DIY non-contact high voltage detector

DIY non-contact high voltage detector

With this simple three-transistor detector, you can easily determine whether a cable or installation contains life-threatening voltage. For example, you turned off the electricity in the apartment. And to make sure that all the wiring is de-energized, it is enough to bring a homemade detector to it and make sure that there is no threat to life. In general, this is definitely a necessary thing in the household, and not only in the household.

Life-threatening voltage detector, manufacturing


The device is made with three transistors, without a board for surface mounting.
DIY non-contact high voltage detector

Please note that the circuit uses transistors of different structures. There are no special requirements for them; almost any will do.
Used as signaling elements Light-emitting diode and buzzer. The role of the antenna is played by a piece of wire 5 cm long.
DIY non-contact high voltage detector

The detector is powered by two little finger elements.
DIY non-contact high voltage detector

The body is a transparent plastic tube.
DIY non-contact high voltage detector

After assembly, if all elements of the circuit are in working order, the detector starts working immediately and does not need adjustment.

Checking the detector


We bring it to a socket with alternating voltage 220V.
DIY non-contact high voltage detector

Light-emitting diode lights up clearly and the buzzer emits a characteristic signal.
Next we test at a voltage of 380 V.
DIY non-contact high voltage detector

The result is the same. Everything works without failures.
Next is an ASU with a voltage of 6.6 kV.
DIY non-contact high voltage detector

Touching something like this is dangerous, so the detector reacts from a distance.
High-voltage poles with a voltage of 13 kV.
DIY non-contact high voltage detector

Electric locomotive power lines 25 kV.
DIY non-contact high voltage detector

The higher (and therefore more dangerous) the voltage, the sooner the detector is triggered when approaching an object, notifying you of a serious danger.

Watch the video


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Comments (2)
  1. Sergey
    #1 Sergey Guests 28 March 2020 13:07
    3
    What a beauty... if only there was a schematic for it, a basic one... there would be no price at all))
  2. alexs
    #2 alexs Guests 29 June 2022 08:20
    0
    tried it on kt3102.3107 sensitivity is very low Light-emitting diode does not burn!