Monolithic Alarming Timer Circuit Diagram

Published:2011/8/9 17:57:00 Author:Vicky | Keyword: Monolithic, Alarming Timer | From:SeekIC

Monolithic Alarming Timer IC1 is a 14 decimals counter/frequency divider and oscillator, which can work in a relatively wider range of frequency. When S1 closes, R4 and C2 can generate positive pulse when are turned on, and reset the counter. Then it begins counting. When it comes to 14 decimals, the 3 pin represents high level, and T1 drives the piezoelectric buzzer to produce sound. The time delay function can be adjusted by P1. Then relationship between time delay and parameters of components is shown as follows: 1 ~ 30 min: C1= 200mF; P1= 500KΩ； 1 ~ 60 min: C1= 470mF; P1= 500KΩ； 1 ~ 200 min: C1= 470mF; P1= 1MΩ.



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