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| Jim Thompson... |
 Posted: Wed Oct 21, 2009 3:30 pm |
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Guest
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On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs
<pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[quote]Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
...Jim Thompson
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
Cheers
Phil Hobbs
[/quote]
For a G-job... naturally  I need to detect _polarity_ of an
isolated very small current, maybe <5uA.
I was contemplating doing the "stack" approach (one tranny VCC to
NODE, second tranny NODE to GND), with NODE going into a 74HC04.
Also contemplating tying emitter-to-collector to make a 4N25 into
strictly photodiode behavior.
Speed, seconds are OK... pretty much static.
...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 http://www.analog-innovations.com | 1962 |
Cranky Old Git With Engineering Mind Faster Than a Speeding Prissy |
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| John Larkin... |
| Posted: Wed Oct 21, 2009 3:34 pm |
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On Wed, 21 Oct 2009 16:30:34 -0400, Phil Hobbs
<pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[quote]Rich Grise wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs wrote:
...
Each one is a sin against one or more of the corresponding virtues.
Lust <-- Justice, temperance
Without Lust, where would all the new little believers come from? >:-
Cheers!
Rich
I know you're kidding, but normal desire between husband and wife isn't
lust. (There can be lust even between spouses, but that's a different
matter.)
[/quote]
Is there, theologically speaking, anything wrong with lust within
marriage?
John |
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| Phil Hobbs... |
| Posted: Wed Oct 21, 2009 3:38 pm |
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Guest
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Jim Thompson wrote:
[quote]On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
...Jim Thompson
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
Cheers
Phil Hobbs
For a G-job... naturally I need to detect _polarity_ of an
isolated very small current, maybe <5uA.
I was contemplating doing the "stack" approach (one tranny VCC to
NODE, second tranny NODE to GND), with NODE going into a 74HC04.
Also contemplating tying emitter-to-collector to make a 4N25 into
strictly photodiode behavior.
Speed, seconds are OK... pretty much static.
...Jim Thompson
[/quote]
That's down in the toe region for some LEDs at least.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net |
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| Phil Hobbs... |
| Posted: Wed Oct 21, 2009 3:49 pm |
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Guest
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John Larkin wrote:
[quote]On Wed, 21 Oct 2009 16:30:34 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
Rich Grise wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs wrote:
...
Each one is a sin against one or more of the corresponding virtues.
Lust <-- Justice, temperance
Without Lust, where would all the new little believers come from? >:-
Cheers!
Rich
I know you're kidding, but normal desire between husband and wife isn't
lust. (There can be lust even between spouses, but that's a different
matter.)
Is there, theologically speaking, anything wrong with lust within
marriage?
John
[/quote]
As distinct from normal desire, yes. God invented sex, so He's entirely
in favour of it when used as directed. (See the Song of Solomon.) OTOH
when a husband or wife starts using the other spouse as an object,
merely to gratify desire, that starts breaking down the marriage rather
than building it up. Sex cements the marriage relationship, produces
children, and protects the spouses from lust--as well as being great fun
and very funny in spots.
If the spouses are primarily interested in their own private pleasure,
rather than in giving themselves to each other without reservation, that
is a Bad Thing. Any time we regard other people merely as a means to
an end, rather than as ends in themselves, we sin against charity.
Another way of putting it is that our spouses know when we're putting
them first and when we aren't. (Theology is a very practical study.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net |
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| John Larkin... |
| Posted: Wed Oct 21, 2009 4:12 pm |
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Guest
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On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs
<pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[quote]Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
...Jim Thompson
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
Cheers
Phil Hobbs
[/quote]
I've got a green LED connected to a 3v lithium battery through a 1M
resistor, and it makes a nice little night-light that should last 20
years or so. The Agilent LED is visible in office light at under 200
nA, as are some Infineon parts.
I'll try them in the dark.
John |
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| Rich Grise... |
| Posted: Wed Oct 21, 2009 4:35 pm |
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Guest
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On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs wrote:
[quote]Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
[/quote]
I did this experiment a couple of years ago, with a COTS RS-type red LED.
BMF cap, resistor, and two meters. From 20 mA down to about 10 mA, the
brightness didn't noticeably change, then from 10 mA down to zero, it
was "virtually" linear - of course, the log response of the eye might
have figured into it. I didn't try it at extremely low levels, but I did
shield my eyes so I had a little dark chamber between my hands. IOW,
linear "right down into the mud."
