Abstract: A preferred frequency is identified, being usable to stimulate a neurological target within a mammalian body using at least one microelectrode positioned at or near the target. To establish efficient and effective stimulation, an impedance analyzer is provided for measuring electrical impedance values indicative of a microelectrode-tissue interface across a range of different frequencies. A preferred one of the measured electrical impedance values is identified as being closest to a pure resistance. The neurological target can then be stimulated at or near the frequency associated with the preferred impedance value (peak resistance frequency), thereby promoting desirable traits, such as optimum charge transfer, minimum signal distortion, increased stimulation efficiency, and prevention of microelectrode corrosion. The peak resistance frequency can be used to determine an preferred pulse shape.

Abstract: An electronic device with a circuit for supplying electric power, with a variable capacitor, by alternating mechanical movement. The supply includes, in the form of passive components and without synchronizing structure: generating branch including in series the variable capacitor and a biasing capacitor, connected in parallel to a rectifier circuit and a storage branch, between: a base node, on the variable capacitor side; an output node, on the biasing capacitor side; unidirectional charge return branch: to the generating branch, via a biasing node between the variable capacitor and the biasing capacitor; from the rectifier, receiving a part of the electrical energy produced. A circuit includes a voltage multiplier connected to the biasing node for applying a voltage that is multiplied relative to that existing between the output node; and the base node or one of the ends of the storage branch.