[sdiy] Semi-OT: phantom-powered balanced line driver?

[Magnus Danielson]

From: René_Schmitz <uzs159 at uni-bonn.de>
Subject: Re: [sdiy] Semi-OT: phantom-powered balanced line driver?
Date: Tue, 10 Oct 2006 22:12:19 +0200
Message-ID: <452BFEA3.8010407 at uni-bonn.de>

> Hi Ingo and Magnus,

Hi René,

> Magnus Danielson wrote:
> 
> > I would use rather classic op-amps for the drive, such as the NE5534 or NE5532.
> > I would avoid using the capacitor solution if I can and use a propper
> > transformer and take out the voltage on the center-tap. Regardless if you drive
> > the transformer single-ended or diffrentially you want a series-cap to avoid
> > saturating it with DC.
>  >
> > But that's me.
> 
> Me too. Takeing the voltage with a center tap is a snap, even if you 
> don't have that, you can get the supply voltage at a virtual center, the 
> mid of two resistors from either side.

You DONT want to do that for power, please! Brr...

But OK, if you don't consume that much current you could do that, but it feels
soo ugly. It goes into my book of ugly quick-hacks.

> Blocking caps at that impedance (600 ohm -> ~10uF) are quite bulky as 
> well, if you want a decent quality (=film) type. With the transformer 
> you only need one on the primary side.

Besides, it always feels good to do it properly the good old way! ;O)

Cheers,
Magnus