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Old 17th July 2008, 06:32 PM   #1
Berry is offline Berry  Netherlands
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Default balanced/unbalanced preamplifier

What is the best schematic ?
If there are better one's please let me know. I wil use it for an aleph 5.
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Old 20th July 2008, 06:22 PM   #2
juma is offline juma  Serbia
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Berry,
OpAmps are second choice parts for this job. To do it properly you need a fully differential amp (OPA1632,THS4131....)
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Old 20th July 2008, 06:50 PM   #3
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First of all, this is the wrong forum for this thread. It should be in SS or Pass labs.

Quote:
Originally posted by juma
OpAmps are second choice parts for this job. To do it properly you need a fully differential amp (OPA1632,THS4131....)
AFAIK, using a diff opamp will actually make a very mediocre phase splitter.

The best topology for phase splitting with opamps is this:
Click the image to open in full size.

Which is what the inside of a DRV13x chip looks like.

HOWEVER, it is silly to use an opamp to do the splitting for an Aleph IMHO. The Aleph frontend should do a better job of phase splitting itself. If you absolutely need more gain I suggest you look at a discrete phase splitter.
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Old 20th July 2008, 10:09 PM   #4
juma is offline juma  Serbia
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Quote:
Originally posted by leadbelly

AFAIK, using a diff opamp will actually make a very mediocre phase splitter.
The best topology for phase splitting with opamps is this:
http://sound.westhost.com/p87-f3.gif
Which is what the inside of a DRV13x chip looks like.
Try to compare directly (sound-wise) DRV134 to OPA1632 and you'll easily comprehend that DRV134 is by far inferior circuit.
I'm not willing to start a debate on this - just delivering commonly known fact.
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Old 20th July 2008, 11:37 PM   #5
gregorx is offline gregorx  United States
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Have you taken a look at these:
THAT1646
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Old 21st July 2008, 06:07 PM   #6
Berry is offline Berry  Netherlands
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Thank you all !

The reason i do not use an Aleph pre is because it does not fit in the nad T162. The NAD tuner/preamp has no balanced output.
I can use the power supply of the NAD to drive an op-amp, to build an balanced output.
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Old 21st July 2008, 08:09 PM   #7
Berry is offline Berry  Netherlands
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Last question,

Is this the circuit to use to go from unbalanced to balanced ?
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File Type: gif opa1632.gif (4.3 KB, 1368 views)
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Old 22nd July 2008, 08:58 AM   #8
juma is offline juma  Serbia
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http://www.diyaudio.com/forums/showt...26#post1563426
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Old 24th July 2008, 12:09 AM   #9
digi01 is offline digi01  China
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i built the real thing.

bridge preamp

drv134 version

zang
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Old 8th August 2008, 06:46 AM   #10
Berry is offline Berry  Netherlands
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I build the drv134 version, the problem that i have more noise than sound ?

The Amp for wich i will use it, is an aleph 5. When i put 2 capacitors in the + and the -, the noise dissapear. Why is it not possible to drive the aleph direct by the drv134 ?
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