a source of pulses for the electronic suppression of pain is represented by a multivibrator wherein the amplitude of the output signal is double the value of the feeding voltage . the principle of the invention resides in a multivibrator provided with two sets of complementary pairs of transistors , one set of which works simultaneously as a switch and a feeder of voltage doublers . the multivibrator is fed by this increased voltage so that at the output , pulses of double amplitude arise , i . e . an amplitude four times greater than the value of the feeding voltage .