matthias
Well-known member
hi,
I want to build a passive lowcut filter for mastering (stereo)...
to roll off unnecessary freqs...
each channel with a 12 pos switch to select the indivdual cut frequency...
calculating the frequencies is very easy using this great calculator: http://www.opamplabs.com/rfc.htm
this tool gives me the values for the resistor and capacitor that I connect in series to achieve a -6db lowcut filter.
so far.. so good...
1. do I need transformers for in and output??
2. can I use one capacitor for each filter and just vary the value of the resistor with the switch ??
3. should I use a certain resistor value and switch between 12 different caps??
if this is the way to go, is it ok to connect caps in parallel?? or wouldn't you suggest this...???
thank you
mat
I want to build a passive lowcut filter for mastering (stereo)...
to roll off unnecessary freqs...
each channel with a 12 pos switch to select the indivdual cut frequency...
calculating the frequencies is very easy using this great calculator: http://www.opamplabs.com/rfc.htm
this tool gives me the values for the resistor and capacitor that I connect in series to achieve a -6db lowcut filter.
so far.. so good...
1. do I need transformers for in and output??
2. can I use one capacitor for each filter and just vary the value of the resistor with the switch ??
3. should I use a certain resistor value and switch between 12 different caps??
if this is the way to go, is it ok to connect caps in parallel?? or wouldn't you suggest this...???
thank you
mat