2 boxxxx :)

[Unregistered]

hola, hermanos, soy un mexicano buscatesoros

hola hermanos buscadores, yo estoy muy contento de estar en este foro, yo tengo 50 años y soy buscador nato, y eso me viene de mi abuelita qpd , yo estoy tambien muy contento de reunirme con personas que tienen las mismas aficiones, y eso quiere decir que de alguna manera somos muy hermanos, mi aficion no es por ambicion, sino que me gusta lo misterioso y lo desconocido , yo he construido como 6 detectores de metales, en estos tres años que empece a fabricarlos , yo no estudie electronica , lo que aprendi fue leyendo aqui y alla, yo quiero felicitar al administrador de este foro por su excelente grupo y le doy las gracias por aceptarme, yo saludo a mis hermanos prospectores y les doy un abrazo de hermanos
espero mandarles fotos de mis trabajos y seguir platicando con ustedes

hello, i am jose one prospector whit 50 years old,mexican, i speak i little englisk only,i read one 90 porcent of your writing , it is very nice and sincerity, your post of articles, and i am very happy of your camaradery and company, you group is excelent my congratulations for the administrador, i thanks for yours for my registrer and you permisse to read to messages of yours
i like you panels , is very marvelous

jejeejj i speak very little english, excuseme
y send to yours in oportunity photos of detectors what i build i not study electronics i buil two bfo, others ibalance and one two box of my invention or acopladish modifications, thanks to yours brothers
prospectors
till tomorrows
detectoman joe

[VICTOR]

Bem vindo conpanheiro, este forum é um espectaculo...

[Geo]

Hi Ivconic

There are two pictures, one is IB/T/R or VLF and the other is a TX part of
Two Box we are speaking here about. Any simillarities !!??
The schemmatics are the same.

Can we just use the first schematic and add two separate
coils and make Two Box? Can we use any other good IB and
use it as Two Box? Why not?
We can do it.But we must choose a better schematic.
Buccaneer is a sens ib detector that we can work as two box.

Can I use OA90 or simillar diodes.Germanium diodes do the
better job here.Demodulated signal is weak and decay after
a second or two...Thats why I asked
I agree. Germanium diodes are more sensitive.I always use germanium diodes for demodulation

.Other...I choose LM358,
'cose I saw it in Classic 3 do the job.Instead od 7812 I used
7810 cose of batteries of 12v.
If i remember well LM317 is better because it needs only 1.25V between input and output.

Regards

[ivconic]

Thanks

Thanks Geo!

As i presumed.
I do have a TM808 schematic,also rx part of Gemini II. I would like to build
a 2 box like that.I do not have pcb draw for those. I found pcb for TM808 but
in SMD. I would like to have an conventional elements pcb size.Any hint or help?
I am lazy to draw myself such complicated pcb.It can include a "milion" of
mistakes too.....
regards

[Geo]

Thanks Geo!

As i presumed.
I do have a TM808 schematic,also rx part of Gemini II. I would like to build
a 2 box like that.I do not have pcb draw for those. I found pcb for TM808 but
in SMD. I would like to have an conventional elements pcb size.Any hint or help?
I am lazy to draw myself such complicated pcb.It can include a "milion" of
mistakes too.....
regards

Hi Ivconic.
The pcb of "Buccaneer" is very easy for drawing. As i see with careful you can build the Buccaneer at a general purpose pcb. The sensitivity of Buccaneer is similar to Gemmini III or to TM808.
A friend constructed it before years. It was a good and simple detector. Try it.
You can find the schematic of Buccaneer (by Andy Flind) at Carl's site (IB projects).
Regards.

[detectoman]

one question to yours

i am building one new detector, and in the complements or cap of diagram, the values are for example: 0.1 uf 16 v, vcd
these cap are polarized? or they are condenser? whitout polarization
i can install , cap, of poliprophilene? or only of electrilitics?
thanks for you attention

detectoman

UOTE=Geo]Hi Ivconic.
The pcb of "Buccaneer" is very easy for drawing. As i see with careful you can build the Buccaneer at a general purpose pcb. The sensitivity of Buccaneer is similar to Gemmini III or to TM808.
A friend constructed it before years. It was a good and simple detector. Try it.
You can find the schematic of Buccaneer (by Andy Flind) at Carl's site (IB projects).
Regards.[/QUOTE]

[detectoman]

excusme
i say 0.1 16 v vcd
i entendded these condenser are old, i descotinued, tubulars horizontal, whit conections, in extremes

[goldfinder]

Help - Lets get a "good" 2-box schematic

Help,
I am confuzed!

We must have at least a 1/2 dozen 2-box schematics and suggestions on this thread. Several have said they added more "stages" but no associated schematic. There are bits and pieces, references to ancient 2-box schematics, lots of speculation. I can do speculation very well but the proof is in the final product which is many times far between.

