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Old 17th January 2014, 10:58 AM   #91
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Hi Eric

I would choose version 2, since it has the same IC and strong relay. Version 1 has also RLC filter which is not needed in our case, First One has it already.

First One has un-balanced (single ended) input, so if you would like to use your preamp's balanced output than I would suggest you to:
1. use Lundhal line transformer in between or
2. simply use just positive output referenced to GND or
3. use two First One modules per channel in full balanced configuration

Regards, L.C.
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Old 17th January 2014, 01:38 PM   #92
Eric06 is offline Eric06  France
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Hi LC,
Thanks a lot for your swift answer.
If a line input transformer, perhaps then the LL1540 ?
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Old 17th January 2014, 02:58 PM   #93
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Hi LC,

Can you show (with a schematic) how we can connect 2 FO in full balanced configuration
and what about with output power at 4 ohms.

The 2 FO must be matched ?

Thanks
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Old 17th January 2014, 09:11 PM   #94
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Quote:
Originally Posted by Eric06 View Post
Hi LC,
Thanks a lot for your swift answer.
If a line input transformer, perhaps then the LL1540 ?
Yes, exactly this one. Secondary RC serial load for optimal square wave response.
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Old 17th January 2014, 09:56 PM   #95
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Lightbulb First One - Full Balanced Stereo

Quote:
Originally Posted by Theodosis O. View Post
Hi LC,

Can you show (with a schematic) how we can connect 2 FO in full balanced configuration
and what about with output power at 4 ohms.

The 2 FO must be matched ?

Thanks
Here are the First One amplifier modules in full balanced stereo configuration.

First One has voltage gain in very tight tolerances, so doesn't need to be extra matched.

Watch the slew rate info.
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File Type: jpg First One - Full Balanced.jpg (430.4 KB, 628 views)
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Old 17th January 2014, 11:58 PM   #96
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I don't think that the balanced circuit in post #95 is going to work very well (and not at all if the source has an audio output transformer). XLR pin #1 is not part of the audio circuit, it is only a shield connection to the chassis.
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Old 18th January 2014, 12:08 AM   #97
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Hi Speedskater

OK, worse case scenario, galvanic isolation between preamp and First One full balanced amp with transformer coupling. Secondary of the transformer connected to two 10 kOhm input resistors located in each First One channel, referenced to GND, so symmetry of the secondary +/- voltages according to GND potential guarateed. Need more?
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Old 18th January 2014, 12:23 AM   #98
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Any schematic?
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Old 18th January 2014, 12:34 AM   #99
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Quote:
Originally Posted by Speedskater View Post
Any schematic?
Try to think that sch is the same as transformer's secondary would have two 10 kOhm resistors in series connected to this secondary. Mid point of resistors connected to GND, so symmetry of the secondary voltage to GND is assured in this way. +V and -V have exactly the same potential to GND except that they are inverted.
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Old 18th January 2014, 01:08 AM   #100
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Like this?
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File Type: jpg X_former_bal.jpg (45.5 KB, 566 views)
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