Digital Circuits - These circuits are based on CD40xx Chips and other. You can use 74HCT or any other series that is available. use one family for a particular project. These were used nearly two decades ago. Use it for learning, glue logic or to interface your uC designs to external devices.
Do not make only Logic based designs like some below. It would be better to use a uC, CPLD or FPGA if you are building a complex gadget Basic Digital Circuits
- Basic Digital Circuits
- Digital Timers, Counters and Clocks
- Mixed and Interface Circuits
- 555 Timer based Circuits
More such designs as entire products