This is timer circuit uses a 555 IC timer. it small,compact,portable. For the snooze alarm by buzzer when some 5 to 30 minutes. It make easy with pcb layout
This is IC 4060 Timer circuit. When rises time that is set, Suppose set 5 minutes time. after all time to 5 minutes. the circuit will emit a sound of buzzer once. [...]
The digital clock circuit that electronic amateurs are most interested. And The clock ICs that most popular are LM8361, MM5387, [...]
The red and green LEDs will flash alternately and when time to setting the buzzer will loudly sound each time LED flashes.