US Speaker

摘要

The present invention relates to a USB speaker capable of reproducing output of an analog source without using a USB cable by using a DC power source for adjusting the volume of a speaker as a driving power supply (VCC) of a USB block. The speaker includes a first regulator for maintaining a power supply including digital data input to a digital input port at a predetermined level, a second regulator for outputting an analog signal input from the digital data included in the power supplied from the first regulator or the analog input port, And an analog power supply terminal (V _A ) of the USB block via a plurality of capacitors and resistors, and a digital controller power supply terminal (V _D) applied to the second regulator, and, by the DC power input from the DC input port to USB block It consists of the volume amplifier to adjust the output level of the output signal from easy to use.