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8 years ago
-- It's easy to name-call, but much harder to make one's case using logic and reason, so why don't you show us (schematic, please) how you'd accomplish all of his goals your way?
Square root circuit
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8 years ago
--
"Schamatic"??? Perhaps the 'h' is superfluous... ;)
I know you live for wiggle room, but just to try to nail things
down, is this what you have in mind?:
6.95V
|V1
|
O1
| 2
[R1] V2 TO IC1-10
|5k |
O3 |
| |
| |
O1 |
| 2 |
[R2]
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8 years ago
On Thu, 02 Jul 2015 17:34:46 -0700, John Larkin Gave us:
I thought you said that you worked in electronics.
What that little bit of math too much for you?
You are always spouting this diatribe.
And the spelling! Horrendous!
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8 years ago
On Wed, 1 Jul 2015 07:16:47 -0700 (PDT), George Herold Gave us:
The trick is the closely matched pair in Q3 and Q4
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8 years ago
You got it.
Whatever coarse/fine ratio you want. Ask in sci.electronics.basics if you need help.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
It's not too bad with 3 or 4 breakpoints. Use one op-amp per diode, so maybe a quad or a quad + 1 plus some (6 or 8) funny value resistors and a few 10Ks.
Main (design) thing is to decide what a realistic minimum output power requirement is (say 10% or 20% of full power). The slope of sqrt(x) is infinite at zero, so you could waste a lot of parts dealing with low power levels that will not realistically be used.
We used to do this sort of thing quite a bit back before microcontrollers. FWIW, I think you could do this a lot better in a few-dollar Arduino with a few lines of code (use the PWM for the DAC).
-- Best regards, Spehro Pefhany Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8 Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
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8 years ago
Proprietary.
formatting link
We did the cryo temp and helium level sensors for the SSC helium plant in Waxahachie [1] and the CEBAF accelarator in Newport News. The diode sensors are scanned to save parts and reduce self-heating. CEBAF temps go below 2K, with the diode drops around 3 volts or something like that.
[1] It was the world's biggest helium liquefaction plant, and I guess it's still there.-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
-- Painted yourself into a corner, have you? What a surprise! John Fields
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8 years ago
-- A little too close for comfort, huh? Oh, well, no surprise there...
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8 years ago
You have refused to describe your projects recently, with some original observation about lips and ships.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
On Fri, 03 Jul 2015 10:34:42 -0500, John Fields Gave us:
You should not have revealed that observation. Now he'll "go off" over it.
We'll never see the "schamatic" now, which shouldn't take an engineer of "his caliber" more than twenty minutes to put together. Right? ;-)
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8 years ago
On Fri, 03 Jul 2015 09:01:07 -0700, John Larkin Gave us:
His security reservations were, however, factual.
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8 years ago
And you know this how?
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8 years ago
Are you referring to the fact that this circuit can't reach either of the rails?
-- Rick
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8 years ago
How could we ever know? He says his work is pro-bono, so it's not National Security stuff.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
On Fri, 03 Jul 2015 11:36:48 -0500, John S Gave us:
He was working on a mil contract, and it was before 'mil spec' got dumped. Pretty much common sense.
Also, he mentioned it.
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8 years ago
On Fri, 03 Jul 2015 10:08:33 -0700, John Larkin Gave us:
That project was decades ago, but I do not expect you to ever note details properly.
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8 years ago
Since you seem to be in short supply of that, I remain skeptical for good reason.
Where? And don't tell me to look it up. It is *your* assertion.
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8 years ago
I specifically asked him about recent projects. Maybe he has none.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
On Fri, 03 Jul 2015 12:22:20 -0500, John S Gave us:
Did you look at the photo links he provided? (the reference was a long time ago, and JL knew what was referenced.. So what is your problem, child?)
He also described the work in that very post.
You lose... again.
Only cursory glance idiots like you miss the details of any given circumstance. It is a primary part of your character (lack thereof, that is).