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Old 14th October 2003, 09:28 PM   #11
Asen is offline Asen  Bulgaria
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QUAD control units are really VERY good. I guarantee for this even knowing that they use chip multiplexors instead of relays at the input and the rest of the circuitry. I would recommend McIntosh preamps too. C22 pre has very good controls in case you like tubes.
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Old 15th October 2003, 01:31 AM   #12
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Quote:
Originally posted by Nelson Pass
It will amuse you to consider that Tom Holman got
his chops patenting a tone control circuit, which I
can recommend.
Hi Nelson,
Do you have any references to this patent ?.

Thanks,
Eric.
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Old 15th October 2003, 10:11 AM   #13
vytas is offline vytas  Lithuania
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Default I think I will stay with this problelm for mor 1 year

According your sugestions I found one interesting site, here it is:

http://www.one-electron.com/FC_Consumer.html


Now I proceed my idea again…
Thank you.
schematics
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Old 15th October 2003, 02:40 PM   #14
ergo is offline ergo  Estonia
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Nelson, can you please shed some more light of where to look for the mentioned Tom Holman patent.

All I found by searching is

PAT. NO. Title
1 6,405,286 Method and apparatus for determining interleaving schemes in a computer system that supports multiple interleaving schemes
2 6,272,594 Method and apparatus for determining interleaving schemes in a computer system that supports multiple interleaving schemes
3 6,108,745 Fast and compact address bit routing scheme that supports various DRAM bank sizes and multiple interleaving schemes
4 6,070,227 Main memory bank indexing scheme that optimizes consecutive page hits by linking main memory bank address organization to cache memory address organization

but none of those are of any relevance....

Ergo

PS. Tom Holman company's site is
http://www.tmhlabs.com/main/mainmenu.html
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Old 15th October 2003, 09:06 PM   #15
Steven is offline Steven  Netherlands
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I guess you should not search for Tom Holman but for Tomlinson Holman (Advent Corporation, and later Lucasfilm), then you get patents like
5,222,059
5,189,703
5,043,970
4,569,076
4,117,412
4,032,855
Although some of these show some tone control, it seems not to be what was meant .

Steven
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Old 15th October 2003, 09:54 PM   #16
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well, maybe I'm wrong.
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Old 15th October 2003, 09:58 PM   #17
mlloyd1 is offline mlloyd1  United States
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My first reply to myself (I think).

I guess I didn't actually post the schematic here, I had a link to the schematic and some text. So, here's the link:

APT Preamp Tone Control

txt file is the message that goes along with the schematic, which is the gif file.

have fun ....

I'd tell you the patent number, but all my papers are packed up in storage.

mlloyd1

And my first reply to a reply: here is the patent info:
#4,220,817 by Frank S. Kampmann (not Holman himself; and Mark Dinsmore was the designer for the power amp)


Quote:
Originally posted by mlloyd1
I know you said "passive". However, I'd urge you to consider the active, "baxendall-like" tone control design featured in the Apt preamp from some years ago. I posted the relevant parts of the schematic some time ago (a search should find it here and a patent search should find it elsewhere - it was patented. I'd post it again but my stuff is all packed up). A key point was that it added a unity gain buffer to minimize interaction in mid band. The buffer also made the math easier - when I was younger, I liked deriving the equations for all kinds of filters and comparing the results to various simulators we used to play with. I liked the Apt preamp for it's day and I built versions of the tone control for some of my earlier preamps which are still serving friends well.

Of course, now I don't use tone controls at all, but that's another story for another day.

mlloyd1
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Old 15th October 2003, 10:03 PM   #18
mlloyd1 is offline mlloyd1  United States
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No Nelson, you're not wrong, just didn't completely all the names on the patent app, I think!

mlloyd1
who is smiling now, he doesn't feel so bad about his poor memory anymore!

Am I the only one who misses halojoy?

Quote:
Originally posted by Nelson Pass
well, maybe I'm wrong.
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Old 16th October 2003, 05:16 AM   #19
dimitri is offline dimitri  United States
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Default Holman and Kampmann

Dear mlloyd1,
that tone control was published in Tomlinson Holman and Frank Kampmann paper "Loudness Compensation: Use and Abuse" AES 1978, July
They used extra follower Q1, thus prevent interaction between treble and bass controls completely
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Old 15th January 2006, 08:59 PM   #20
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Quote:
Originally posted by EchoWars
How about this: http://www.angelfire.com/electronic/.../Amp-Tone.html
Passive setup...


"Amplifiers would be nothing without tone controls. They allow us to boost or cut the low and high ends of the audio spectrum. Nobody would buy an amplifier or preamp that did not have them"

hmm...
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