Cheers!
Rich |
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| Rich Grise... |
| Posted: Wed Oct 21, 2009 4:39 pm |
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Guest
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On Wed, 21 Oct 2009 16:30:34 -0400, Phil Hobbs wrote:
[quote]Rich Grise wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs wrote:
...
Each one is a sin against one or more of the corresponding virtues.
Lust <-- Justice, temperance
Without Lust, where would all the new little believers come from? >:-
I know you're kidding,
[/quote]
One, I'm not, and two, how could you possibly know? Just because it
doesn't fit inside your little box?
Sex without lust would be very boring indeed. Or maybe you're one of
the ones who thinks it should be a chore, only done when you want to
make more little Xtian soldiers?
Thanks,
Rich |
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| Phil Hobbs... |
| Posted: Wed Oct 21, 2009 5:32 pm |
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Guest
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Rich Grise wrote:
[quote]On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs wrote:
Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
I did this experiment a couple of years ago, with a COTS RS-type red LED.
BMF cap, resistor, and two meters. From 20 mA down to about 10 mA, the
brightness didn't noticeably change, then from 10 mA down to zero, it
was "virtually" linear - of course, the log response of the eye might
have figured into it. I didn't try it at extremely low levels, but I did
shield my eyes so I had a little dark chamber between my hands. IOW,
linear "right down into the mud."
Cheers!
Rich
We went over this a few months ago. At that point, you hadn't made any[/quote]
measurements down below 10 uA.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net |
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| Phil Hobbs... |
| Posted: Wed Oct 21, 2009 5:35 pm |
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Guest
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Rich Grise wrote:
[quote]On Wed, 21 Oct 2009 16:30:34 -0400, Phil Hobbs wrote:
Rich Grise wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs wrote:
...
Each one is a sin against one or more of the corresponding virtues.
Lust <-- Justice, temperance
Without Lust, where would all the new little believers come from? >:-
I know you're kidding,
One, I'm not, and two, how could you possibly know? Just because it
doesn't fit inside your little box?
Sex without lust would be very boring indeed. Or maybe you're one of
the ones who thinks it should be a chore, only done when you want to
make more little Xtian soldiers?
Thanks,
Rich
[/quote]
Sex without _desire_ would be a drag, yes--just ask a prostitute. Lust
is another issue. That's one of those places I was alluding to where the
vernacular and theological uses are different.
The rest of your post is pure projection--you sure didn't get any of
that from anything I wrote.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net |
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| Ingvald44... |
| Posted: Wed Oct 21, 2009 5:36 pm |
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On Tue, 20 Oct 2009 21:34:03 -0400, "Martin Riddle"
<martin_rid at (no spam) verizon.net> wrote:
[quote]
"Jon Slaughter" <Jon_Slaughter at (no spam) Hotmail.com> wrote in message
news:hblluq$ko5$1 at (no spam) news.eternal-september.org...
Anyone know if there is a psychological term for those who believe
those that have wealth are evil and wish to do them harm? I don't mean
in an economic or political sense but those that have some disorder
from childhood.
Blue collar worker?
Union member?
Cheers
Democrat[/quote] |
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| krw... |
| Posted: Wed Oct 21, 2009 7:17 pm |
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On Wed, 21 Oct 2009 19:36:11 -0400, Ingvald44 <noone at (no spam) nowhere.com>
wrote:
[quote]On Tue, 20 Oct 2009 21:34:03 -0400, "Martin Riddle"
martin_rid at (no spam) verizon.net> wrote:
"Jon Slaughter" <Jon_Slaughter at (no spam) Hotmail.com> wrote in message
news:hblluq$ko5$1 at (no spam) news.eternal-september.org...
Anyone know if there is a psychological term for those who believe
those that have wealth are evil and wish to do them harm? I don't mean
in an economic or political sense but those that have some disorder
from childhood.
Blue collar worker?
Union member?
