Audio Balanced Buffered Line Driver

Quattor · 24th October 2005, 12:00 AM

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 · 24th October 2005, 12:14 AM

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.as...r=60.1842-9999

Wes

Quattor · 24th October 2005, 12:19 AM

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 · 24th October 2005, 12:31 AM

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 · 24th October 2005, 12:36 AM

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

darkfenriz · 24th October 2005, 12:52 AM

LM317T ??
current source ??

Nisbeth · 24th October 2005, 08:32 AM

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

/U.

dx.master · 24th October 2005, 08:33 AM

Hello,

Quote:

Originally posted by darkfenriz
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 · 24th October 2005, 08:58 AM

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

Quattor · 24th October 2005, 05:07 PM

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

24th October 2005, 12:14 AM	#2
wes-ninja250 diyAudio Member Join Date: Feb 2005 Location: Kingston, ON	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.as...r=60.1842-9999 Wes __________________ Do daemons dream of electric sleep()?

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24th October 2005, 12:19 AM	#3
Quattor diyAudio Member Join Date: May 2003 Location: Paris	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.

24th October 2005, 12:31 AM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	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...

24th October 2005, 12:36 AM	#5
Quattor diyAudio Member Join Date: May 2003 Location: Paris	Haven't thought much about it yet, but LM317T comes to my mind, just for the prototype or conversation sake.

24th October 2005, 12:52 AM	#6
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	LM317T ?? current source ??

24th October 2005, 08:32 AM	#7
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Sure, a resistor between ADJ and OUT turns the LM317 into a CCS - it's in the datasheet /U.

24th October 2005, 08:58 AM	#9
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Thanks, I checked datasheet and this really is possible, but not here! LM317 needs at least 3V drop.

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