Pinpointer vlf (mini metal detector)
It is an auxiliary miniature metal detector that is used for precision
the location of small metal objects in the ground. With it, too
we will determine the location of metal pipes in the wall or reinforcement bars in the ceiling,
which is important when drilling holes there.
Low-cost detectors and pinpointers as well as similar devices available for sale,
whose descriptions and diagrams can be easily found on the Internet, work on a principle
detuning of the LC circuit due to bringing the metal closer to L (coils - probes).
The short range and strong susceptibility to the influence of the ground (earth) is their main disadvantage.
The presented device works on a different principle. It has two coils of which
one is the transmitter and the other is the receiver. Their mutual arrangement is such that
that the influence of the transmitting coil on the receiving coil is minimal. Metal object,
near them will upset this balance, causing them to grow
amplitude and phase shift of the transmitter signal induced in the coil
receiver (very simplified).
This rule allows for much greater ranges as well
minimizing the impact of soil mineralization on the detector operation.
Unfortunately, it comes at a cost with the difficulty of making - especially the probe!
The schematic diagram of the device (attached) is very simple.
Basic features
- operating mode - static
- 10kHz frequency
- ranges - 1 grosze over 5cm, 5gr- 6cm, for large objects over 20cm
- does not react to stones containing iron compounds
- low power consumption (9V - approx. 7mA)
- a tiny plate (8.5cm x 1.7cm)
- sound signaling and LED diode (you can add vibrator)
- the shape of the probe allows you to bury in the ground
- low cost - made of readily available elements
Some details in the photos.
Supermodurator wrote 118 posts with
rating 250 , helped 2 times.
Been with us since 2005 year.
Comments
I like the project, I would do such a miracle myself. What frequency does it work at? I was very disappointed with the attachment. You only gave a schematic there that looks like a stripped down ALL1... [Read more]
could you give a picture of the probe? Or explain its construction? nice design, + for originality, because it's kind of simple, and hardly anyone does it :) [Read more]
Hello. The device is made aesthetically. Could a colleague demonstrate a movie with action? Please put the data about the probe, because in the link provided by I see that you presented the construction... [Read more]
I registered, 2 pages attached. [Read more]
The probe is the most difficult to do. Necessary for its construction (regulation) there is a frequency counter and an oscilloscope. During construction, most of the rules we use apply by performing... [Read more]
I dug up the ALL1 diagram, took a look and the fact - it seemed to me. I return my honor and sprinkle ashes on my head. My only excuse is that I probably made Alla three years ago, or earlier, and since... [Read more]
As far as I understood the scheme correctly, the system examines the amplitude and phase with Rx. As for the amplitude, the matter is obvious to me, but why is the phase also tested? [Read more]
Because thanks to this, the detector can distinguish colored metal from iron, you can also eliminate the influence of the soil. Anyway, you'd better read somewhere about system solutions and types... [Read more]
Someone asked for versions in SMD. Here is the finished project. I post with the consent of the creator of this device. http://obrazki.elektroda.net/36_1283615146_thumb.jpg [Read more]
How can I etch the plate on the basis of such a picture? After all, this is an overview drawing and not a PCB design. [Read more]
I'm sorry, but I did not write that it is etchable. This is made in SprintLayout 5.0. This is the free version of this program and has some limitations. This includes on the fact that I can print a... [Read more]
If you can print to paper, you can also print to PDF, it's very simple: use a free program called Bullzip PDF Printer. The description of the program explains all the confusions: Download from: ... [Read more]
I would like to ask for a list of all detector elements with exact parameters. [Read more]
Unfortunately, such a list has never been established - the layout has few elements, easy write them down from the schematic diagram. Miniature elements, 5mm raster. Both integrated circuits are SMD... [Read more]
I am asking for a list of these elements. so far I have been building only kits and I would like to make a pinpointer from scratch. I wrote down the basic elements from the drawing, but I cannot read some... [Read more]
There are some who have already performed this detector and such problems did not report .. Write specifically which markings raise your doubts? I adhere to it once again, as long as the device diagram... [Read more]
is it possible to insert a full PCB design in PDF [Read more]
Better late than never.. And one more pin pointer of mine http://www.youtube.com/watch?v=XCPxPdD5Y0o [Read more]