This non-contact ac voltage detector circuit, using digital IC CD4060 as main components and resistor and LED display only. it is use 9V battery as power supply.
Tools that features equivalent of a professional, easy to use, cheaper, and more importantly, safe for use. For checking to find AC 220 Volt or 120V or call that AC main power in various points have or not?
Most use a screwdriver to check the electricity. It is a lightweight, easy to carry. But the users lack of knowledge or caution in use. It can be a danger easily of electric shock. Because usage of a screwdriver. The small amounts of electricity to flow through the conductor and users as well. Which will see that very dangerous. If a short circuit or a any of people who work touches the parts of the conductor.
Note: new date below
The working principle of the project.
Detection of the mains power. Must based on the principle of electromagnetic fields that spread out from the wire when a current flows through a conductor. When an electric current flowing in the wires so will be magnetic field. We can detect the electromagnetic field that induced by incoming. Which we have to detected with device that has high sensitivity only. The CMOS type semiconductor device is a device suitable to be used in many applications. I choose to use CMOS CD4060 Ics order to clock signal and divides at the same time. Until output signal is displayed with LED.
The operation of the circuit
Tell principle at length. But see circuit real work in the picture below. May be shocked and do not believes that. This circuit will actually work. Thus we see that The principle of this circuit is how?
When we started to use a wire antenna is a length of 10 cm. Placed near the conductor insulation is the electromagnetic induction, Came into being a clock signal to pin 11 of IC1 number CD4060. This is a CMOS IC with the generator frequency circuit and the 14 stage binary frequency counter circuit
The electromagnetic field from the mains power, which has frequency of 50HZ, to IC1, it is frequently divided out to Q4, that divided by 16, Frequency is equal 3HZ, and LED1 flashes to indicate that around the mains power. If there is no mains voltage or current to flow, there is no electromagnetic field. The output of IC1 is not up frequently 3HZ so LED1 does not blink. But the bright light continuously or not at all.
The test project is also used to detect the magnetic field at various points, such as a monitor. The flashing of LED1 will flash faster. Because it intensity of the magnetic field and a higher frequency than with mains power.
Have now been easy and safe. Just to put the antenna close to the mains cable or plug socket that we want, if an electric current LED1 flashes, But if there is no power LED1 is lit or shut down, As mentioned above.
But do not bring antenna insert holes into of plug socket into the wall outlet a false sense . The downside of this project can not tell if the line is the Line or Neutral, but I think that’s it. And a small budget. It is worthwhile to make work it.
I add buzzer sound at output. as Figure circuit below and see video show using this project.
The buzzer sound circuit is astable mutivibrator with both transistors like we often use them.
All components please see in circuit it a few parts.
My son is testing the non contact AC detector voltage tester.
When near AC-line it will alarm with buzzer sound and LED flash as frequency of AC-line.
And can test area that high frequency or fluorescent lamp lamp.
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