discrete balanced to unbalanced conveter?

[nightanole]

I can do balanced to unbalanced all day long with differential opamps. Is there away to do it simply with just fets or mosfets?

My dac is a Wolfson WM8741/wm8740 balanced voltage out with a 2.5v offset. Im trying to convert that to buffered unbalanced for $20 or less a channel. I already am in on the dcb1 buffer group buy, but that doesnt help me here.

 

[mjf]

hello.
really 2,5v offset?

 

[firechief]

I kinda wonderwhat the filter looks like, and yes why there is any ofset at all?I was just going to recomend a transformer, but you need to post a schematic or something. Is in a DYI player or what?

 

[firechief]

or go here WM8741 datasheet and Application Note, Data Sheet, Circuit, PDF, Pinout | Datasheet Archive
get the data sheet (65 pages), down near the end they spell it out for you with a nice little op amp application. How convienent

 

[richie00boy]

Discrete balanced input circuitry tends not to be done because due to device tolerances the critical parameter of common mode rejection ratio is usually ends up massively worse in comparison to a chip solution. Anyway the cost difference between a chip and discrete is literally nothing.

 

[nightanole]

Yea im just gonna rig the opamp with positive and negative rails so i dont have to cap couple more the once.

Ya the wolf dac (i thought most) idles at 2.5v and then swings 0-5. If it didnt then id need a positive and negative rail to the dac.

How else would it work with modern dacs that just accept 3.3 and 5vdc?