The most readily available S-Video connector is the 4 pin mini-DIN connectorI. It has an impedance of 75 ohms. 7-pin mini-DIN connectors are used on laptops and video cards. 4-pin mini-DIN connectors can be used with 7-pin sockets, but not the other way around. Video cards use the 9-pin DIN connector with Video In/Video Out functionality.