Did anyone ever tried the reconstruction filter described in the chapter 5 of this book ? (the book is available for download here : http://www.analog.com/library/analogDialogue/archives/39-05/op_amp_applications_handbook.html )
It is on page 5.126. It is a 7th order filter, using 6opamps/channel, in a shunt configuration. Does this topology offer so much advantages it is worth the time and money to do it ?
It is on page 5.126. It is a 7th order filter, using 6opamps/channel, in a shunt configuration. Does this topology offer so much advantages it is worth the time and money to do it ?
I have asked myself the same question. If you search for FDNR you will find some more.
In theory most filters are the same but not in real life. Bob Pease has made a good webcast show at National.com about active fiters. He shows how different topologies behave.
In litterature there are not much about the "fidelity" of different kind of filters.
In theory most filters are the same but not in real life. Bob Pease has made a good webcast show at National.com about active fiters. He shows how different topologies behave.
In litterature there are not much about the "fidelity" of different kind of filters.
hi,
I had tried two type of LC steep filters with freq equalizer for TDA1541 NOS DAC...one is 5 pole 2 zero elliptic filter,another is 8 pole,3 zero elliptic filter.... the sound is much much better than before.
the post which I analyse the NOS DAC in Chinese is on here.
http://www.hifidiy.net/dispbbs.asp?boardID=2&ID=12780&skin=0
my TDA1541 NOS DAC with steep LPF VS krell SBP-32X DAC
http://www.diyaudio.com/forums/showthread.php?s=&threadid=67377
the I/V sch of my TDA1541 NOS DAC before I optimised ,which LPF is 8 pole,3 zero elliptic filter
the respone of my 5 pole 2 zero elliptic filter
I had tried two type of LC steep filters with freq equalizer for TDA1541 NOS DAC...one is 5 pole 2 zero elliptic filter,another is 8 pole,3 zero elliptic filter.... the sound is much much better than before.
the post which I analyse the NOS DAC in Chinese is on here.
http://www.hifidiy.net/dispbbs.asp?boardID=2&ID=12780&skin=0
my TDA1541 NOS DAC with steep LPF VS krell SBP-32X DAC
http://www.diyaudio.com/forums/showthread.php?s=&threadid=67377
An externally hosted image should be here but it was not working when we last tested it.
the I/V sch of my TDA1541 NOS DAC before I optimised ,which LPF is 8 pole,3 zero elliptic filter
An externally hosted image should be here but it was not working when we last tested it.
the respone of my 5 pole 2 zero elliptic filter
An externally hosted image should be here but it was not working when we last tested it.
Your sig is right on target 
but when it comes to me, I can say this much that I'm not dissapointed with my things but I'm sure someone find them as "bad". Compare how my SMD Gainclone got tweaked unheard and the result was amazing... unheard. This confirms your claims
There are two different things:
1 Be pleased with your results
2 Know what you have achieved compared to other designs, seen from the objective perstective.
but when it comes to me, I can say this much that I'm not dissapointed with my things but I'm sure someone find them as "bad". Compare how my SMD Gainclone got tweaked unheard and the result was amazing... unheard. This confirms your claims There are two different things:
1 Be pleased with your results
2 Know what you have achieved compared to other designs, seen from the objective perstective.
peranders said:Your sig is right on target
There are two different things:
1 Be pleased with your results
2 Know what you have achieved compared to other designs, seen from the objective perstective.
I need to come out now: 90% of my pleasure in diy audio is completing an interesting - from an engineering pov - design that was difficult and something not normally done. And yes, of course, it always sounds great!
Jan Didden
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