unbalanced to balanced converter

[PMA]

Here it is:

 

[haldor]

It's not the final word on how to create an impedance balanced output, but Rick has some interesting comments about the tradeoffs of different ways of doing this. Note that using cross-coupled op-amps to create an unbalanced output also has problems, especially if they are ever connected to an unbalanced input.

http://www.prosoundweb.com/install/sac/n27/rick/balout-1.shtml

P.S. The only aspect of a balanced signal source that makes possible a higher CMR is how well balanced the impedances of the two source pins are. Having a differential signal on the + and - signal leads is irrelevant to this issue. Since improved CMR is the reason people use balanced wiring this is worth consideration.

Phil

 

[Steve Eddy]

Here it is:

That'd work.

But if you don't need that additional 6dB of gain, you can accomplish the same thing more simply with this arrangement:

 

[JOE DIRT®]

I`m surprised the DRV134 has not been mentioned yet in this thread......I have a couple and the specs seem pretty good

DIRT®

 

[jleaman]

This is for joedirt


DRV134


i have yet to try mine. but soon i guess.

 

[PMA]

I`m surprised the DRV134 has not been mentioned yet in this thread......I have a couple and the specs seem pretty good

DIRT®

Of course, DRV134 for unbalanced --> balanced, and INA134, INA217 and INA103 for balanced --> unbalanced converters.

 

[JOE DIRT®]

PMA thanks for the reply

I am aware of the INA devices as they are the mates

and Jason let me know if you get around to utilising one before I do...my hopes are up on it

DIRT®

 

[PMA]

Joe,

very soon I will try INA134 and INA217 ...