A project laboratory experiment on digital electronics for second-year undergraduates at the Katholieke Universiteit Leuven, Campus Kortrijk, is described. The project deals with DTL electronics, logic operations and arithmetic operations. It follows an elementary course in digital electronics and starts after some exercises concerning the working and characteristics of diodes and transistors and some circuitry with these components (totalling 8 h). The project itself lasts 12 h and is carried out on a self-made electronic testboard at low cost; the do-it-yourself price is about 25000 BF ( Pounds 350).