Disclosed is a circuit for preventing an output of a pop noise, which occurs from an audio amplifier when a power switch of an electronic device loading the amplifier is turned on/off. The circuit may comprises an analog switch for switching an electrical connection between an audio amplifier and a speaker, and a signal delay circuit capable of respectively delaying times that the operating states of the analog switch and the power supply are changed when the power switch is turned on/off, and it is structured such that the analog switch is already opened state at the time that the power supply is on/off. Accordingly, it is possible to prevent the pop noise from being outputted through a speaker connected to the amplifier. The circuit of the invention can be applied to a variety of electronic devices having an audio amplifier.