To build a high pass RL line level filter

noviygera · 13th February 2012, 03:36 AM

Hello, I'd like to ask for help. I would like to remove my digital crossover and replace it with a RL HIGH PASS line level filter as an experiment.

Crossover freq is 335Hz, the amp input impedance is switchable, 600, 20K, 100K ohms (I am using 100K ohms). I am interested in a simple, 6db/octave filter slope.

Can you please tell me the values of R and L that I need? Or, if possible, how can I compute them on my own.

Thank you,
Herman

mickeymoose · 13th February 2012, 02:03 PM

Try the free Filterlab by Microchip and/or Filterpro by TI. E

sreten · 13th February 2012, 02:38 PM

Hi,

Why aren't you considering reducing the amplifiers
input coupling capacitor to do the same thing ?

rgds, sreten.

mdynac · 14th February 2012, 12:18 AM

so how would i go about calculating a 150hz high pass filter for this input section?

noviygera · 14th February 2012, 02:56 AM

I forgot to state that I am making a PASSIVE line level filter, not active. Using coupling capacitor, what would be the RC values that I need?

sreten · 03:07 AM

Quote:

Originally Posted by mdynac

so how would i go about calculating a 150hz high pass filter for this input section?

Hi,

I'd be guessing without working out whats going on there, and I don't
have the time to do that. If input impedance is 100Kohm then a 0.01uF
will give a 150Hz high pass in series with the input. But seeing that
coupling caps are a concern regarding quality it makes more sense
to change the internal coupling capacitor than add an external.

rgds, sreten.

And 0.0047uF, 4.7nF a 335Hz high pass for 100K ohm in.

13th February 2012, 03:36 AM	#1
noviygera diyAudio Member Join Date: Mar 2009	To build a high pass RL line level filter Hello, I'd like to ask for help. I would like to remove my digital crossover and replace it with a RL HIGH PASS line level filter as an experiment. Crossover freq is 335Hz, the amp input impedance is switchable, 600, 20K, 100K ohms (I am using 100K ohms). I am interested in a simple, 6db/octave filter slope. Can you please tell me the values of R and L that I need? Or, if possible, how can I compute them on my own. Thank you, Herman

13th February 2012, 02:38 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Why aren't you considering reducing the amplifiers input coupling capacitor to do the same thing ? rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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13th February 2012, 02:03 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	Try the free Filterlab by Microchip and/or Filterpro by TI. E

14th February 2012, 02:56 AM	#5
noviygera diyAudio Member Join Date: Mar 2009	I forgot to state that I am making a PASSIVE line level filter, not active. Using coupling capacitor, what would be the RC values that I need?