Digital clock with alarm
1983-1984, home and electronics section
result: hope it still works at my teacher’s home
tools: oscilloscope & solder iron
It was my first developed schematic. About 35 logic CMOS DIPs. Clock had 4 digits each of 27 red LEDs – ready military indicators with 4-bits logic input. It has external PS, backup battery and 5 minutes grid of alarm time.