configurations provide reduction in the hum and the weak shocks that are produced in audio equipments where electrical power is supplied . switching electrical power sources include , a rectification element that rectifies a current that is supplied , a switching element that switches the input voltage that has been rectified by the rectification element , an oscillator circuit that oscillates at a specified frequency and drives the switching element by means of oscillation , and a transformer with which the voltage that has been switched by the switching element is input to the primary oil and wherein an electrical power source output is obtained from a secondary coil . a plurality of capacitors are connected to the conductors .