RIAA with balanced output?

roger-k · 8th March 2006, 11:48 AM

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.

__________________
Roger

Nigel Goodwin · 8th March 2006, 12:04 PM

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!.

roger-k · 8th March 2006, 12:31 PM

Why? Because my preamp has balanced input.

Pjotr · 8th March 2006, 01:03 PM

Hi Roger,

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

Cheers

Nigel Goodwin · 8th March 2006, 05:33 PM

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?.

Ghianni · 8th March 2006, 07:02 PM

Hi all,

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

Ghianni.

roger-k · 8th March 2006, 07:25 PM

Actually I don't know what I need anymore.
But many thanks for the tip.

tubenut · 9th March 2006, 09:54 AM

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.

Nigel Goodwin · 9th March 2006, 10:02 AM

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!.

jackinnj · 9th March 2006, 12:37 PM

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

8th March 2006, 11:48 AM	#1
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	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. __________________ Roger __________________ Roger

8th March 2006, 12:31 PM	#3
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Why? Because my preamp has balanced input. __________________ Roger

8th March 2006, 07:25 PM	#7
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Actually I don't know what I need anymore. But many thanks for the tip. __________________ Roger

9th March 2006, 09:54 AM	#8
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	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. __________________ Guillaume Croak Audio Exploration

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8th March 2006, 01:03 PM	#4
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi Roger, Even then, balanced is only useful if you use long cable runs. For short cables you can wire that unbalanced anyway. Cheers

8th March 2006, 07:02 PM	#6
Ghianni diyAudio Member Join Date: Sep 2005	Hi all, If you really need a phono stage preamplifier with a balanced output, go there http://www.rane.com/pdf/ps1sch.pdf Ghianni.

9th March 2006, 12:37 PM	#10
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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