My DIY active audio filter... LR24 db/octave filter.
Hi, this is to showcase my project, which is a 4-way Linkwitz Riley, Active crossover filter which divides the audio signal in to 4 separate frequency bands. Being a 24 dB / octave has steeper slopes and therefore requires proper matching of resistors and capacitors so that errors are minimised and summed frequency response is flat across the entire audio spectrum.
Disclaimer: This is a DIY project and is therefore not intended for any commercial production.
I will be primarily focussing on the build which I believe that it will aid the beginners to have enough motivation to startup their work. If you require the understand the functioning of the circuit the same can be studied from the original source and reputed forums on net elsewhere. Links can be found below.
The PCB has been designed with "Diptrace" which is free of cost and very easy to use for beginners, with good standard library of componenets and one can easily draw schematics as well as PCBs with this software. The software is limited but if you want you can buy the full version. Still the free version does all the job.
The PCB therefore is a home brewed one which is fabricated using the toner transfer method.
Frequency Bands of my version:-
Low pass: 110Hz and below
Low Band Pass: 110Hz to 284Hz
Mid Band Pass: 284Hz to 2840Hz
High Pass: 2840Hz and above
Circuit diagram: The same can be found at the link as below:-
4-Way Linkwitz-Riley Crossover
PCB
All resistors used are 1% metal film resistors and matched for each section along with the capacitors.
For the Opamps have used TL072 which does the job very well, this can be used for Filter section but for buffer section, it's better to use NE5532. Depending upon ones liking different Opamps can be used, even the most expensive ones from Burr Brown. Choice is entirely yours.
For testing purpose Screw terminals has been used but when final integration is done it's better to solder the wires directly to the board for better performance and overall lower noise levels.
For builders who wants to build this without matching componenets can ofcourse go for it without any issues.
For my design have used the below combination of RC for the targeted frequency bands, If you want to go for these bands you can follow the values in your design. Or if you want to calculate your own values it can be done by taking the help of the calculator form ESP site.
Hi, this is to showcase my project, which is a 4-way Linkwitz Riley, Active crossover filter which divides the audio signal in to 4 separate frequency bands. Being a 24 dB / octave has steeper slopes and therefore requires proper matching of resistors and capacitors so that errors are minimised and summed frequency response is flat across the entire audio spectrum.
Disclaimer: This is a DIY project and is therefore not intended for any commercial production.
I will be primarily focussing on the build which I believe that it will aid the beginners to have enough motivation to startup their work. If you require the understand the functioning of the circuit the same can be studied from the original source and reputed forums on net elsewhere. Links can be found below.
The PCB has been designed with "Diptrace" which is free of cost and very easy to use for beginners, with good standard library of componenets and one can easily draw schematics as well as PCBs with this software. The software is limited but if you want you can buy the full version. Still the free version does all the job.
The PCB therefore is a home brewed one which is fabricated using the toner transfer method.
Frequency Bands of my version:-
Low pass: 110Hz and below
Low Band Pass: 110Hz to 284Hz
Mid Band Pass: 284Hz to 2840Hz
High Pass: 2840Hz and above
Circuit diagram: The same can be found at the link as below:-
4-Way Linkwitz-Riley Crossover
PCB
All resistors used are 1% metal film resistors and matched for each section along with the capacitors.
For the Opamps have used TL072 which does the job very well, this can be used for Filter section but for buffer section, it's better to use NE5532. Depending upon ones liking different Opamps can be used, even the most expensive ones from Burr Brown. Choice is entirely yours.
For testing purpose Screw terminals has been used but when final integration is done it's better to solder the wires directly to the board for better performance and overall lower noise levels.
For builders who wants to build this without matching componenets can ofcourse go for it without any issues.
For my design have used the below combination of RC for the targeted frequency bands, If you want to go for these bands you can follow the values in your design. Or if you want to calculate your own values it can be done by taking the help of the calculator form ESP site.