Please, would someone post or point me to a complete schematic. I tried building a 2-box from some of old schematics several years ago and it was a bust. I don't pretend to be a good electronic technician but these 2-boxes aren't really advanced detectors. IB/T/R mostly same but there have got to be some real improvements over the 30 or 40 years they have been around. Fisher, as I recall, built some of first ones back in the stone age.

I'll even get a few PCBs made by a professional and sell them at my cost if someone will provide me a decent schematic. I really think there is a lot to be said for the 2-box. Concept is simple, circuit is relatively simple, and I think if built right will get good depth for caches.

$700 for the ones on the market is ridiculous. I have bought a couple and they are all junk.

So please -- someone provide a good tested schematic w/ test results we could all compare when we build our box.

Goldfinder

[chemelec]

excusme
i say 0.1 16 v vcd
i entendded these condenser are old, i descotinued, tubulars horizontal, whit conections, in extremes

On the Older Paper Capacitors, (Tubular) The Line Represents the Outside Foil as Negative.
But they are Not really Polarized Unless they are Electrolytic caps.
And Reversing the Polarity on tose Caps does not cause them to fail.

This outside foil marking was partly done for Audio Circuits, because if there connect wrong, they are more likely to pick up HUM from surrounding parts and wires.

[detectoman]

thanks to you gary for you attention

le mando un saludo desde mexico, yo he sido asiduo de su destacada pagina, my congratulations chemelec y gracias , yo he tomado de su foro algunos diagramas

i can remplace these condenser, for poliprophilene caps? gary?

regards gary

jose

[Geo]

i am building one new detector, and in the complements or cap of diagram, the values are for example: 0.1 uf 16 v, vcd
these cap are polarized? or they are condenser? whitout polarization
i can install , cap, of poliprophilene? or only of electrilitics?
thanks for you attention

detectoman

You can use a non polarized capacitor without any problem.
Try it dont afraid.

[detectoman]

thanks brother geo, for these information very important for my
i have stop,these project for nedded this reference
i go continued build these

gracias hermano de aficion geo, por esa informacion muy importante para mi, ese proyecto lo tenia parado for falta de esa referencia, y es que nadie me podia aclarar correctamente en donde venden los componentes , ahora seguire adelante
un abrazo geo
mis saludos, dime si sabes español , para nuevas consultas, jejejej abusando de tu buena disposicion que ya habia notado , jose
regards

jose

[detectoman]

hi brother geo

the values of the capacitors, in the circuit of my project, are 15 mf 12 vdc
i can,t change this in polystyrene or poliprophilene because are extremely large
i can install polarized electrolitics? stitutions, thanks for your attention
help me for the solution

hola hermano geo, mira los capacitores de lo que te hablo, son de 15 microfaradios a 12 vdc y no puedo conseguirlos de polipropioleno o poliestireno porque en esta medida son demasiado grandes , dime que hago, o si puedo sustituirlos con electroliticos polarizados, claro esta respetando las polaridades debidas
gracias de antemano
joe

[kt315]

Help,
I am confuzed!

We must have at least a 1/2 dozen 2-box schematics and suggestions on this thread. Several have said they added more "stages" but no associated schematic. There are bits and pieces, references to ancient 2-box schematics, lots of speculation. I can do speculation very well but the proof is in the final product which is many times far between.

Please, would someone post or point me to a complete schematic. I tried building a 2-box from some of old schematics several years ago and it was a bust. I don't pretend to be a good electronic technician but these 2-boxes aren't really advanced detectors. IB/T/R mostly same but there have got to be some real improvements over the 30 or 40 years they have been around. Fisher, as I recall, built some of first ones back in the stone age.

I'll even get a few PCBs made by a professional and sell them at my cost if someone will provide me a decent schematic. I really think there is a lot to be said for the 2-box. Concept is simple, circuit is relatively simple, and I think if built right will get good depth for caches.

$700 for the ones on the market is ridiculous. I have bought a couple and they are all junk.

So please -- someone provide a good tested schematic w/ test results we could all compare when we build our box.

Goldfinder

I HAVE gave the schematic. what are you need yet of? I share out our info, but I DO NOT WANT beat my head in the wall!!! I do not want to reason that one is bad another is good. my English is not so good to prove that here. waste of time to prove - is not for me. you must be wise it and to learn yourselves what is good.

[chemelec]

hi brother geo

the values of the capacitors, in the circuit of my project, are 15 mf 12 vdc
i can,t change this in polystyrene or poliprophilene because are extremely large
i can install polarized electrolitics? stitutions, thanks for your attention
help me for the solution

hola hermano geo, mira los capacitores de lo que te hablo, son de 15 microfaradios a 12 vdc y no puedo conseguirlos de polipropioleno o poliestireno porque en esta medida son demasiado grandes , dime que hago, o si puedo sustituirlos con electroliticos polarizados, claro esta respetando las polaridades debidas
gracias de antemano
joe

Yes, use an electrolytic for that 15uF. Also it is not a problem if you use one with a higher voltage. (16 volt or 25 volts)