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

[René Schmitz]

Hi Ingo and Magnus,

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.

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.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159