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This work presents the design of an electrical stimulator based on modulated pulses. A reduction of the electrical impedance of the skin is pursued in order to facilitate the nerve stimulation with lower intensities of current and for reducing burning and painful effects as well. The stimulator is controlled by a PC through a graphic interface under the LabVIEW platform. Two outputs are available: a) monophasic rectangular pulses with programmable facilities in amplitude, frequency, and pulse width, which are used as the envelope; b) monophasic rectangular pulses with amplitude modulation and pulse width, amplitude and frequency of the carrier, all three adjustable.