Skin Effect

[okantex]

full schematic,
works with 4*1.5V battery ,it is placed near switch.
in my opinion,
wire end 1,2 are transmitter
3 - battery
4 + battery
5,6 are buzzer (according to pcb)
7,8 reciever
9 ?

if you can make connection, please do changes in paint and post here.

[okantex]

sorry

[okantex]

for transistors
on board they are named as UT1 ,UT2....
I thougth them as UJT but according to a friend they are ordinary pnp and npn transistor.

[okantex]

I tried to upload drawing of transistors but can.
but found a mail from our friend KT315.I asked it to him a year ago.here is his answer,
oa> in pcb, first two transistors called as UJT .third
oa> looks like pnp .but I can not name them.can you tell
oa> me their releavents(equalents).

seems silicon like KT315 and KT361.
KT315 - npn type
KT361 - pnp type

oa> forth picture is a little circuit where third
oa> transistor is used.something interesting.two diots are
oa> used paralel but in different ways.
oa> Thanks

MP16A - germanium pnp type.
all these transistirs are very oldy. use any one - 2N2222, 2N3904,
2N3906,
BC546-548 etc

[Qiaozhi]

OK - I've examined your PCB layout, and unfortunately failed to make any sense of it's construction. The only part that (possibly) can be identified is a multivibrator formed by U6 and U7. Even then I'm not 100% certain about this. These two transistors appear to be cross-coupled by C9 and C10. If that is the case, then wires 7 and 9 are not the receiver connections. I suspect these may be connected to the group off-board selectable resistors, and most likely allow the frequency to be adjusted. However, U6 is oddly connected to U5, and the rest of the design doesn't make a lot of sense.

There are also a number of other problems:
1. There is no connection shown to U4 (emitter?).
2. There are two C13s in the circuit.
3. Wires 8 and 9 are shorted together??
4. Wires 4 and 5 are also shorted together??

There are so few components in this design, that I find it difficult to believe it has any significant performance.

It is certainly not clear (at least from the information you have provided) whether this is a BFO, IB, PI, or something else. It still looks like it could be a homemade LRL to me.

[okantex]

Hi
be sure it not a LRL.According to father' friend ,itwas made for a mining company who works in asia.he owned the second prototype.because the designer was his chief where he works.almost 30 years ago.designer was the founder of grunding tv plant in turkey.a japan engineer.now we can not find him.
when it was stolen ,the thief took it to several tv repairers.and they had unsolder most of connections.only buzzer is still on board now.
so you can replace any connection according to your decisions.
there is one selectable resistor unit varies between 0.82k-48k.and onather part that must be a selector but nothing around looks like a resistor now.but on control box you can see selection numbers(six stage)( p,1,12,16,24,32,)which is near zero button in drawing.
About problems,
1. sorry I had forgotten.I placed it now.
2. they are resistors.but u are right.one of them is r10
3. all wires you see are mentioned toshow wire holes on board.
I did not understand term shorted.do you mean shortcut. if so ,NO.
8 and9 use same entrance or out put as source in my opinion.
4. 4 is entrance of (+) battary.
5 is (+) leg of buzzer.is there a oroblem.buzzer is not unsoldered.it is still on board.

yes there is a lost circuit unit which was placed in coil section( coil head).but it was a transmitter unit to sent signal to phaser unit which u can see in previous mails.
in coil head there is a square ferrit core unit which was used in TVs as HV transformers.I thing it was increasing voltage which makes this tool sensitive.according to dept measurement values on phaser this tool detects up to 10 meters.it was designed to find ore bodies ,so that thinks everthing at coin size.but there is a part at left corner to understand the target underground is a mineral or ore vein.which lokks like three potansiometers in series.

