There are two kinds of clock input for turntable, one is clock pulse, and the other is sine wave clock signal. You have to decide which clock signals the turntable and decoder belong to first. Both are the same, and the frequency of use is equal. Just use a clock line to connect the turntable clock output to the decoder clock input.

Cd player connection sequence: 1, pure turntable: cd player-(coaxial line)-decoder-(audio line)-power amplifier-earphone. 2. cd player with decoder: cd player-power amplifier-earphone computer connection sequence: 1, pc- digital decoder-power amplifier-earphone 2, PC- decoder (with usb input decoding)-power amplifier-earphone cd player and PC are responsible for extracting sound source. The decoder is responsible for decoding digital signals and converting them into analog signals. Headphone amplifier is responsible for amplifying and polishing analog signals. Convert it into electric energy that can drive the earphone better to drive the earphone to work.