![DIY non-contact high voltage detector](https://i.washerhouse.com/uploads/posts/2019-11/1572876521_1.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876503_2.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876498_3.jpg)
The detector is powered by two little finger elements.
![DIY non-contact high voltage detector](https://i.washerhouse.com/uploads/posts/2019-11/1572876482_4.jpg)
The body is a transparent plastic tube.
![DIY non-contact high voltage detector](https://i.washerhouse.com/uploads/posts/2019-11/1572876524_5.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876462_6.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876466_7.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876538_1.jpg)
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](https://i.washerhouse.com/uploads/posts/2019-11/1572876463_8.jpg)
Electric locomotive power lines 25 kV.
![DIY non-contact high voltage detector](https://i.washerhouse.com/uploads/posts/2019-11/1572876479_9.jpg)
The higher (and therefore more dangerous) the voltage, the sooner the detector is triggered when approaching an object, notifying you of a serious danger.