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DIY passive balanced line level attenuator
DIY passive balanced line level attenuator
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Old 11th March 2020, 11:29 PM   #1
noviygera is offline noviygera  United States
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Join Date: Mar 2009
Default DIY passive balanced line level attenuator

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
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Old 12th March 2020, 10:16 AM   #2
BesPav is offline BesPav  Russian Federation
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Join Date: May 2011
Location: Russia, Moscow
Quote:
Originally Posted by noviygera View Post
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.
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Old 13th March 2020, 10:42 PM   #3
noviygera is offline noviygera  United States
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Thanks, but I was looking for a simpler solution.
Would passive attenuation work?
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Old 13th March 2020, 11:15 PM   #4
rayma is offline rayma  United States
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Join Date: Apr 2011
Of course. You can configure this board however you need.
Balanced Strereo Attenuator
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Old 16th March 2020, 02:18 AM   #5
noviygera is offline noviygera  United States
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Would this autoformer attenuator work?
Atlas Sound AT35 35W Auto Transformer Speaker Volume Control Stainless Steel
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Old 16th March 2020, 02:32 AM   #6
rayma is offline rayma  United States
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Join Date: Apr 2011
Quote:
Originally Posted by noviygera View Post
That's for low power, unbalanced, low-fi background and PA systems (at speaker level).

Last edited by rayma; 16th March 2020 at 02:59 AM.
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