Driver to drive?

[George Herold]

On Feb 8, 1:49 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:

On Wed, 08 Feb 2012 08:49:11 -0800, John Larkin







jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 8 Feb 2012 07:32:11 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 8, 9:48 am, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 22:09:33 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Tue, 7 Feb 2012 19:39:47 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 7, 9:53 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 18:40:31 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Sun, 5 Feb 2012 17:22:24 -0800 (PST), dagmargoodb...@yahoo.com
wrote:

On Feb 5, 5:39 pm, Jim Thompson wrote:
On Sun, 05 Feb 2012 14:08:18 -0800, John Larkin wrote:
On Sun, 05 Feb 2012 13:28:58 -0700, Jim Thompson wrote:

So far, life has been a huge amount of fun. But what does that have to
do with diodes?

The same as talking amps of current in a 1N4148.

http://www.nxp.com/documents/data_sheet/1N4148_1N4448.pdf

Looks effectively ohmic above 50mA (Fig. 3).

Yup. The slope is just about 1 ohm. The dynamic impedance of a PN
junction is 1 ohm at 25 mA.

Closer to 26mA ;-)

                                        ...Jim Thompson
--
[snip]

- Show quoted text -

1 ohm is a pretty good number for a small junction.  I measured a
2n3904 about the same.

Neat, how the resistance goes to ~1.5 ohms at ~450K.

George H.

Yup, the ohmic part has a positive TC.

Huh?  It does, but George was taking about the kT/qI portion...
450/300=1.5 ;-)

Opps,  I was talking about the resistive part.  It should also scale
with the absolute temperature, if the resistance is from some hunk of
'metal'.

Yes, I thought you were. JT's comment didn't make sense.

Why?  Because you don't understand kT/qI ?

Perfect diode, no resistive term, DYNAMIC impedance scales linearly
with temperature (°K).  So a perfect diode operating a 26mA at 300°K
has a DYNAMIC impedance of 1 Ohm; and 1.5 Ohm DYNAMIC impedance at
450°K.

Perhaps someone would plot 1N4148 forward drop on LOG paper so we can
easily see the bulk R breakpoint (and the _dirt_ at low currents, the
ISR coefficient in the model).

Oh, I'm all set up to do that. (testing diode thermometers)
Here's a link...(Image shack now wants me to register, so that's the
end of that.)

http://tinypic.com/view.php?pic=257df06&s=5

I could only get to 10mA. (The most my current source will do.) So
not into the ohmic region. The straight line is drawn by eye.

George H.

                                        ...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  |             |
| Voice480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon athttp://www.analog-innovations.com|    1962     |

I love to cook with wine.     Sometimes I even put it in the food.- Hide quoted text -

- Show quoted text -

 

[George Herold]

On Feb 8, 3:01 pm, George Herold <gher...@teachspin.com> wrote:

On Feb 8, 1:49 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-





Web-Site.com> wrote:
On Wed, 08 Feb 2012 08:49:11 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 8 Feb 2012 07:32:11 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 8, 9:48 am, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 22:09:33 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Tue, 7 Feb 2012 19:39:47 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 7, 9:53 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 18:40:31 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Sun, 5 Feb 2012 17:22:24 -0800 (PST), dagmargoodb...@yahoo.com
wrote:

On Feb 5, 5:39 pm, Jim Thompson wrote:
On Sun, 05 Feb 2012 14:08:18 -0800, John Larkin wrote:
On Sun, 05 Feb 2012 13:28:58 -0700, Jim Thompson wrote:

So far, life has been a huge amount of fun. But what does that have to
do with diodes?

The same as talking amps of current in a 1N4148.

http://www.nxp.com/documents/data_sheet/1N4148_1N4448.pdf

Looks effectively ohmic above 50mA (Fig. 3).

Yup. The slope is just about 1 ohm. The dynamic impedance of a PN
junction is 1 ohm at 25 mA.

Closer to 26mA ;-)

                                        ...Jim Thompson
--
[snip]

- Show quoted text -

1 ohm is a pretty good number for a small junction.  I measured a
2n3904 about the same.

