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bitrex
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On 7/24/2020 6:16 PM, John Larkin wrote:
Seems he quit sometime in his late 30s, early 40s maybe? Unfortunately
the effects of 20-25 years of alcoholism don\'t reverse themselves
overnight, if ever. It\'s a sad story in anyone, particularly in creative
types. Some give it up and feel they lost whatever it was that made them
creative, and some never do. The author William Styron wrote about it:
<https://en.wikipedia.org/wiki/Darkness_Visible_(memoir)>
Alcohol abuse induces paranoia...hard to imagine anyone could design
while drunk but maybe he only worked during sober periods. Or he was
just that good.
On Fri, 24 Jul 2020 17:24:38 -0400, bitrex <user@example.net> wrote:
On 7/24/2020 4:53 PM, John Larkin wrote:
On Fri, 24 Jul 2020 19:37:41 -0400, bitrex <user@example.net> wrote:
On 7/24/2020 2:46 PM, Phil Hobbs wrote:
On 2020-07-24 14:16, John Larkin wrote:
On Thu, 23 Jul 2020 21:29:40 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
On 2020-07-23 20:28, Lasse Langwadt Christensen wrote:
fredag den 24. juli 2020 kl. 02.14.39 UTC+2 skrev bitrex:
On 7/23/2020 7:47 PM, Lasse Langwadt Christensen wrote:
fredag den 24. juli 2020 kl. 01.12.21 UTC+2 skrev bitrex:
On 7/23/2020 7:01 PM, Lasse Langwadt Christensen wrote:
torsdag den 23. juli 2020 kl. 20.15.24 UTC+2 skrev Phil Hobbs:
ON still lists the TCA0372 power op amp as active, but total
distributor
stock is less than 1k pieces and the quoted lead time is 6-1/2
months!
Here I\'m trying to hang a couple of ADA4817s off a 20-V rail,
and my
go-to floating ground generator is getting scarce.
razzafrazza%$&@!!
for 20V wouldn\'t this be an alternative?
https://www.st.com/resource/en/datasheet/l2720w.pdf
Looks good but they seem a bit un-confident about the offset voltage
spec...???? it\'s usually somewhere in there
page5: input offset voltage -/+10mV ?
Right. The TCA0372 lists 1mV typ and 15 mV max, when there\'s a wide
spread there I get the impression that the 15mV parts are the real
outlier and don\'t show up much in practice. You could use them for DC
application and expect better and QC out a few boards that got a real
bad one.
When it\'s just -/+10 mV with no typ I get the impression that it\'s all
over the place from device to device, so might not be the best
choice of
part for a DC-coupled application with gain.
But interpreting datasheets can be mysterious, I\'d guess the TCA would
not be so popular if it were giving offsets at the far end
routinely though.
but max might happen, less than 10mV is better than usually 1mV
occupationally 15mV, you have to design for it unless you want to
start sorting
Beasts like that are (IME) used for things like driving servomotors or
making floating ground/supply rails (my usual application). The motors
are inside some outer FB loop, and nobody cares about a 15-mV offset on
a supply rail.
For the occasional precision application, wrap a chopamp feedback loop
round it.
Or just calibrate out the offset.
Sure, if it sits still. I\'d expect it to walk around a bit, what with
being a power op amp and all. (Widlar put a paper in the ISSC one
year that purported to prove that monolithic voltage regulators with
on-chip pass transistors were impossible due to thermal feedback.
Everybody believed it because it was Widlar. Then he came out with the
LM109/309.)
Cheers
Phil Hobbs
Maybe Widlar believed it too for a while, hard to say. I get the
impression a lot of his designs didn\'t immediately work as expected
which is why he carried a sledge hammer I feel the same way sometimes.
I expect they were mostly named after whomever the sexiest secretaries
in the National office was as was the fashion at the time. Aw crap, the
Lauren didn\'t pan out. To the crushing-stump with it.
We met his girlfriend at the bar of the Washington Square Bar and
Grille. I can\'t remember her name.
Seems like the kind of guy who had more than one girl friend. Like Feynman
She was living with him in Puerta Viallarta (sp?) and back visiting
her mom. She was worried about his drinking.
Seems he quit sometime in his late 30s, early 40s maybe? Unfortunately
the effects of 20-25 years of alcoholism don\'t reverse themselves
overnight, if ever. It\'s a sad story in anyone, particularly in creative
types. Some give it up and feel they lost whatever it was that made them
creative, and some never do. The author William Styron wrote about it:
<https://en.wikipedia.org/wiki/Darkness_Visible_(memoir)>
Alcohol abuse induces paranoia...hard to imagine anyone could design
while drunk but maybe he only worked during sober periods. Or he was
just that good.