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Unbalance to balance?
Unbalance to balance?
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Old 12th January 2018, 03:53 PM   #1
cpc748 is offline cpc748  United States
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Default Unbalance to balance?

I just got done building an Audio Note L2 preamp kit with RCA outputs. I'd like to convert it to balanced XLR.

Is there away to do it internally with different board or transformer?

Please advise.
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Old 12th January 2018, 03:56 PM   #2
Speedskater is offline Speedskater  United States
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It's easy, just a few resistors, capacitors and an XLR connector.
I'll look for the Jensen page.

It's AN-003
Schematics | Jensen Transformers
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Last edited by Speedskater; 12th January 2018 at 04:05 PM.
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Old 12th January 2018, 04:36 PM   #3
AndrewT is offline AndrewT  Scotland
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and the same implementation is used for the balanced output of B.Putzeys' Balanced volume control.
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Old 12th January 2018, 04:51 PM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Use a TL072 per side for a convertor.
Here is a simple circuit; Balanced-Unbalanced Converter For Audio Work Circuit Diagram
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Old 12th January 2018, 04:55 PM   #5
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by cpc748 View Post
I'd like to convert it to balanced XLR.
Why? There may be more lost than gained
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Old 12th January 2018, 05:15 PM   #6
Bare is offline Bare  Canada
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But where's the Bragging rights in that
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Old 12th January 2018, 05:17 PM   #7
analog_sa is offline analog_sa  Europe
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Quote:
Originally Posted by scottjoplin View Post
Why? There may be more lost than gained
Especially following the advice from #4
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Old 13th January 2018, 09:31 PM   #8
cpc748 is offline cpc748  United States
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Quote:
Originally Posted by Speedskater View Post
It's easy, just a few resistors, capacitors and an XLR connector.
I'll look for the Jensen page.

It's AN-003
Schematics | Jensen Transformers
You will need to sign-up, but they don't use it for ads.
Thanks, I'll look into it.
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Old 13th January 2018, 09:32 PM   #9
cpc748 is offline cpc748  United States
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Quote:
Originally Posted by JonSnell Electronic View Post
Use a TL072 per side for a convertor.
Here is a simple circuit; Balanced-Unbalanced Converter For Audio Work Circuit Diagram
Thanks
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Old 14th January 2018, 09:40 AM   #10
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by JonSnell Electronic View Post
Use a TL072 per side for a convertor.
Here is a simple circuit; Balanced-Unbalanced Converter For Audio Work Circuit Diagram
Quote:
Originally Posted by cpc748 View Post
Thanks
I read through the article and unfortunately he has got much mixed up.

Balanced impedance connections are all about improved interference rejection due to the IMPEDANCES being balanced.

Differential voltages are used in both balanced and unbalanced equipment.
An opamp is a differential voltage measuring device. Yes, even in an unbalanced arrangement the opamp is still differential but without any of the extra interference rejection of a balanced impedance connection.

I suggest you ignore the "Learning Electronics" article and refer instead to Jensen's AN003
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Last edited by AndrewT; 14th January 2018 at 09:43 AM.
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