Neat, how the resistance goes to ~1.5 ohms at ~450K.

George H.

Yup, the ohmic part has a positive TC.

Huh?  It does, but George was taking about the kT/qI portion...
450/300=1.5 ;-)

Opps,  I was talking about the resistive part.  It should also scale
with the absolute temperature, if the resistance is from some hunk of
'metal'.

Yes, I thought you were. JT's comment didn't make sense.

Why?  Because you don't understand kT/qI ?

Perfect diode, no resistive term, DYNAMIC impedance scales linearly
with temperature (°K).  So a perfect diode operating a 26mA at 300°K
has a DYNAMIC impedance of 1 Ohm; and 1.5 Ohm DYNAMIC impedance at
450°K.

Perhaps someone would plot 1N4148 forward drop on LOG paper so we can
easily see the bulk R breakpoint (and the _dirt_ at low currents, the
ISR coefficient in the model).

Oh, I'm all set up to do that.  (testing diode thermometers)
Here's a link...(Image shack now wants me to register, so that's the
end of that.)

http://tinypic.com/view.php?pic=257df06&s=5

I could only get to 10mA.  (The most my current source will do.)  So
not into the ohmic region.  The straight line is drawn by eye.

George H.

Oh I forgot to add that at 10mA the diode was heating up and the
forward voltage dropping, so the 725 mV number was the first thing the
DMM registered... and readings went down from there.

Geo

                                        ...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  |             |
| Voice480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon athttp://www.analog-innovations.com|   1962     |

I love to cook with wine.     Sometimes I even put it in the food.- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

 

[George Herold]

On Feb 8, 3:38 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:

On Wed, 8 Feb 2012 12:08:24 -0800 (PST), George Herold





gher...@teachspin.com> wrote:
On Feb 8, 3:01 pm, George Herold <gher...@teachspin.com> wrote:
On Feb 8, 1:49 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-

Web-Site.com> wrote:
On Wed, 08 Feb 2012 08:49:11 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 8 Feb 2012 07:32:11 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 8, 9:48 am, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 22:09:33 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Tue, 7 Feb 2012 19:39:47 -0800 (PST), George Herold
gher...@teachspin.com> wrote:

On Feb 7, 9:53 pm, Jim Thompson <To-Email-Use-The-Envelope-I....@On-My-
Web-Site.com> wrote:
On Tue, 07 Feb 2012 18:40:31 -0800, John Larkin

jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
On Sun, 5 Feb 2012 17:22:24 -0800 (PST), dagmargoodb...@yahoo.com
wrote:

On Feb 5, 5:39 pm, Jim Thompson wrote:
On Sun, 05 Feb 2012 14:08:18 -0800, John Larkin wrote:
On Sun, 05 Feb 2012 13:28:58 -0700, Jim Thompson wrote:

So far, life has been a huge amount of fun. But what does that have to
do with diodes?

The same as talking amps of current in a 1N4148.

http://www.nxp.com/documents/data_sheet/1N4148_1N4448.pdf

Looks effectively ohmic above 50mA (Fig. 3).

Yup. The slope is just about 1 ohm. The dynamic impedance of a PN
junction is 1 ohm at 25 mA.

Closer to 26mA ;-)

                                        ...Jim Thompson
--
[snip]

- Show quoted text -

1 ohm is a pretty good number for a small junction.  I measured a
2n3904 about the same.

Neat, how the resistance goes to ~1.5 ohms at ~450K.

George H.

Yup, the ohmic part has a positive TC.

Huh?  It does, but George was taking about the kT/qI portion....
450/300=1.5 ;-)

Opps,  I was talking about the resistive part.  It should also scale
with the absolute temperature, if the resistance is from some hunk of
'metal'.

Yes, I thought you were. JT's comment didn't make sense.

Why?  Because you don't understand kT/qI ?

Perfect diode, no resistive term, DYNAMIC impedance scales linearly
with temperature (°K).  So a perfect diode operating a 26mA at 300°K
has a DYNAMIC impedance of 1 Ohm; and 1.5 Ohm DYNAMIC impedance at
450°K.

