John Curl's Blowtorch preamplifier part II - Page 2

BV · 29th June 2009, 07:42 PM

OK, here is "grass"

john curl · 29th June 2009, 07:45 PM

Never up, never in, CV. You have to try harder to FIND distortion.

Netlist · 29th June 2009, 07:49 PM

Quote:

Originally posted by Professor smith

Can someone be kind enough toi explain what PIM and FM is?

I admit I don't know what PIM is either but I googled Passive Intermodulation Distortion. Not sure this is our PIM though...
FM is most likely Frequency Modulation in this thread.

BV · 29th June 2009, 07:49 PM

Maybee so?
Spectra multitone..

PMA · 29th June 2009, 08:01 PM

Quote:

Originally posted by john curl
I hate to quibble, CV, but a 2-3dB difference between 15KHz and 15.7KHz with a 100K -3dB down point?

I assume he has generated the signal in digital domain, and used Lynx L22 DAC output.

Anyway, speaking about grass, I mean dynamic range of 140 - 160dB. I know it is inaudible at sine. But the high order grass is an indicator of certain type of sound. Multitone with to many tones confuses the issue, 19+20kHz is okay.

BV · 29th June 2009, 08:24 PM

Quote:

I mean dynamic range of 140 - 160dB. I know it is inaudible at sine. But the high order grass is an indicator of certain type of sound.

You can hear harmonics 140-160dB under fundamental?

john curl · 29th June 2009, 08:28 PM

Everyone, and anyone who wants to know about the BLOWTORCH principles, limitations and costs, just look at the first 100 pages of the previous Blowtorch thread. Everything else, don't count on it, even though there are a few nuggets of wisdom, interspersed throughout.

john curl · 29th June 2009, 08:43 PM

Walt's previous paper on the other thread should be transfered over here, PMA, if possible. Very good paper, especially if you KNOW what to look for.

FrankWW · 29th June 2009, 08:49 PM

This one?

http://waltjung.org/PDFs/SID_TIM_TAA77_P3.pdf

PMA · 29th June 2009, 08:58 PM

Walt's paper on Slewing Induced Distortion:

http://waltjung.org/PDFs/SID_TIM_TAA77_P3.pdf

Very good one, indeed.

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29th June 2009, 07:45 PM	#12
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Never up, never in, CV. You have to try harder to FIND distortion.

29th June 2009, 08:28 PM	#17
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Everyone, and anyone who wants to know about the BLOWTORCH principles, limitations and costs, just look at the first 100 pages of the previous Blowtorch thread. Everything else, don't count on it, even though there are a few nuggets of wisdom, interspersed throughout.

29th June 2009, 08:43 PM	#18
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Walt's previous paper on the other thread should be transfered over here, PMA, if possible. Very good paper, especially if you KNOW what to look for.

29th June 2009, 08:49 PM	#19
FrankWW diyAudio Member Join Date: Jul 2004 Location: n/a	This one? http://waltjung.org/PDFs/SID_TIM_TAA77_P3.pdf

29th June 2009, 08:58 PM	#20
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Walt's paper on Slewing Induced Distortion: http://waltjung.org/PDFs/SID_TIM_TAA77_P3.pdf Very good one, indeed.

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