Noise Making AC Current Sensor





Introduction: Noise Making AC Current Sensor

About: Hello, I am 17 year old innovator living in India. My interest lies in Electronics. Surf through my creations and enjoy!!!!1

Here is the simple AC Current Sensor. It is useful for checking the power in mains wiring especially the broken points in concealed wiring. Whenever the probe gets close to AC Mains the LED Glows and buzzer beeps. It can detect the line from a distance of upto 31 cm.

Step 1: Gather Materials

1. LED

2. Buzzer

3. BC558

4. 100 ohm resistor

5. 22uF Capacitor

6. BC549 Transistor

7. 10k Resistor

8. 12k Resistor


10. 100k Resistor

11. Telescopic Antenna

Step 2: Create the Circuit

The circuit uses an n-channel FET BFW11 for detecting the mains voltage.

Assemble the circuit on a general purpose circuit board and use a miniature DC Buzzer with internal oscillator and transparent LED.

Step 3: Antenna

Use 10cm steel rod or a telescopic antenna as the probe.

Now, you are done with your noise making AC Current Sensor.



    • Casting Contest

      Casting Contest
    • Woodworking Contest

      Woodworking Contest
    • Clocks Contest

      Clocks Contest

    We have a be nice policy.
    Please be positive and constructive.




    Nice project. Could have used a circuit board and finished product. But it can be build to a lot for different designs and configurations. And even SMD parts would make it really small. With that all stated, I would not totally rely on this to assure there was no power on any line. I would back it up with a quality volt meter myself for a second opinion. JMHO

    1 reply

    Thanks for the compliment and suggestion.