outputs. CONSTITUTION:When a first transistor Tr1 is turned on, photocouplers Ph1, Ph2 connected thereto are energized, an output from the photocoupler Ph1 being transmitted through a resistor R5 and a diode D1 to a transistor Tr3 which is therefore turned on, and an output from the photocoupler Ph2 being transmitted through a resistor 7 and a diode D3 to an npn type transistor Tr5 which is therefore turned on. As a result, the anode potential energizes the transistor Tr5 so as to pass from an output terminal 14a to an output terminal 14b and then to reach a cathode potential, and brings the output terminal 14a, 14b to be anodic and cathodic, respectively, so as to deliver a rectangular wave signal. When a second transistor Tr2 is turned on, it brings the output terminals 14a, 14b to be cathodic and anodic, respectively so as to deliver a rectangular wave signal. Accordingly, when the transistors Tr1, Tr2 are alternately turned on, the output terminals 14a, 14b becomes alternately anodic and cathodic thereby it is possible to deliver alternate rectangular wave signals.