Military equipment: microphone eavesdropping - (DIY)

[adorn751]

Military equipment: microphone eavesdropping - (DIY).

 

[JMFahey]

Care to share some details?
Thanks.

 

[adorn751]

I'm sorry, but for details it is only my good project, but nothing more can be done.
Some more drawings and electronic diagrams.

 

[llwhtt]

Why the post?

Craig

 

[adorn751]

Re:

For my topic no questions, and only you can see and learn.

 

[sbrads]

There's not usually much to learn from 99% of military schematics. They're so long in design, development and trials that they're often 10-20yrs out of date design-wise when in service. Anything unclassified will also be pretty low tech.

 

[JMFahey]

Well, NOW we know what East German STASI Hauptmann Gerd Wiesler and Oberstleutnant Anton Grubitz used in:
The Lives of Others trailer - YouTube
Just sayin'

By the way, rent and watch it: impressive:
The Lives of Others (2006)
Das Leben der Anderen (original title)

 

[adorn751]

Military ICs little learning. I did a clean audio amplifiers audio signals and have good quality.

 

[adorn751]

Re:Military equipment

Re:Military equipment.

 

[JMFahey]

Yes, I've seen it.
A dozen "variations" of the exact same circuit, but not the slightest explanation as to what it is, what it does, some picture, who makes it, what Army (or Country) ever used it, etc.

 

[xslavic]

its a metal detector if im not wrong

 

[adorn751]

My technique gives the best sound listening.

 

[adorn751]

Re:Military equipment

Maybe someone wants to make luxury and expensive wiretapping?
Diagram headphone amplifier is top-notch, made ​​to ordinary audio transistor.

 

[JMFahey]

Offer it to the FBI.
They are *very* interested in knowing what Jim Morrison speaks with his groupies behind closed doors.
Do you think it's up to the task?

 

[llwhtt]

I think something is getting lost in the translation, I know I'm lost.

Craig

 

[JMFahey]

I think something is getting lost in the translation, I know I'm lost.
Craig

You're not the only one.
People in Poland don't understand this either

 

[wg_ski]

For this purpose all the magic would be in the DSP post processing. It's not all that much of a stretch to get down to the theoretical 1.7 nV per root Hz noise floor of the bipolar transistor. So the magic has got to be digging the signal you want to hear out of background noise (that the mic will pick up). Those algorithms are probably mega-classified an not easily DIY. A low noise preamp is the EASY part.

 

[adorn751]

The best DIY I showed, not the theory of computation is important. Audio system is set and thus reality can be checked in practice.
Confirm that the audio quality of the sound itself could not be better. More of my audio technique I do not have to show.

 

[JMFahey]

can be checked in practice.

Which means you built at least one.
Please post some pictures.