a method and device for supplying power for an anc earphone by utilization of a power source of an electronic equipment . according to the power supplying method , power is supplied to a noise canceling circuit of the anc earphone and its related circuits by the power source of the electronic equipment through a microphone contact , a left channel audio contact , or a right channel audio contact of an earphone jack of the electrical equipment . the power supplying device includes the anc earphone and the electronic equipment . this invention enables the anc earphone to directly obtain power from the power source of the electronic equipment , so that the anc earphone is simple in structure , convenient to carry , suitable for mass production , low in production cost , and high in compatibility .