ZV7T : how to make distortion analyzer?

lumanauw · 11th March 2004, 01:13 AM

The latest Zen is Zen ver 7, common inductance loading. Mr. Pass said that this amp cannot be trimmed by matching voltage or matching current, it has to be done with distortion analyzer.
He said that we can also built (if cannot buy one), like the IM analyzer (Audio Express).
Does anyone has copy of that article? Or have other DIY distortion meter that can be used for trimming this amp?

lumanauw · 13th March 2004, 03:39 AM

Mr. Pass said something about notch filter. What is notch filter, and how can it be used to tune ZV7?

Michael Rothacher · 13th March 2004, 03:51 AM

A notch filter is tuned to filter out the fundamental frequency of interest so that what you're left with is harmonic distortion and noise. You could observe the filtered signal on an oscilloscope or use an audio voltmeter.

You can construct a notch filter of your own.

Try:

www.sound.westhost.com

Nelson Pass · 13th March 2004, 05:20 AM

OK Fred, here's your opportunity to play educator. I know you
can do it for us.

Lacking that, build one - there's enough information out there,
and it doesn't have to be particularly good. 1% scale will serve.

Michael Rothacher · 13th March 2004, 04:34 PM

NP, Fred: I hope my desciption was accurate. I'm working on a "Poor Guy's" Audio Precision test rig. It's a hardware / software design. Would you guys be willing to critique the design of a fledgling like me? Maybe even compare it to the real thing? (NP - I know you keep one at you bedside!)

Thanks

Mike

banana · 13th March 2004, 05:05 PM

Rightmark Audio Analyzer

Have been playing with it recently. It's free and it's interesting.

It has been suggested in this forum before. But I still would like to hear more commend about it. Any more RMAA users here?

Nelson Pass · 13th March 2004, 05:07 PM

Quote:

Originally posted by mrothacher
NP, Fred: I hope my desciption was accurate. I'm working on a "Poor Guy's" Audio Precision test rig

Poor is what you are after shelling out for an AP.

lumanauw · 14th March 2004, 02:18 AM

Still from the same paper, what is IM analyzer (featuring in Audio Express)? Is this a device to display harmonics?

How do Mr. Pass get this picture? I've always wanted to see harmonics (more than measuring it). Many people in this website can view 2nd, 3rd,even, odd, etc harmonic. How can I do that?

Michael Rothacher · 14th March 2004, 02:20 AM

If you want to see individual harmoncs, an FFT analyzer is the best route.

lumanauw · 14th March 2004, 10:30 AM

Again, sorry about this. What is FFT analyzer? Can it be made DIY or have to buy it?

11th March 2004, 01:13 AM	#1
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	ZV7T : how to make distortion analyzer? The latest Zen is Zen ver 7, common inductance loading. Mr. Pass said that this amp cannot be trimmed by matching voltage or matching current, it has to be done with distortion analyzer. He said that we can also built (if cannot buy one), like the IM analyzer (Audio Express). Does anyone has copy of that article? Or have other DIY distortion meter that can be used for trimming this amp?

13th March 2004, 05:05 PM	#6
banana diyAudio Member Join Date: Feb 2003 Location: Hong Kong	How about RMAA? Rightmark Audio Analyzer Have been playing with it recently. It's free and it's interesting. It has been suggested in this forum before. But I still would like to hear more commend about it. Any more RMAA users here?

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13th March 2004, 03:39 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Mr. Pass said something about notch filter. What is notch filter, and how can it be used to tune ZV7?

13th March 2004, 03:51 AM	#3
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	A notch filter is tuned to filter out the fundamental frequency of interest so that what you're left with is harmonic distortion and noise. You could observe the filtered signal on an oscilloscope or use an audio voltmeter. You can construct a notch filter of your own. Try: www.sound.westhost.com

13th March 2004, 05:20 AM	#4
Nelson Pass The one and only Join Date: Mar 2001	OK Fred, here's your opportunity to play educator. I know you can do it for us. Lacking that, build one - there's enough information out there, and it doesn't have to be particularly good. 1% scale will serve.

13th March 2004, 04:34 PM	#5
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	NP, Fred: I hope my desciption was accurate. I'm working on a "Poor Guy's" Audio Precision test rig. It's a hardware / software design. Would you guys be willing to critique the design of a fledgling like me? Maybe even compare it to the real thing? (NP - I know you keep one at you bedside!) Thanks Mike

14th March 2004, 02:20 AM	#9
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	If you want to see individual harmoncs, an FFT analyzer is the best route.

14th March 2004, 10:30 AM	#10
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Again, sorry about this. What is FFT analyzer? Can it be made DIY or have to buy it?

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