An old school digital clock made using transistor-transistor logic chips: counters, logic gates, flip-flops and other integrated circuits.

Switch-selectable digital frequency divider improved and integrated from Tsinghua University's Basic Experiments for Electronic Circuits and Systems course.

Discrete 74HC logic Manchester decoder with JLC EDA Pro and Altium source exports.

Contains the detailed description about 16bit hardware ALU developed using 74HC (XOR,AND,OR,MUX) ICs only.