Perhaps someone would plot 1N4148 forward drop on LOG paper so we can
easily see the bulk R breakpoint (and the _dirt_ at low currents, the
ISR coefficient in the model).

Oh, I'm all set up to do that.  (testing diode thermometers)
Here's a link...(Image shack now wants me to register, so that's the
end of that.)

http://tinypic.com/view.php?pic=257df06&s=5

I could only get to 10mA.  (The most my current source will do.)  So
not into the ohmic region.  The straight line is drawn by eye.

George H.

Oh I forgot to add that at 10mA the diode was heating up and the
forward voltage dropping, so the 725 mV number was the first thing the
DMM registered... and readings went down from there.

Geo

                                        ...Jim Thompson

[snip]

Semiconductors are notoriously difficult to measure.  You have to do
pulse testing to keep it from moving during the measurement.

Grin... Pulsing is beyond my test setup. But last time I looked at
these I subtracted the adjacent numbers (112.24, 112.79 and 118.78 for
the largest three,) and then atributed the difference in the last one
(6mV) to the resistance. 0.6 ohms in this case.

George H.

                                        ...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  |             |
| Voice480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon athttp://www.analog-innovations.com|    1962     |

I love to cook with wine.     Sometimes I even put it in the food.- Hide quoted text -

- Show quoted text -

 

[krw@att.bizzzzzzzzzzzz]

On Wed, 08 Feb 2012 11:52:31 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Wed, 08 Feb 2012 13:19:16 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:


"krw@att.bizzzzzzzzzzzz" wrote:

...it's like he was insulting your manhood. You certainly respond as such. I
wonder what Freud would have to say?


Sometimes a troll is just a troll...

I find it easier to just killfile krw.

Is there anyone you haven't killfiled, old man?

 

[John Larkin]

On Wed, 08 Feb 2012 19:13:45 -0500, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:

On Wed, 08 Feb 2012 11:52:31 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Wed, 08 Feb 2012 13:19:16 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:


"krw@att.bizzzzzzzzzzzz" wrote:

...it's like he was insulting your manhood. You certainly respond as such. I
wonder what Freud would have to say?


Sometimes a troll is just a troll...

I find it easier to just killfile krw.

Is there anyone you haven't killfiled, old man?

He's killfiled me several times. And then he cheats.




--

John Larkin, President
Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation

 

[Chairman Meow]

On Wed, 08 Feb 2012 13:00:12 -0600, amdx <amdx@knology.net> wrote:

Hi All,
I'm on a boat, about 170ft from the utility post.
Recently our cable company switched to the wonderful world of
Digital TV. I got the new digital converter and had no picture.
I took the box back and got a second box, still no picture. So now I
suspect a weak signal and confirm that it is the cable length. The cable
company came out and gave me a better cable than I had installed. At
this point I have a picture but it is intermittent. The signal at the
utility post has 3 outputs and had a four way splitter, I suggested the
cable guy put in two 2 way splitters and give me the stronger (first) tap.
That got my signal to work almost all the time. I'd like to get the
signal to work 100% of the time.
I don't has access to electricity at the utility post, so an amp is
out. Although I could try an amp at the cable box end. Is that reasonable?

You could make a battery operated amp. They do not draw that much
power.

I would run two cables if there was a way to make it increase signal
strength.

Nope. You want RG-6 for the run, and you want anti-oxidant paste in
the fittings. You also want to ask the cable guy what the power is at
the tap, and then you can figure out what your losses are at your end,
and know what level of amplification you need from that info.

Getting anymore from the cable company is not an option.

They are obligated to put the right amount of energy at the taps.
If you are more than -14dB down at your end, you will not be happy and
they may not be pushing hard enough.

If you use a battery amp, place it at the mid span point, if possible.

 

[The_Giant_Rat_of_Sumatra]

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark <makolber@yahoo.com> wrote:

Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?

Cable installers terminating things? You must be fucking joking.
They would have to have an IQ above 25 for that.

