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Re: Electronics, pricing and moral??

Subject: Re: Electronics, pricing and moral??
From: "Klas Strandberg" klasstrandberg
Date: Tue Sep 5, 2006 10:23 am (PDT)
Interesting that they try to explain something, but I have never seen a mic=

amp with the kind of adjustable "level-control" which they say is common.

Yes, at line levels, perhaps,  - or a -20db attenuation, yes, but not a
"level control" for microphone level. Have never seen it and I think every=

ordinary designer would shake his head.

Besides, if such an attenuation was possible  they are wrong. Many preamps=

generates the minimum
noise at max gain. In such a case, it is best to run the amp at max gain
and adjust the incoming level, to avoid distortion.

If you make a good preamp today, the gain level control comes with the
design. The only thing that differs a HQ from others is that a HQ has a
rotating switch for gain (like 20db steps) instead of a step-less
potentiometer. And it is 20 db between the steps, not 18,63.... or
something which you get from using standard resistor values.

But I am surprised that I have never seen these unbalanced preamps before!=

The need for them has been for long.

The only remaining question is the noise level. As I have said, it is not
difficult to design a low-noise mic amp, but.... for some reason they exist=
. ?

Klas.

At 14:42 2006-09-05, you wrote:
>Here is another link:
>http://reactivesounds.com/spa2.php
>So that makes four.
>Phil
>--- In  Klas Strandberg <>
>wrote:
> >
> > So now we are three? Or more? I didn't know there were such amps,
>only with
> > balanced inputs.
> >
> > Klas.
> >
> > At 12:30 2006-09-05, you wrote:
> >
> > > >
> > > > Not that I would advocate them but there are of course other batter=
y
> > > > preamps are available, Reactive Sounds Boost Box and those from The
> > > > Sound Professionals - have folks tried any of them ?
> > >
> > >
> > >
> > >I have used this:
> > >
> > >http://www.soundprofessionals.com/cgi-bin/gold/item/SP-PREAMP
> > >
> > >and you can hear the results on the binaural section of my website.
> > >
> > >Danny
> > >
> > >
> > >
> > >
> > > >
> > > > Nick Roast.    FEL Communications.   www.micbooster.com
> > > >
> > > > --- In  Klas Strandberg <telinga@>
> > > > wrote:
> > > > >
> > > > > yes, they might be ahead! Why should they do something bad?
> > > > > Is there a scheme somewhere??
> > > > > Nick Roast - where are you?? I am already finished with my design
> > >so I
> > > > > won't steal anything. But if you have made something which I
>believe
> > > > in, I
> > > > > can skip mine.
> > > > >
> > > > > Klas.
> > > > >
> > > > >
> > > > > At 21:11 2006-09-04, you wrote:
> > > > > >Looks like you might have been pipped at the post, sorry
>about the
> > > > pun,
> > > > > >just found this
> > > > > >which looks quite interesting:
> > > > > >www.felmicamps.co.uk/products/felbattpreamp.html
> > > > > >
> > > > > >Phil
> > > > > >
> > > > > >--- In  Klas Strandberg
><telinga@>
> > > > wrote:
> > > > > > >
> > > > > > > thanks, I know about them, - too big though, for this
> > > > application. I use
> > > > > > > the double Bulgin in metal case when I need 18v.
> > > > > > >
> > > > > > > Klas.
> > > > > > >
> > > > > > > At 17:29 2006-09-04, you wrote:
> > > > > > > >Klas,
> > > > > > > >For a battery case I would suggest something like this ...
> > > > > > > >
> > > > > > > >www.ELFA.se item Nr.  69-518-75 or
> > > > > > > >www.maplin.co.uk item MJ45Y
> > > > > > > >
> > > > > > > >mvh
> > > > > > > >Julian
> > > > > > > >Bristol, England
> > > > > > > >**************************************
> > > > > > > >
> > > > > > > >
> > > > > > > >Re: Electronics, pricing and moral??
> > > > > > > >     Posted by: "Klas Strandberg" telinga@ klasstrandberg
> > > > > > > >     Date: Sun Sep 3, 2006 12:46 pm (PDT)
> > > > > > > >
> > > > > > > >Can you give me a url or something to the battery case
>that you
> > > > suggest?
> > > > > > > >I usually use the one at
> > > > > > >
> >http://www.pactecenclosures.com/Plastic-Enclosures/HML-9VB.html
> > > > but black.
> > > > > > > >
> > > > > > > >Klas.
> > > > > > > >
> > > > > > > >
> > > > > > > >At 19:37 2006-09-03, you wrote:
> > > > > > > > >Klas Strandberg wrote:
> > > > > > > > > >I have decided what to do - I have already done it
>and will
> > > > make a
> > > > > > number
> > > > > > > > > >as soon as I have some time to:
> > > > > > > > > >
> > > > > > > > > >It is a
> > > > > > > > > >* Ultra Low Noise (!!!) Stereo mic preamp running on a
> > > > 9-volt battery,
> > > > > > > > > >* providing plug in power for all kinds of PIP mic's
> > > > > > > > > >* variable gain from 10 - 40 db.
> > > > > > > > > >* low impedance line output.
> > > > > > > > > >* big as a cig pack and about the same weight.
> > > > > > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >"Microphones are not ears,
> > >Loudspeakers are not birds,
> > >A listening room is not nature."
> > >Klas Strandberg
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
> > Telinga Microphones, Botarbo,
> > S-748 96 Tobo, Sweden.
> > Phone & fax int + 295 310 01
> > email: 
> > website: www.telinga.com
> >
>
>
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>

Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email: 
website: www.telinga.com







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