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roger-k 8th March 2006 11:48 AM

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

Nigel Goodwin 8th March 2006 12:04 PM

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!.

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


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