If the device 3.5mm (output) is capable of sending S/PDIF and the 3.5mm-USB ‘C’ adapter is for digital audio, then yes it will. (but also note: the DDHIFI TC100 converter needs to get its power through the USC-C connection)

1- The simplest way using a PC/Mac computer as Host (the player); connect the DDHIFI TC100 converter to a USB-C (or USB-A using adapter to ‘C’) port of the computer (that has 5v power).
2- Then when the computer assigns the DDHIFI TC100 as a DA connection, set ‘Speaker Output’ to DDHIFI TC100.
3- Then just connect a good RCA cable between the DDHIFI TC100 S/PDIF (RCA) and the S/PDIF Input of your DAC (and DAC Out to amp Input).

*I have one and the DDHIFI TC100 is clean and will faithfully pass the signal to your DAC. It acts only as a USB – S/PDIF to RCA- S/PDIF converter with the correct termination.
Cheers – Mitch, audio engineer

I would like to know if this device can play the sound from a PC, through a 3.5mm Jack – USB-C cable,

(USB-C to be connected to this converter, DDHIFI TC100)

to a vintage DAC (1983) which has only RCA connection.

Thank you!