Proximity switch with minimum current consumption

摘要

To achieve a proximity switch with minimum current consumption and at the same time little circuit and component expenditure, it is provided in accordance with the invention that an electrical resonant circuit (3, 4), the coil (3) of which can be influenced by the proximity, is excited into oscillation by a direct-current pulse, that the degree of proximity is inferred from the decaying process of the damped oscillation thus generated and that the excitation of the resonant circuit is effected periodically by a pulse sequence. <IMAGE>