--
Regards, Joerg

http://www.analogconsultants.com/

right good question...OP, when you had the analog signal, was there
significant ghosting?

digital boxes might tolerate a WEAK signal but they are intolerant of
reflections.

Why would there be a reflection in a closed cable run?

 

[krw@att.bizzzzzzzzzzzz]

On Wed, 08 Feb 2012 18:52:10 -0800, The_Giant_Rat_of_Sumatra
<GeorgeTirebiter@drmemory.org> wrote:

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark <makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be fucking joking.
They would have to have an IQ above 25 for that.

*WAY* above your pay grade.

 

[tom]

On 2/8/2012 8:52 PM, The_Giant_Rat_of_Sumatra wrote:

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark<makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be bleeping joking.
They would have to have an IQ above 25 for that.

Which would obviously be considerably greater than yours.

tom
K0TAR

 

[tom]

On 2/8/2012 9:44 PM, krw@att.bizzzzzzzzzzzz wrote:

On Wed, 08 Feb 2012 18:52:10 -0800, The_Giant_Rat_of_Sumatra
GeorgeTirebiter@drmemory.org> wrote:

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark<makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be fucking joking.
They would have to have an IQ above 25 for that.

*WAY* above your pay grade.

Sorry I posted mine before I updated inbound posts and saw yours.

Yours is better.

tom
K0TAR

 

[The_Giant_Rat_of_Sumatra]

On Wed, 08 Feb 2012 22:44:08 -0500, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:

On Wed, 08 Feb 2012 18:52:10 -0800, The_Giant_Rat_of_Sumatra
GeorgeTirebiter@drmemory.org> wrote:

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark <makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be fucking joking.
They would have to have an IQ above 25 for that.

*WAY* above your pay grade.

I know about "cable trash" cable installers that used to go around to
different cities, working for different cable companies. I know what
corners they cut, and what responsibilities they shirk off. I know the
difference between them and me. It is way below my pay grade and way
above YOURS. Compared to you, I am the FADM, and you don't even rate 4-F.
Take your stupidity back to your left hand, putz!

I post-wired thousands of ports, and that was over 30 years ago, you
fucking retarded twit. I have done 350' runs through the woods when they
were unable to get the hard line trucks into the area. That's what
happens when the Bengals GM has his house all the way back in the corner
of an Indian Hills cul de sac. Mr Brown was a big dude too. There were
deep wear tracks in his carpet where the big fucker roamed. Outside the
tracks, it looked new.

Did lots of pre-wire too. Worked for General Instrument for the first
year I was out here in Ca as well. That was almost twenty years ago,
asswipe. I was performing instruction for them by the time I left.
The gear FEEDS the cable companies, AND the broadcasters.

You lose. As usual... again.

 

[The_Giant_Rat_of_Sumatra]

On Wed, 08 Feb 2012 20:15:51 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:

However, if you happen to have an tuneable notch filter
(which I happen to have),

Are you left handed? (It's a movie joke)

 

[The_Giant_Rat_of_Sumatra]

On Wed, 08 Feb 2012 22:17:05 -0600, tom <news4792@taring.org> wrote:

On 2/8/2012 8:52 PM, The_Giant_Rat_of_Sumatra wrote:
On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark<makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be bleeping joking.
They would have to have an IQ above 25 for that.


Which would obviously be considerably greater than yours.

tom
K0TAR

Said the *TOTAL* fucking retard who doesn't know me, or a goddamned
thing about me.

I did more last week to make the world a batter place than a putz like
you ever has or ever will in your entire, pathetic life.

And it was ALL absolutely telecommunications related.

Yeah, yer battin' 1000 there bub. NOT!

I'd bet cash at Vegas that you've never even seen what a 10Gb/s optical
port looks like, much less anything about its operation.

The only thing about "10" you have familiarity with is YOUR IQ.

You must be some cable trash asswipe residential hole popper
"installer" wanna be fucktard.

Yeah, you got the fucktard part right. Fits you to a "T".

Stick that up you TAR, K0 boy! You FUCKING RETARD! FOAD!

