Patent ID: 8103021

Claim:
An audio reproducing apparatus comprising: a power supply for supplying a voltage; an amplifier for receiving the voltage and audio signals, amplifying the audio signals, and outputting amplified audio signals; a speaker for reproducing sound after receiving the amplified audio signals; and a controller for receiving the voltage and generating a control signal to enable the amplifier, the controller comprising: a generator for receiving the voltage and generating the control signal; and a delay unit for delaying the time of transferring the voltage from the power supply to the generator, the delay unit comprising a first capacitor connected between ground and an interconnection of the power supply and the generator; wherein the delay unit further comprises a first diode, a second diode, a second capacitor, and a first resistor; the first diode is forward biased between the power supply and the generator; the second diode is reversed biased between the power supply and the generator; the second capacitor is connected between the anode of the second diode and ground, and the first resistor is connected in parallel to the second diode; and the generator comprises a first bipolar junction transistor, with its base connected to the second capacitor via a second resistor, its collector connected to the cathode of the first diode, its emitter connected to ground via a third resistor.