3 Review(s)

This timer circuit uses a 555 IC timer number. This small, compact and portable. For the snooze alarm by buzzer when some 5 to 30 minutes. It makes clear the brain is ready to continue to work. The circuit includes a circuit IC1 555 timer Mono Stable for the delay. The switches as election time. Work is that when switch will allow the current flowing through resistance will flow through the switch to capacitor. Acting with a delay charge and discharge completely. Then send a signal to Pin 7 and 6 of IC resulted beeps Buzzer out. The time value is determined by the value of resistance and capacitance