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Minute Timer with alarm by IC555

2016-02-18 18:45  
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This circuit uses a 555 IC timer number.This small, compact and portable. For the snooze alarm when some 10 or 15 minutes.It makes clear the brain is ready to continue to work.
When the switch S1 to enter a power supply circuit, it will be ready to go.The circuit includes a circuit IC1 Mono Stable for the delay.The switches S3-S6 as election time.If selected by S3, 5 minute timer.S4 is located at 10 minutes.S5 timer for 15 minutes and S6 is scheduled for 30 minutes.If you want to set for 10 minutes, switch S4 is followed by a switch S2 to start all the time.Work is that when switch S4 will allow the current flowing through R4 will flow through the switch S4 to C2.Acting with a delay charge and discharge completely.Then send a signal to Pin 7 and 6 of IC1 resulted BZ1 beeps Buzzer out.
The time value is determined by the value R2, R3, R4, R5 and C2.If you want to set up a long time, it increases the R and C, but would spend less if it reduced the R and C.

Minute Timer with alarm by IC555

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