Ok, not much then.
You claimed that you know about the effects of "n" series'd opamps.
What do you know?
It's fine to state your beliefs, but I'm looking for real information.
You ought to know that I am not in the "measurements tell all" camp nor the "measurements are not important" camp.
_-_-
You claimed that you know about the effects of "n" series'd opamps.
What do you know?
It's fine to state your beliefs, but I'm looking for real information.
You ought to know that I am not in the "measurements tell all" camp nor the "measurements are not important" camp.
_-_-
I can count on you George, but even you can't get the directors cut since it's behind our firewall. 😀 This was the best end of career experience that anyone could ever hope for.
Scott, congrats, much better than the gold watch.
Are these AD797's the same as the ones you can buy commercially, or are there testing protocols to select the cream of the crop?
Are these AD797's the same as the ones you can buy commercially, or are there testing protocols to select the cream of the crop?
Already told you. It's audible. But why do you care? You're not going to build it, so what's its importance to you?
No they buy right from the distributors. They only use 8 per site so they could select but no one mentioned it.
I think you deserve it. Congratulations Scott and my wishes for a happy and healthy post retirement life.
PS Can you tell us please which are the op amps (and INAs) you have designed?
George
That will take a while, I've forgotten some of the lesser ones though last count was upwards of $800,000,000 total.
Geez man, you don't quit.
Audible?
Really?
How many of which opamp in series?
You have no idea what I will or will not do. So why make continuing baseless assertions?? A small % of what I have actually built is on my now antique website.
Let's see what you've built. How about it?
Humble me, and us.
Let's see your system, the one that you use as a point of reference?
I'll not hold my breath waiting for you to provide any substantiation, because it seems Kirchoff that your entire raison d'etre revolves around poking people and making assertions. Show otherwise.
_-_-
In the LIGO article:
"While the original output of the laser is standard, it quickly builds up to kilowatts within the resonant cavities of the arms. This can actually create a force sufficient to form acoustic resonances in the glass mirrors, so LIGO uses an ADA4700 high-voltage op amp to drive electrostatic actuators that actively damp the mirrors and keep them in alignment."
I'm really puzzled by this.
First, it's in an ultra high vacuum?
Which is one heck of a trick given that it has to travel several miles before it bounces back? Perhaps I did not understand the actual physical situation?
So, how is there anything "acoustical"?
Then, they're moving a mirror that has to respond at some (apparently) sub-wavelength distance and (I guess) nanosecond speed by electrostatic means?
Seems like some very sophisticated methods, but puzzling none-the-less.
_-_-
"While the original output of the laser is standard, it quickly builds up to kilowatts within the resonant cavities of the arms. This can actually create a force sufficient to form acoustic resonances in the glass mirrors, so LIGO uses an ADA4700 high-voltage op amp to drive electrostatic actuators that actively damp the mirrors and keep them in alignment."
I'm really puzzled by this.
First, it's in an ultra high vacuum?
Which is one heck of a trick given that it has to travel several miles before it bounces back? Perhaps I did not understand the actual physical situation?
So, how is there anything "acoustical"?
Then, they're moving a mirror that has to respond at some (apparently) sub-wavelength distance and (I guess) nanosecond speed by electrostatic means?
Seems like some very sophisticated methods, but puzzling none-the-less.
_-_-
Short memory, Bear? I was one of the few that answered your questions about "my system". Except that time you asked nicely. Now you're trying to prod me. It won't work. I'm very difficult to bully.
The mirrors respond to the photon pressure and this happens to be at frequencies in the audio bandwidth simply due to the dimensions and physical properties of the mirrors.
Bear, if you were my next door neighbor I would love to sit down and talk about this stuff with you.
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Don't fancy yourself, under the current forum rules, everybody is. Otherwise you won't stand a chance, trust me.
The captured audio signal is the conjugate of the acoustic event, and noises.
These noises are not random, and constitute information including time stamp.
These embedded noises are changeable at will.
Dan.
Nice way to be vindicated, really nice, sincere congrats and kudos.
Soon set free into retirement you can go have some new fun, enjoy it all.
Dan.
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I'm afraid it's time to share some tangible results, I'd love to see what your up to.
I've invited you before - send me an email... more things are possible privately than on here.
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And another thing wrong with opamps! When you blow one up you can't open it up to see what is wrong. On a discrete circuit you can troubleshoot it and repair it. In the process you usually learn something.
My first venture with opamps were with 709s in a power supply. The voltage was set by switched redistors. If the switch opened during switching it lost feedback. This caused the output voltage to spike and blew out the inputs to the 709. The designer did not have current limiting resistors instead he counted on a make before break rotary switch.
The 709s were $45 each in the local distributor's catalog. But counter price came down to $9 each. Poly Packs had them for $1.
I don't want to even remember how many I went through before locating the problem.
Still have the now working power supply on my bench today after 48 years.
My first venture with opamps were with 709s in a power supply. The voltage was set by switched redistors. If the switch opened during switching it lost feedback. This caused the output voltage to spike and blew out the inputs to the 709. The designer did not have current limiting resistors instead he counted on a make before break rotary switch.
The 709s were $45 each in the local distributor's catalog. But counter price came down to $9 each. Poly Packs had them for $1.
I don't want to even remember how many I went through before locating the problem.
Still have the now working power supply on my bench today after 48 years.
You're not blowing it up right then. Do a good job and the missing lump of plastic where the magic smoke escaped will be very visible. Then you will know which device blew up 🙂 Extra point if the whole package has exploded and you are just left with the legs and a bit of the lead frame.
Thanks for the tip. 🙁 Back then these were metal cans. He 709 arrived in 1965 and I finished the power supply in 1968.
Years later I learned the fixed resistors in the voltage selector switches had some that were off by more than 10%! But once working a regulated voltage source with current limiting saved far more circuits from destruction. Even in college it was better than the lab power supplies.
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