unbalanced to balanced

[oiphy]

I believe I read something about this topic a while ago. Might be wrong , but think it was a passive solution or not based on opamps..? anyone remember?

 

[MarcelvdG]

Signal transformer? Or simply connecting pin 3 to the ground of the source, with or without a network that mimics the source's impedance?

 

[oiphy]

no not trafo or shortcut connection... cant really remember but think N.pass might have shared a link??

 

[Galu]

This was posted a short time back.

 

[oiphy]

no...not what im thinking about... damn it...knew i should have bookmarked it ...

 

[oiphy]

was a build with circuit board resistors so on.....

 

[dtaylo3]

Parts Express quality solution

ART DTI Dual Transformer/Isolator

Works well. Signals are isolated. Transformer inside.

You can build something similar.

 

[oiphy]

ART DTI Dual Transformer/Isolator

Works well. Signals are isolated. Transformer inside.

You can build something similar.

thanks. will look into it, need to use my myriad preamp non balanced for a setup with a complete set b&o active speakers using balanced input....might go for wireless, ReCreate | Bang & Olufsen.... not sure yet

 

[Galu]

Was it something like this?

 

[oiphy]

Was it something like this?

nah..... might have been another place.... i dunno... argh.. was several components on a board.... might have been small transistors instead of tl071, 555 so on ...

 

[Galu]

need to use my myriad preamp non balanced for a setup with a complete set b&o active speakers using balanced input

Which B&O actives do you have?

 

[oiphy]

beolab 6000, beolab penta mk3 , beolab 2 sub, beolab 7-2 center

 

[oiphy]

also have beovision 4-50, beosystem3, and beosound 9000 cd. but want use them...

 

[Galu]

My friend has BeoLab 6000 active speakers.

According to the specifications each 6000 speaker has an RCA phono line input, same for the Penta 3.

Why are you requiring a balanced input?

 

[leadbelly]

You are probably referring to Figure 2.4 https://www.google.ca/url?sa=t&sour...FjAAegQICBAC&usg=AOvVaw2oLamhrPpXDJY8ViDk1P7k

 

[wintermute]

I Breadboarded the circuits in this post (but still haven't got around to doing a verro or proper pcb for them. P3 Adjustment for the average Hobbyist

Tony.

 

[Douglas Blake]

A balanced cable carries 2 identical signals out of phase. This is often the exact same signal as on an RCA cable but with only one phase present.

So... with TRS and RCA connectors...

Balanced output to RCA input
Sleeve ---> RCA Shield
Ring ---> not connected
Tip ----> RCA Center

RCA out to Balanced input
RCA Shield ---> Sleeve
RCA Shield ---> Ring
RCA Center ---> Tip

These are not ideal connections --it is always best to connect like to like-- but in a crush they do work.

 

[BesPav]

The best "enginerical" way is to use any of the fully-differential amplifiers (FDA). This will provide you with a couple of benefits, but will demand to have a supply.
Having a proper source, without dramatical rise of THD at comparatively low load, you can use datasheet connection of THS4131 like first attached, while badly designed sources could demand for high-input impedance instrumentation amplifier to be placed instead of the FDA like last attached.

 

[leadbelly]

I can't believe how many threads are on this topic and how they continue to include misinformation all the time.
Balanced and Differential
"Balanced signaling is two conductors (with an optional shield) that have equal impedance to ground.

Differential signaling is two conductors (with an optional shield) transmitting the same signal at opposite polarity."

 

[benb]

Maybe it was one of the many diagrams on this page. It's been around forever (at least in net.time) and has just about every passive connection.
Sound System Interconnection