TTL series chips are a classic IC series from the earlier days of digital electronics that pre-date the mass adoption of microprocessors. It can be fascinating to explore these early digital logic chips and this TTL Clock kit has a great range of TTL devices to learn about.
With binary counters, 7 segment decoders, quad input NAND gates and more, there’s a heap of TTL series IC’s to delve into. The kit is all through hole mount and therefore is suitable for hand soldering, perhaps not for an absolute beginner, but certainly for someone with a couple of hours of soldering already under their belt.
Weird Electronics sell this kit in a variety of options, you can get the complete kit with the LED display in either red or green or there is a PCB and trimpot only package if you have heaps of TTL at home. Finally a fully assembled and tested version is available should you not want to solder your own.