This circuit allows you to use the parallel PC interface to control LEDs. The circuit was found in French documentation from the 90s and can serve as a basis for a control interface if the LEDs are replaced by relay drivers, for example.

This circuit allows you to use the parallel PC interface to control LEDs. The circuit was found in French documentation from the 90s and can serve as a basis for a control interface if the LEDs are replaced by relay drivers, for example.