DIY passive balanced line level attenuator

[noviygera]

Need to have 1 db step attenuation for balanced line level signal

0 to -12db attenuation would be great. 1 db steps would make precise leveling of left and right channels.

Can you guys recommend a way to do this? Stepped 2 ch. attenuator per one BAL ch?


thanks,
Herman

 

[BesPav]

Can you guys recommend a way to do this?

Yes.
Use THS4131 with LT5400 for proper common-mode reject and converting symmetrical (balanced) line to unsymmetrical (unbalanced).
Use unsymmetrical (unbalanced) relay-based stepped or R2-R attenuator
Use THS4131 with output filter and common-mode choke for proper forming of output symmetrical (balanced) signal and rejecting noise from the output.

 

[noviygera]

Thanks, but I was looking for a simpler solution.
Would passive attenuation work?

 

[rayma]

Of course. You can configure this board however you need.
Balanced Strereo Attenuator

 

[noviygera]

Would this autoformer attenuator work?
Atlas Sound AT35 35W Auto Transformer Speaker Volume Control Stainless Steel

 

[rayma]

Would this autoformer attenuator work?
Atlas Sound AT35 35W Auto Transformer Speaker Volume Control Stainless Steel

That's for low power, unbalanced, low-fi background and PA systems (at speaker level).