Two ultrasonic articles

[Esteban]

The both circuits are of 1963 and 1964, transistorized.

[Esteban]

Part of the circuit. Regarding rights, can't publish all it!

[Fred]

Part of the circuit. Regarding rights, can't publish all it!

Esteban, what is the % can you publish without infringing rights ? They are from ´63 !
Anyway, did you notice the same effect with this than with the wideband receiver and ferrite receiver?

[Esteban]

Fred

Maybe you're right, maybe not. This page has authorization. You can found here many articles, include the both.

http://www.swtpc.com/mholley/PopularElectronics/Popular_Electronics.htm

Regards

Esteban

[Esteban]

Here you can found another constructional article. With some modifications can work for capture some "phenomenon".

www.arrl.org/qst/2006/04/hanson.pdf

[Geo]

Esteban, thanks

[Max]

Part of the circuit. Regarding rights, can't publish all it!

Hi,
I think nobody will complain anything about that articles... you're becoming too politically correct !

Following you're new addiction to copyright rights we could also close the forum now... no more schematics... no more cloned devices!

All manifacturers will be happy from now on... no more reverse engineering of their products!

Kind regards,
Max

[Max]

Here you can found another constructional article. With some modifications can work for capture some "phenomenon".

www.arrl.org/qst/2006/04/hanson.pdf

Hi,
I read the document... looks interesting for to make an arcing detector... but how the hell this will pick up some treasure signal ???

I mean, it's a passive ultrasonic receiver.... that mix the signal from the transducer to a fixed one in the 38-40Khz range... thus giving some etherodyne effect... thus a beating at e.g. 1Khz or less you can hear in headphones.

Now... though this could be useful if wanna listen for BATS, how it's supposed to works as an LRL !?

I do not understand ! Still detecting something but without a "reason".

Kind regards,
Max

[Esteban]

Hi,
I read the document... looks interesting for to make an arcing detector... but how the hell this will pick up some treasure signal ???

I mean, it's a passive ultrasonic receiver.... that mix the signal from the transducer to a fixed one in the 38-40Khz range... thus giving some etherodyne effect... thus a beating at e.g. 1Khz or less you can hear in headphones.

Now... though this could be useful if wanna listen for BATS, how it's supposed to works as an LRL !?

I do not understand ! Still detecting something but without a "reason".

Kind regards,
Max

Max

You can use ideas here, not for to detect the arcing.

Regards

Esteban

[Max]

Max

You can use ideas here, not for to detect the arcing.

Regards

Esteban

Hi,
uhm... I'm trying to figure out what do you mean about that "ideas".

Ok... the circuit/project you posted a link is an ultrasonic receiver, very directive also cause of mechanical contruction.

Then we need an ultrasonic emission , right ???

So, by logic the target MUST emit that ultrasonics waves or be excited to emit ultrasonic waves.

Now... I don't know of any e.g. gold coin emitting ultrasounds... by itself!

So , always by logic only, you're saying that you excite the target , somehow... to e.g. emit or reflect some ultrasonics wave.

Now... always following that logic there are two main streams that could fit your assumption:

1. you excite the target with ultrasonic waves it will reflect back maybe modified in e.g. frequency or similar stuff

2. you excite the target with something that aren't ultrasonic waves... so who knows what ? maybe RF or something else... then you get BACK ultrasonic waves.

So... what do you like ? 1 or 2 ?

Kind regards,
Max

[Qiaozhi]

With my skeptical hat on ... I would suggest (with the ultrasonic circuit tuned close to instability) it would be possible to convince yourself, that you were really detecting a signal from a remote target. When in fact it was really scattering of the transmitted pulse.
Such a device would be less convincing than the pistol detector.

[Fred]

Based on what has been said here, i present i new LRL diagram.I am curious to know how it performs:
The 10k resistor in the lower left must be parapendicular to the target.

[Max]

Hi,
uhm... I'm trying to figure out what do you mean about that "ideas".

Ok... the circuit/project you posted a link is an ultrasonic receiver, very directive also cause of mechanical contruction.

Then we need an ultrasonic emission , right ???

So, by logic the target MUST emit that ultrasonics waves or be excited to emit ultrasonic waves.

Now... I don't know of any e.g. gold coin emitting ultrasounds... by itself!

So , always by logic only, you're saying that you excite the target , somehow... to e.g. emit or reflect some ultrasonics wave.

Now... always following that logic there are two main streams that could fit your assumption:

1. you excite the target with ultrasonic waves it will reflect back maybe modified in e.g. frequency or similar stuff

2. you excite the target with something that aren't ultrasonic waves... so who knows what ? maybe RF or something else... then you get BACK ultrasonic waves.

So... what do you like ? 1 or 2 ?

Kind regards,
Max

Still I'm awaiting for an answer...

[J_Player]

Still I'm awaiting for an answer...

Perhaps if you were to add a second ultrasonic transmitter to the circuit board with an intermediate frequency (slightly lower than the primary ultrasonic frequency), you could arrive at a BFO version of ultrasonics. By monitoring the difference signal, maybe you could locate treasure. I heard rumors this works for magnetic coils. why not for ultrasonic transducers?

Best wishes,
J_P

[Astrodetect]

Hello Esteban
When you say with some modifications, what modifications can we make to make it catch the phenomenon?