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Old 8th March 2006, 11:48 AM   #1
roger-k is offline roger-k  Norway
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Default RIAA with balanced output?

RIAA with balanced output?
I want to build a RIAA-preamp with balanced output,
based on OP-amps.

Do you people know where I can find some schematics
or datasheets with any exemplifyes?

I have find many but not with balanced output.


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Old 8th March 2006, 12:04 PM   #2
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Default Re: RIAA with balanced output?

Quote:
Originally posted by roger-k
[B]RIAA with balanced output?
I want to build a RIAA-preamp with balanced output,
based on OP-amps.

Do you people know where I can find some schematics
or datasheets with any exemplifyes?

I have find many but not with balanced output.
That's because it's not something that's ever really required?.

If you REALLY want to do it (but please tell us why?), then simply use an RIAA preamp followed by a balanced driver - everything you need is here.

You could also use an active DI box, the Behringer DI20 has two channels, which could be used for this!.
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Old 8th March 2006, 12:31 PM   #3
roger-k is offline roger-k  Norway
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Why? Because my preamp has balanced input.
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Old 8th March 2006, 01:03 PM   #4
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Hi Roger,

Even then, balanced is only useful if you use long cable runs. For short cables you can wire that unbalanced anyway.

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Old 8th March 2006, 05:33 PM   #5
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Quote:
Originally posted by roger-k
Why? Because my preamp has balanced input.
As 'Pjotr' has already said, you can feed an unbalanced signal into your balanced input - it simply requires one of the inputs connecting to signal ground. I would expect your preamp instructions already explain how to do this?. If your input uses stereo jacks (rather than XLR's, or as well as?), then inserting a mono jack plug automatically makes it un-balanced.

There's likely to be no advantage in using it balanced?, the low impedance ouput of the RIAA stage, and the high signal level, render it pointless - unless you have an EXTREMELY long connection betwen the two items?.
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Old 8th March 2006, 07:02 PM   #6
Ghianni is offline Ghianni  Greece
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Hi all,

If you really need a phono stage preamplifier with a balanced output, go there http://www.rane.com/pdf/ps1sch.pdf

Ghianni.
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Old 8th March 2006, 07:25 PM   #7
roger-k is offline roger-k  Norway
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Actually I don't know what I need anymore.
But many thanks for the tip.
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Old 9th March 2006, 09:54 AM   #8
tubenut is offline tubenut  South Africa
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Correct me if I am wrong.....

A Phono cartridge is a balanced/differential source. There may be benefit in a completely differential RIAA stage from input to output plugged into a true balanced line input on a differential pre amp to differentail power amp?

I believe Jeff Rowland has or had one in their line up.

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Old 9th March 2006, 10:02 AM   #9
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Quote:
Originally posted by roger-k
Actually I don't know what I need anymore.
But many thanks for the tip.
Tell us EXACTLY what you are wanting to do, and we can offer suggestions!.
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Old 9th March 2006, 12:37 PM   #10
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Here's a balanced output RIAA pre -- note that Klaus biases the OPA637 into class-A mode:

http://www.klaus-boening.de/html/phonostage.html
http://www.klaus-boening.de/html/schematics.html#MKII
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