On Tue, 22 May 2012 18:38:48 +0100, "Gareth Magennis"
wrote:



Audio designs are so bizarre. What's with the diode quad in the U1A
feedback path?


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

On Wed, 23 May 2012 08:42:40 -0700, John Larkin
wrote:

On Tue, 22 May 2012 18:38:48 +0100, "Gareth Magennis"
wrote:



Audio designs are so bizarre. What's with the diode quad in the U1A
feedback path?

It's like the human appendix, a vestige left over from the past, no
longer useful, but still dangling there. My guess is the "designer"
simply popped in FET's Q16, and Q21, replacing an NPN and a PNP
respectively.

I get a kick out of such crap "designs"... some slug heard that FET's
would be better, so that's what you get... crap with FET's ;-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On 2012-05-23, John Larkin wrote:
On Tue, 22 May 2012 18:38:48 +0100, "Gareth Magennis"
wrote:



Audio designs are so bizarre. What's with the diode quad in the U1A
feedback path?

Looks like it enforces clipping, perhaps because U3 is too slow to
respond immediately to clicks.

I suspect most of the time feedback is only via R7,R72

--
š‚šƒ 100% natural

On Wed, 23 May 2012 09:26:44 -0700, Jim Thompson
wrote:

On Wed, 23 May 2012 08:42:40 -0700, John Larkin
wrote:

On Tue, 22 May 2012 18:38:48 +0100, "Gareth Magennis"
wrote:



Audio designs are so bizarre. What's with the diode quad in the U1A
feedback path?

It's like the human appendix, a vestige left over from the past, no
longer useful, but still dangling there. My guess is the "designer"
simply popped in FET's Q16, and Q21, replacing an NPN and a PNP
respectively.

I get a kick out of such crap "designs"... some slug heard that FET's
would be better, so that's what you get... crap with FET's ;-)

...Jim Thompson

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?


--
You can't have a sense of humor, if you have no sense.

On Thu, 24 May 2012 14:32:55 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?

I have no idea... I don't recognize that name at all.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Jim Thompson wrote:

On Thu, 24 May 2012 14:32:55 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?

I have no idea... I don't recognize that name at all.


Annoying British guy named Graham that hated America. In one post he
stated that the entire US shout be nuked into a sheet of glass. He was
also whining that young girls he thought were flirting with him ended up
treated him like their grandfather.


--
You can't have a sense of humor, if you have no sense.

On Fri, 01 Jun 2012 19:34:10 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

On Thu, 24 May 2012 14:32:55 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?

I have no idea... I don't recognize that name at all.


Annoying British guy named Graham that hated America. In one post he
stated that the entire US shout be nuked into a sheet of glass. He was
also whining that young girls he thought were flirting with him ended up
treated him like their grandfather.

I've had that problem since my early '40's. Female employees
approaching me to discuss their personal problems with a "father
figure" :-(

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Jim Thompson wrote:

On Fri, 01 Jun 2012 19:34:10 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

On Thu, 24 May 2012 14:32:55 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?

I have no idea... I don't recognize that name at all.


Annoying British guy named Graham that hated America. In one post he
stated that the entire US shout be nuked into a sheet of glass. He was
also whining that young girls he thought were flirting with him ended up
treated him like their grandfather.

I've had that problem since my early '40's. Female employees
approaching me to discuss their personal problems with a "father
figure" :-(


Remember the Official Rules.

http://tinyurl.com/cbbgns9

Related to these is the Prime Directive: "Never eat anything bigger than
your head."

Cheers

Phil Hobbs

On Sat, 02 Jun 2012 13:44:24 -0400, Phil Hobbs
wrote:

Jim Thompson wrote:

On Fri, 01 Jun 2012 19:34:10 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

On Thu, 24 May 2012 14:32:55 -0400, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

Oooops! Wrong "quad". My comments apply to D27 and "south".

Maybe D15, et al, are to produce some of that "toooob" sound ?:-)


Isn't 'Allen and Heath' the company that EEyore used to brag about?

I have no idea... I don't recognize that name at all.


Annoying British guy named Graham that hated America. In one post he
stated that the entire US shout be nuked into a sheet of glass. He was
also whining that young girls he thought were flirting with him ended up
treated him like their grandfather.

I've had that problem since my early '40's. Female employees
approaching me to discuss their personal problems with a "father
figure" :-(


Remember the Official Rules.

http://tinyurl.com/cbbgns9

Related to these is the Prime Directive: "Never eat anything bigger than
your head."

Cheers

Phil Hobbs

Yep. I once got stuck in a week-long HR (GenRad) seminar on sexual
harassment. When I allowed as how I wished some babe would sexually
harass me, the HR woman was _not_ amused ;-)

Those GenRad HR meetings were nasty... they wouldn't even let us leave
the building for lunch... I guess for fear we'd "sedate" ourselves.

I once drew their serious ire... I hosted a pre-Thanksgiving luncheon
for my whole department... my wife brought turkey and all the fixin's,
and wine and beer iced in wash tubs... all set up in the lab.

HR went ballistic and threatening. I responded, "So fire me... I'll
just go down the street".

Bob Fulks (OmniComp President and VP of GenRad-Phoenix Operations)
interceded and they STFU.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Jim Thompson wrote:

I've had that problem since my early '40's. Female employees
approaching me to discuss their personal problems with a "father
figure" :-(


Such is life.


--
You can't have a sense of humor, if you have no sense.

Phil Hobbs wrote:

Related to these is the Prime Directive: "Never eat anything bigger than
your head."


No one ever told my dog. He once ate a bone that was bigger than his
body, even though it took him a month.


--
You can't have a sense of humor, if you have no sense.

Fred Abse wrote:

On Mon, 04 Jun 2012 18:40:34 -0400, Michael A. Terrell wrote:

No one ever told my dog. He once ate a bone that was bigger than his
body, even though it took him a month.

Are the Smithsonian still looking for it?

;-)


No. The 'Statute of Limitation' ran out sometime in the '80s.


--
You can't have a sense of humor, if you have no sense.