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 Home » Tests and Measurement » Simple water detector circuit
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Simple water detector circuit    
This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes.   It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for example an aqueous solution, then because of the rectification action of D1 and D2, the C4 capacitor is charging.


Water detector components
R1 = 470K
R2 = 10M … 22M
C1 … C4 = 2.2nF
N1, N2 = 1/2 4093
D1 … D3 = 1N4148
T1 = pnp transistor (BC557)

4093 datasheet

Category: Tests and Measurement | Views: 747 |
 
 
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