looking for passive cut only eq schematics with I/O transformers

[jtvrdy]

Hi,
I'm looking for a passive cut only eq schematics with input and output transformers,
will be used in line level,high pass,low pass , and some fixed freq/q cut band.

thanks,

 

[petermontg]

Filter designs here and info
www.forsselltech.com/media/.../Evolution_of_an_EQ_Design2.pdf

You can take the pultec I/O listed on the gyraf page

 

[jtvrdy]

something as simple as this will work?

 

[gyraf]

No, not without resistors.

Look at first half of Neumann PEV for an example:

http://www.gyraf.dk/schematics/Neumann_pev.gif

Jakob E.

 

[gyraf]

Or the Neumann W75k passive bandpass - attached

 

[gyraf]

On the simpler side, Simple passive Eq at 40Hz - 3k - 16k:

 

[gyraf]

Or even simpler - Simple Passive high/low EQ:

 

[jtvrdy]

thanks!
on the Neumann_pev the DR1 and DR2 are coils?
the circuit must be balanced as on the w75k?

 

[gyraf]

yes, DR1/DR2 are coils

Ü1/Ü2 are transformers

in PEV