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Live Line Detector-Indicator(CD4017)

2017-08-10 17:35  
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This article describes the Live Line Detector-Indicator (CD4017). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: CD4017.

Detects the presence of a live mains conductor, Minimum parts counting

If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes theLEDto flash 5 times per second, because the 4017 IC divides the mains 50Hz frequency by 10. When remote from a live line, the unit stops counting, theLEDresulting permanently off.

Circuit diagram:

Figure:1 Live-Line Detector Circuit Diagram

Figure 1 Live-Line Detector Circuit Diagram

Parts

P1 =SPSTPushbutton
D1 = RedLED(any type)
C1 = 100nF 63V Polyester or Ceramic Capacitor
B1 = 3V Battery (two 1.5V AA orAAAcells in series etc.)
IC1 = 4017 Decade counter with 10 decoded outputs IC
Sensing probe 3 to 15 cm. long, stiff insulated piece of wire

Notes

Sensitivity can be varied using a more or less long sensing probe.Due to 3V operation, theLED’s current limiting resistor can be omitted.

 

 

 


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