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-   -   Pre amp for camera (http://www.diyaudio.com/forums/everything-else/128737-pre-amp-camera.html)

Fouko 26th August 2008 04:09 PM

Pre amp for camera
 
Hi to all and thanks a lot for this deep DIY audio forum,

I would like to build something like this unit :
http://www.beachtek.com/dxa4.html

for my camera.

I haven't find any diagram who explain how to do that simply

If anyone have something to show I'm ready.


Fouko
Excuse my french/english

Pano 28th August 2008 02:53 PM

Hi! Et bienvenu au forum!

It should not be too hard to build a mic preamp like that - just a dual opamp will do. I have seen plans around the web, but can't find any at the moment. (of course)

Does your microphone need power? That's going to make a difference.

leadbelly 28th August 2008 03:54 PM

Dude!

No opamps there, did you read the page?

"Since the adapters are passive devices, they are completely silent and the premium transformers ensure superb audio."

Basically, they are transformer based unbalanced/balanced converters.

Fouko 28th August 2008 04:02 PM

Hi,

Not the mic is a Rode NTG-2 with a 1.5v battery inside. So alim is not need external 48v phantom power.

In the unit I showed you, the Beachtek works without battery too.

leadbelly 28th August 2008 07:20 PM

You should tell us more what your main goal is. Do you want something that is high performance like the unit you showed, and will be relatively expensive? Or do you just want to do it as cheaply as possible?

Fouko 28th August 2008 09:14 PM

Quote:

Do you want something that is high performance like the unit you showed, and will be relatively expensive?
The unit is expensive, but in fact some people in the past have opened it and put the diagram on the web, today pictures are deleted.

But they said "you can buy each part at a local electronic shop for cheap." They are really disappointed to buy it, even the sound of this unit is really good.

leadbelly 28th August 2008 09:29 PM

Quote:

Originally posted by Fouko
But they said "you can buy each part at a local electronic shop for cheap." They are really disappointed to buy it, even the sound of this unit is really good.
I have my doubts about that, the device sounds like it uses premium transformers, and you can tell the difference in sound quality between an expensive transformer and a cheap one.

In any case, the interface can be done as simply as using 2 XLR jacks and 1 stereo phono plug and wire, or as complex as you finding 2 line level transformers locally if you really want to try to do something higher end. Which do you want to try?

Fouko 28th August 2008 09:58 PM

Ok your first choice isn't what I search, sure, I can build a simple adaptator on my wire for this.

But your secound choice
Quote:

2 line level transformers locally
seems beter.

I think the Beachtek unit is a passive one, there is non battery inside.

leadbelly 28th August 2008 10:07 PM

Well, if you already know how to wire up the connectors, then this is the only other piece of the puzzle:

http://jensentransformers.com/as/as002.pdf

Pano 29th August 2008 12:57 AM

Quote:

Originally posted by leadbelly
No opamps there, did you read the page?

No - I just looked at the pretty pictures! :xeye:

Thought it was a mic preamp to line level. There are a lot of those out there for the prosumer cameras.


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