Athosworld
Member
I have a Belkin phone charger and I have noticed that every time I disconnect the phone, It makes a series of strange noises, a high pitched one, a low pitched one and then it continues making a high pitched sound. I know that the transformer is making these sounds but, why does it make that series of sounds? Is it detecting that the phone has been unplugged and then it readjusts the duty cycle of the transformer driver transistor?