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Hidden Wiring Finder


There was a need to determine the presence of electrical wiring under the plaster. We are looking for a solution to the problem.
The following scheme was found in the archives:

The magazine "Radio" No. 11 for 1988. The author of the article is D. Bolotnik from the city of Salavat of the Bashkir Autonomous Soviet Socialist Republic.

We will use radio components that we extract from donors.


Instead of galvanic cells, we will use the battery from a dead DVR.
We supplement the circuit with a board for charging via micro USB.


The case can be used from anything, with us it will be from a case from a broken medical thermometer.

All installation will be made on fiberglass and AliExpress. It can also be done by surface mounting, it can also be done on a printed circuit board, as in the original.

We will need:
Soldering iron with accessories.

Multimeter.
Screwdriver.
Knife.
Glue.
Details:
Transistor KP103ZH. (can be replaced with any imported equivalent)
Transistor KT3102. (we use instead of KT315, any n-p-n will do)
Transistor A733P. (use instead of КТ203, any p-n-p will do)
51 kΩ resistors and 15 kOhm. (we used 33 and 11 kOhm)
LEDs from an old (killed by a thunderstorm) router.
The button is from him.
Charger socket from the DVR.
Mounting wire.

Cut a window for the charging socket.
We also cut and install the charging board to the nylon insert from our case.

We make installation according to the scheme.

We insert the boards in the case, glue it.

Tests


A small antenna was added to increase sensitivity.

The accuracy of determination is from 1 to 5 cm. Which, in principle, is enough to not break through, accidentally wiring when drilling holes.
8.7
8.6
8.4

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11 comments
Thus, you can only approximately determine where the wire passes, which was generally important, since the economy should have been economical and the wires could, and more often did, lay diagonally from the wiring to the outlet. And the receiver can be used by anyone, it receives interference from an electric shaver, where the interference signal is stronger there and the wire.
Author
I read this method in Soviet magazines: Plug in an electric shaver and use a transistor receiver with a magnetic antenna to search for hidden wiring.But in this case, the integrity of the electrical wires is necessary. I have not tried it myself, but the idea is interesting. Now, not everyone has a transistor receiver SV-DV. xaxa
A magnetic head is useless if there is no load on the wire, and therefore no magnetic field, only an electric one to which it does not respond. This is the essence of the search. According to this principle, route finders for signalmen and gas workers are arranged. There, a signal is received on the wire, received by the search coil.
Author
I agree. In amplifiers we soldered the earth to them for the screen
Guest Valery
The head in these search engines is useless. Checked in due time.
Author
I collected according to this scheme in the ninetieth year. Then field workers were in short supply. Did compound. The case from the microphone was. Using a generator, breaks in the wiring harness of Kamaz were determined.
I did this when my son went to kindergarten, to repair the garlands for the New Year. Then he successfully lost. A year later he did it again. Then he decided to simplify. They can still find fresh wiring, but in the old house they can show on the entire wall. I was planning to do it on the head from a tape recorder, but so far my hands have not reached, and I rarely need such a device.
Author
I absolutely agree with you, your option is easier for a one-time option. And this device was assembled for frequent use. Put in a chest with a tool. It’s not very convenient to bother with the tester every time, I lost once two hours and that's it!
Author
The charge board was in the DVR. You can collect your own. Can buy. http://www.kit-shop.org/_pu/0/00169098.png
In general, a pointer tester and any low-power field worker are enough. We put the tester on ohms, the drain and the source to the probes, the shutter is an antenna.
What kind of charging card?

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