https://www.electronicdesign.com/electronic-design/whitepaper/21803850/computer-sound-card-provides-simple-internet-based-appliance-remote-control-pdf-download
Computer Sound Card Provides Simple Internet-Based Appliance Remote Control (.PDF Download) |...
Using a standard PC-sound card and straightforward circuit, you can implement low-cost on/off control of home appliances via the Internet. The system (Fig. 1)...
computer sound cardinternet based