Cheers
Democrat
[/quote]
Nah, they're the party of the rich. They just don't want anyone else
to become rich. |
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| krw... |
| Posted: Wed Oct 21, 2009 7:21 pm |
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On Wed, 21 Oct 2009 09:02:53 -0400, PeterD <peter2 at (no spam) hipson.net> wrote:
[quote]On Tue, 20 Oct 2009 18:49:54 -0700 (PDT), brent
bulegoge at (no spam) columbus.rr.com> wrote:
On Oct 20, 8:51 pm, "Jon Slaughter" <Jon_Slaugh... at (no spam) Hotmail.com> wrote:
Anyone know if there is a psychological term for those who believe those
that have wealth are evil and wish to do them harm? I don't mean in an
economic or political sense but those that have some disorder from
childhood.
The spiritual term is sin:
"Thou shalt not covet"
All of socialism is built on a complete rejection of one of the ten
commandments.
One? You need to look more carefully. Isn't there one that says: "Thou
shall not steal" as well? When you take from someone without their
consent that's stealing, and that is what Obama proposes...
[/quote]
Add 1, 2, 3, 5, 7, and 9, in addition to 8 and 10. |
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| John Larkin... |
| Posted: Wed Oct 21, 2009 8:25 pm |
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Guest
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On Wed, 21 Oct 2009 15:12:16 -0700, John Larkin
<jjlarkin at (no spam) highNOTlandTHIStechnologyPART.com> wrote:
[quote]On Wed, 21 Oct 2009 16:28:18 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
Jim Thompson wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs
pcdhSpamMeSenseless at (no spam) electrooptical.net> wrote:
[snip]
Phil, Switching to a new topic...
As I reduce the current in an LED, is there a critical current at
which light emission quits?
Or is it continuous right down into the mud?
...Jim Thompson
Yes, but just where this happens depends on the part. There are usually
nonradiative things (traps etc) that have to be kept full before you get
good emission--which is why optocouplers have that nasty toe below ~1%
of rated current. It isn't the photodiodes that are responsible. (Don't
even talk to me about phototransistors.)
If you want a really dim LED, a low power laser diode run below
threshold is one approach--they're small, so the current density is higher.
I should do some measurements on modern display LEDs and find out what
their linearity is like.
Cheers
Phil Hobbs
I've got a green LED connected to a 3v lithium battery through a 1M
resistor, and it makes a nice little night-light that should last 20
years or so. The Agilent LED is visible in office light at under 200
nA, as are some Infineon parts.
I'll try them in the dark.
John
[/quote]
OK, in the dark but not very dark-adapted, the green and the red Osram
led's are clearly on at 30 nA, with the green brighter than the red.
With the rig I brought home, I can't get a stable current below that.
The blue kicks in around 250 nA and the orange maybe 1 uA.
Should have brought home the old Keithley electrometer and some 100M
resistors.
John |
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| JosephKK... |
| Posted: Fri Oct 30, 2009 9:29 pm |
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Guest
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On Wed, 21 Oct 2009 15:39:16 -0700, Rich Grise <richgrise at (no spam) example.net>
wrote:
[quote]On Wed, 21 Oct 2009 16:30:34 -0400, Phil Hobbs wrote:
Rich Grise wrote:
On Wed, 21 Oct 2009 14:42:07 -0400, Phil Hobbs wrote:
...
Each one is a sin against one or more of the corresponding virtues.
Lust <-- Justice, temperance
Without Lust, where would all the new little believers come from? >:-
I know you're kidding,
One, I'm not, and two, how could you possibly know? Just because it
doesn't fit inside your little box?
Sex without lust would be very boring indeed. Or maybe you're one of
the ones who thinks it should be a chore, only done when you want to
make more little Xtian soldiers?
Thanks,
Rich
[/quote]
Pervert. Proper sex is about sharing, joy, and procreation. No lust
is needed or appropriate, and should not be present; your partner is a
person not an object. |
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| JosephKK... |
| Posted: Fri Oct 30, 2009 9:31 pm |
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On Wed, 21 Oct 2009 19:37:36 +0100, Adrian C <email at (no spam) here.invalid>
wrote:
[quote]Rich Grise wrote:
On Tue, 20 Oct 2009 19:51:27 -0500, Jon Slaughter wrote:
Anyone know if there is a psychological term for those who believe those
that have wealth are evil and wish to do them harm?
Envy.
Despair.
[/quote]
No, look up despair and try again. |
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