Audio Balanced Buffered Line Driver

[Quattor]

Hi ya all,

Can this be done like this? It seems it should work, at least in simulation, but I'm interested in real life application since I need one. Has any one tried something like this or should I give it my name? 😀

Or is this another JAFA idea?

Thanks and best regards!




P.S. JAFA - Just Another Fu**ing Amateur

 

[wes-ninja250]

Have you seen the TI (Burr-Brown) DRV134? I think that would do what you want in one chip.

7.80 ea at selectronic.fr

http://www.selectronic.fr/article.asp?article_ref_entier=60.1842-9999

Wes

 

[Quattor]

Yes, I've seen it, and few others for that matter. But I want it buffered and I want to be able to play with it in the future (read: to change operational amplifiers and review their sonic impact). Until, of course, I build completly discreete version of it.

 

[darkfenriz]

How do you intend to implement current source?
Seems to have to work with negative voltages too.
I doubt if a single JFET source will do...

 

[Quattor]

Haven't thought much about it yet, but LM317T comes to my mind, just for the prototype or conversation sake.

 

[darkfenriz]

LM317T ??
current source ??

 

[Nisbeth]

Sure, a resistor between ADJ and OUT turns the LM317 into a CCS - it's in the datasheet 🙂


/U.

 

[dx.master]

Hello,

LM317T current source ??

Yes, please look at this picture 'LM317T current driver'.

I build the "Zeus Power Amplifier by Susan Parker" and there we need one Current Driver. My choice was the LM317T.

 

[darkfenriz]

Thanks, I checked datasheet and this really is possible, but not here! LM317 needs at least 3V drop.

 

[Quattor]

Huh, it may be just a good looking schematic after all. But here is the solution in a little bit different manner.

 

[darkfenriz]

yeah, much better