An essential understanding of basic electronic concepts. The topics concern (i) diodes and diode circuits such as rectifi ers, (ii) basic transistor principles such as biasing, operating point, load line, small signal analysis and (iii) amplifi er's quadrupole presentation bringing into play the input and output impedances, the transfer function and their interaction. Coupling theoretical concepts and investigation with exercises and online lab sessions, the course structure follows the old and very true adage: «I hear and I forget, I see and I remember, I do and I understand.» Well thought and perfectly clear, with rising diffi culty levels, a must-have for every physics student.