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This project completes a USB(Universal serial bus) audio card with Atmega162L-8PI. In most computers, the audio device belongs to PCI device. If you want to add a new PCI audio device into your PC, you have to open the computer case, find an idle PCI slot , and plug this card in, then install the driver for the device. This deed is complex and dangerous, because any wrong operation may destroy your motherboard. Now USB audio device has been used in computer system more and more. It is simpler and much more convenient than PCI device. With a USB B-type to A-type cable, my audio card can be easily connected with computer. After a few minutes, Windows system will tell you a new composite USB device is found, and then audio device driver is installed automatically. In the device manager, a USB Audio device appears. After you select the USB audio device as preferred audio device, windows system will transfer audio data to this card. After connecting earphone with this card, you can hear voice when you play a MP3 or WAV file.