Negative Feedback in Audio Amplifiers

Feb 02, 2013 72 Replies

More than a century has passed since science laid down sound propositions as to the origins of the universe, but how many have mastered them or possess the really scientific spirit of criticism? A few thousands at the outside, who are lost in the midst of hundreds of millions still steeped in prejudices and superstitions worthy of savages, who are consequently ever ready to serve as puppets for religious impostors. -- Peter Kropotkin

Cool. What is the origin of the universe?

John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

You need that passive filtering to keep RF out of the amplifier as well.

Evidently you don't understand the limitations of closed systems. There may be no way of discovering how existence and the Universe came about. I recommend you should not ask that question since the answer is unknowable. If you want to believe in "God" that's fine, but you will have to live with the fact the designation is nothing more than a substitute for real knowledge.

If you mean 'origin' in a Cartesian sense, I can only say that your suggestion of omniscience is misplaced.

Regards,

Uncle Steve

More than a century has passed since science laid down sound propositions as to the origins of the universe, but how many have mastered them or possess the really scientific spirit of criticism? A few thousands at the outside, who are lost in the midst of hundreds of millions still steeped in prejudices and superstitions worthy of savages, who are consequently ever ready to serve as puppets for religious impostors. -- Peter Kropotkin

Talk about pissing it away.

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sound pressure is proportional to cone acceleration, with a laser you'd get position or possibly speed, you'd need to differentiate to get acceleration that is potentially noisy

with a piezo you get acceleration directly and only need integration to get to speed and position

-Lasse

Our universe? Cavitation.

Well, so much for science.

John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

I think we resulted from a high school science experiment in some other universe.

John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

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I was thinking that the laser option would put less mass on the cone, which would perturb the system less. I'm not familiar with the electrical characteristics of pezioelectric sensors, but I would not be surprised if a small weight would have to be set on the pezio to give it a reasonable dynamic range; those things are not very heavy to start with. Besides, lasers are cool.

Regards,

Uncle Steve

More than a century has passed since science laid down sound propositions as to the origins of the universe, but how many have mastered them or possess the really scientific spirit of criticism? A few thousands at the outside, who are lost in the midst of hundreds of millions still steeped in prejudices and superstitions worthy of savages, who are consequently ever ready to serve as puppets for religious impostors. -- Peter Kropotkin

Seems to work well enough, and certainly it is much more accurate than religious belief.

Regards,

Uncle Steve

More than a century has passed since science laid down sound propositions as to the origins of the universe, but how many have mastered them or possess the really scientific spirit of criticism? A few thousands at the outside, who are lost in the midst of hundreds of millions still steeped in prejudices and superstitions worthy of savages, who are consequently ever ready to serve as puppets for religious impostors. -- Peter Kropotkin

Big Grin... George H.

ed text -

though

full

If only you would take your sig to heart.

?=/

Bawg, i do detest the Gbit/s Ethernet being used way stupidly as a panacea buzz word. Does nobody understand that Ethernet has uncontrolled latency? Packets may arrive out of order? For snot sake if you want to ship digitized audio (or video for that matter) data fast with controlled latency and guaranteed in order reception use D1 or any of several SMPTE Standard protocols.

[still boiling mad]

?-)

Please don't mix (or mistake of conflate) apples and tarantulas.

?-)

josephkk a écrit :

Hey, that'll put some 'spread spectrum-ness' into the FB loop. (another nice buzz word that'll magically save the world) Or better, if you push to the limit, you'll get to 'fractal feed-back' (tm), which obviously is the ultimate in 'distortion dithering' (tm) and BSOAR (BullShit Optimized Audio Reproduction).

Thanks, Fred.
[snip]

I like that, "BSOAR" >:-} ...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 | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

It'll never replace FUBAR

Yeah, that's the kind of bullshit that soars above the audio fields, with two expectations:

- first, tickle some of your hot spots

- second break down any rationality

Thanks, Fred.

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