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Old 23rd October 2005, 11:00 PM   #1
Quattor is offline Quattor  France
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Unhappy Audio Balanced Buffered Line Driver

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
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Old 23rd October 2005, 11:14 PM   #2
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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
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Old 23rd October 2005, 11:19 PM   #3
Quattor is offline Quattor  France
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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.
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Old 23rd October 2005, 11:31 PM   #4
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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...
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Old 23rd October 2005, 11:36 PM   #5
Quattor is offline Quattor  France
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Haven't thought much about it yet, but LM317T comes to my mind, just for the prototype or conversation sake.
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Old 23rd October 2005, 11:52 PM   #6
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LM317T ??
current source ??
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Old 24th October 2005, 07:32 AM   #7
Nisbeth is offline Nisbeth  Denmark
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Sure, a resistor between ADJ and OUT turns the LM317 into a CCS - it's in the datasheet


/U.
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Old 24th October 2005, 07:33 AM   #8
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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.
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Old 24th October 2005, 07:58 AM   #9
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Thanks, I checked datasheet and this really is possible, but not here! LM317 needs at least 3V drop.
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Old 24th October 2005, 04:07 PM   #10
Quattor is offline Quattor  France
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Huh, it may be just a good looking schematic after all. But here is the solution in a little bit different manner.
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