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Water Level Alarm Using 555 Timer Circuit Diagram: Circuit Diagram of Water Level Alarm using 555 Timer – ElectronicsHub.Org The circuit uses a 555 timer in astable mode with R1=220 ohms, R2= 150 ohms and C1=1 uF. As we know, the frequency of operation of the IC 555 in astable mode depends on the values of R1, R2 and C1. Oct 18, 2019 · There are many ways of making simple timer circuits using different ICs and discrete components; here we discuss one such circuit using the ubiquitous IC 555. The IC 555 is a pretty common electronic part among the electronic enthusiasts and is also very popular due to the involved simple configurations and low component count.