How to Connect a Turntable Directly to a Computer USB Adapter
A turntable plays various size records. It outputs audio via RCA cables (the red and white audio cables). These cables carry an analogue signal that must be converted to a digital signal when recording to a computer. A USB adaptor connects to a USB port and acts like the computer's sound card.
Many USB adaptors can accept RCA inputs that the adaptor translates into a digital signal for use with the computer.
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Connect the red and white connectors on the RCA cable to the RCA jacks on the back of the turntable.
Connect the other end of the RCA cables into a RCA input on the USB adaptor.
Connect a USB cable from the USB adaptor to an open USB port on the computer.