LED clock with CMOS logic

This clock uses only CMOS logic IC’s. No programming needed. Wide power supply range 3-15 volts. 24 hour display. Hours and minutes can be set independently with buttons.

Circuit diagram. Note that with 470 ohm LED current limiting resistors suitable voltage is 5-6 volts.

Video https://youtu.be/sFB7KNyGU3Y