[Unregistered]

and there is something else about transistor positions on pic.
I do not know electronic much and also pcb progrm that I placed them according to what I see on board.you could need to turn all transistor 180 degree.keep this in mind.
thanks

[Qiaozhi]

and there is something else about transistor positions on pic.
I do not know electronic much and also pcb progrm that I placed them according to what I see on board.you could need to turn all transistor 180 degree.keep this in mind.
thanks

Oh dear. That's makes it even more difficult to understand. :confused:
Since some of the unit is actually completely missing, you may have an impossible task on your hands. Is there any chance you could post some photographs of the device, and a close-up of both sides of the PCB? A photo of the search head would also be good.

Given the simplicity of this design and the fact that you say it's not an LRL, then it is most likely a BFO. Since the transmitter was part of the search head, I can only assume the beat oscillator was also on the same circuit board, as there is no evidence for this on the PCB above.

[okantex]

Hi,
nowadays I do not a posibility to take photo of circuit.
but the circuit I draw is right.for transistors ,I placed them as the writing on back of them is showed by thick side of transistors in pics.
I draw head's coils .
1. is wound on iron core. 2r =2.5-3cm ,L=3 cm inner side is empty like iron made sweeper sticks.
2.is wound on wooden core.I just show wire
3.is on a couple of u core
http://www.en.aet.com.pl/FERRITECORE...4/Default.aspx
cores are positioned like in pic.
not sure ,when I got this unit the search head was scattered (break into pieces). there was jusrt u cores and 2. coil made as copy of original.
and there was a wire (like cell phone charger's wire which is between transformer and phone connection pin) wound around cores with 3 turns like 4. in drawings.
I learned all from the owner.
he said in head ,there was crystal and really small four selenoid windins .
four of them were positioned like a circle and perpendecular to 1. and 2.

[okantex]

drawing,
by the way what does circiuitry looks for.just reciever.

[Unregistered]

and there was a 9 volt battery in search head

[Qiaozhi]

and there was a 9 volt battery in search head

The presence of a 9V battery in the search head is very strange. Particularly since you would expect this to interfere with the operation of the detector.
Having examined the coil configuration I can safely say that this looks like nothing I have ever seen before.
Nor can I understand how this configuration would allow detection at a 10m range. :confused:

[Unregistered]

Hi
in projects there is a PLL kamil karus project.detects metal from 75cm with 5cm coil.which looks like my second coil.and my 1. coils core cause an enlargement in second's fluxes.
and remember in zahori test results,higher the voltage in line greater the distance.forrefregerator 4-6 mmeter (works 220 V) for high voltage line 80 meter.
if we increase voltage by using u cores we could achive more dept.
I read BFO Theory pdf file again aand again in info about metal detectors part.
thre say we have to decrease L .if we connect coil 1 and 2 in parallel,because of low L in first coil we will reduce inductance.and also reduce resistance because of paralel connection.which means increase in current which pass through coils.this also means increse in drain problem .so we have to separrate transmitter with its battery for not to effecet receiever.so 9V could be for transmitter.

[Qiaozhi]

Hi
in projects there is a PLL kamil karus project.detects metal from 75cm with 5cm coil.which looks like my second coil.and my 1. coils core cause an enlargement in second's fluxes.
and remember in zahori test results,higher the voltage in line greater the distance.forrefregerator 4-6 mmeter (works 220 V) for high voltage line 80 meter.
if we increase voltage by using u cores we could achive more dept.
I read BFO Theory pdf file again aand again in info about metal detectors part.
thre say we have to decrease L .if we connect coil 1 and 2 in parallel,because of low L in first coil we will reduce inductance.and also reduce resistance because of paralel connection.which means increase in current which pass through coils.this also means increse in drain problem .so we have to separrate transmitter with its battery for not to effecet receiever.so 9V could be for transmitter.

The Kamil Klaus circuit is not as sensitive as the article claims. I built this circuit some time ago, and the sensitivity is very poor. This should probably be 75mm, not 75cm. (i.e 3" range with a 2" coil, which sounds more believeable.)
Also, the Zahori is not a metal detector. It is an electronic version of a dowsing rod. The name zahori means "dowser".

[Unregistered]

I know zahori.ofcourse it is not metal detector.I wanted to mean effect of high voltage line.when voltage increases effect also increases.