•  
  •  

Contactless Mains Voltage Indicator

This is a CMOS IC (CD4033) based circuit which can be used to detect presence of mains AC voltage without any electrical contact with the conductor carrying AC current/voltage. Thus it can be used to detect mains AC voltage without removing the insulation from the conductor. Just take it in the vicinity of the conductor and it would detect presence of AC voltage. If AC voltage is not present, the display would randomly show any digit (0 through 9) permanently. If mains supply is available in the conductor, the electric field would be induced into the sensing probe. Since IC used is CMOS type, its input impedance is extremely high and thus the induced voltage is sufficient to clock the counter IC. Thus display count advances rapidly from 0 to 9 and then repeats itself. This is the indication for presence of mains supply. Display stops advancing when the unit is taken away from the mains carrying conductor. For compactness, a 9-volt PP3 battery may be used for supply to the gadget

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like


Digital Ohmmeter LCD Audio Impedance Test Meter Speaker Voice Resistor System picture

Digital Ohmmeter LCD Audio Impedance Test Meter Speaker Voice Resistor System

$66.49



Klein Tools CL900 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) picture

Klein Tools CL900 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ)

$121.63



5x Panasonic FC 47uF 50v low ESR radial Capacitors caps 105C New low impedance picture

5x Panasonic FC 47uF 50v low ESR radial Capacitors caps 105C New low impedance

$1.69



5x Panasonic FM 22uF 50v radial Capacitors caps 105C 5mm 5x11 Low-ESR Impedance picture

5x Panasonic FM 22uF 50v radial Capacitors caps 105C 5mm 5x11 Low-ESR Impedance

$1.69



Farnel Wayne Kerr LSN0930A Line Impedance Stabilization Network (LISN) 9kHz-30MH picture

Farnel Wayne Kerr LSN0930A Line Impedance Stabilization Network (LISN) 9kHz-30MH

$500.00



5x Nichicon HE 1000uF 6.3V radial 105C capacitors 8mm caps Low-ESR Impedance picture

5x Nichicon HE 1000uF 6.3V radial 105C capacitors 8mm caps Low-ESR Impedance

$1.99



5pcs - 4.7uF 50v Panasonic FC low impedance radial 105C Capacitors low ESR caps picture

5pcs - 4.7uF 50v Panasonic FC low impedance radial 105C Capacitors low ESR caps

$1.49



10x Panasonic FC 10uF 50v Low-ESR Impedance 105C radial capacitors caps picture

10x Panasonic FC 10uF 50v Low-ESR Impedance 105C radial capacitors caps

$2.19



VINTAGE GENERAL RADIO COMPANY 1650A IMPEDANCE BRIDGE PORTABLE picture

VINTAGE GENERAL RADIO COMPANY 1650A IMPEDANCE BRIDGE PORTABLE

$149.99



Interacoustics AT235h Impedance Audiometer picture

Interacoustics AT235h Impedance Audiometer

$269.00