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]

Originally Posted by Esteban

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/Popular...lectronics.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]

Originally Posted by 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

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

[Astrodetect]

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

[Max]

Originally Posted by Esteban

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