Abstract: The device is designed to be housed within the body of a control button. It comprises two coaxial ratchet wheels (7, 8) mounted in such a way as to present oppositely directed internal circular toothings; a contact strip (4, 5) is associated with each wheel. The contact strips are driven by the rotation of the button (1) by way of a mechanical axle (2, 10, 11) on which they are friction mounted. For one direction of rotation of the axle one of the strips slips on the teeth of the wheel with which it is associated, creating intermittent breaks in the strip-wheel electrical connection on crossing from one tooth to the next, while the other strip, which is locked by the toothing of the associated wheel and slips on the axle, remains in permanent electrical contact with the ratchet wheel with which it is associated. If the direction of rotation is reversed, the role of the strips is reversed.Application to the creation of pulses by intermittent breaking of a D.C.