 

[The_Giant_Rat_of_Sumatra]

On Wed, 08 Feb 2012 22:20:13 -0600, tom <news4792@taring.org> wrote:

On 2/8/2012 9:44 PM, krw@att.bizzzzzzzzzzzz wrote:
On Wed, 08 Feb 2012 18:52:10 -0800, The_Giant_Rat_of_Sumatra
GeorgeTirebiter@drmemory.org> wrote:

On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark<makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be fucking joking.
They would have to have an IQ above 25 for that.

*WAY* above your pay grade.

Sorry I posted mine before I updated inbound posts and saw yours.

Yours is better.

tom
K0TAR

More mental masturbation. You must be a mere fucking cable installer.

Bwuahahahahahahaahahahahahahaa!

You and the KiethKeithStain are nothing more than mental masturbating
dumbfucks. Yer gonna get TARred and feathered, K0 boy.

 

[josephkk]

On Sun, 05 Feb 2012 14:06:30 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 05 Feb 2012 15:31:32 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jim Thompson wrote:

On Sun, 05 Feb 2012 09:38:32 -0800, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 05 Feb 2012 10:24:56 -0600, John Fields
jfields@austininstruments.com> wrote:

On Sat, 04 Feb 2012 18:08:32 -0800, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 04 Feb 2012 19:03:59 -0600, John Fields
jfields@austininstruments.com> wrote:



Actually, I did peruse two of those sites and found that with the
voltage drop across the diode, at the currents you mentioned, both
cases resulted in real-world power dissipation in excess of the limits
allowed.

Now you are weaseling.

---
Nope, just stating a fact.
---

In addition, the Fairchild site which, in figure 5, clearly plots the
ordinate in millivolts, is wrong.

Apparently not having noticed that, I suspect you'll now make excuses
and bitch on forever about how unimportant accuracy is.

It's not a matter of "accuracy", it's an obvious typo. The axis is
obviously volts.

---
If the axis was correctly annotated, would that not be more accurate
than if it were annotated incorrectly?

The y-axis on that fig 5 graph is obviously volts, and the "m" is
obviously a typo. Given that, there's no accuracy problem. My job is
to design stuff, not freeze in my tracks at the slightest excuse.

If you look at a smattering of 1N4148 data sheets, there's a huge
spread of I-V curves. So I certainly wouldn't design a circuit that
depends on the high-current I-V curve without making sure we'd
purchase only one vendors's parts, and even then it would be risky. I
wouldn't depend on their capacitance or reverse leakage behavior,
either. 1N4148 is a very sloppy part.

All of which is aside from the issue of paralleling LEDs, which lots
of people seem to do.

It must be hell to be manic depressive.

Nah, some of my favourite transistors are bipolar.

Cheers

Phil Hobbs

Mine, too >:-}

...Jim Thompson

Often useful for tran' sisters. Not necessarily good for engineers.

>;-b)

 

[Jasen Betts]

On 2012-02-08, John Larkin <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Wed, 08 Feb 2012 05:44:39 -0500, JW <none@dev.null> wrote:

On Tue, 07 Feb 2012 17:59:33 -0800 The_Giant_Rat_of_Sumatra

[...] the usual whinging.

That's British for "whining", isn't it? How is that pronounced?

pronunced win-jing

I'd consider whining to be high pitched and whinging moderate to
low pitched so it's closer to grumbling or moaning than to whining.

--
⚂⚃ 100% natural

--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---

 

[Lostgallifreyan]

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9FEBA85A1755Ezoodlewurdle@216.196.109.145:

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9FEB1AAA6770Dzoodlewurdle@216.196.109.145:

If there are any other problems I haven't seen any.



Just found one... If I model a voltage follower and feed it with a
negative voltage while running with a single supply rail, the output is
-1.14211V. Tt should be impossible to sustain a negative voltage in this
situation. I imagine small spikes might go south of the negative rail
due to any inductance or capacitance present, but not DC.

Hello Jim, did you see this one?
Also, the earlier one about unity gain stabilising capacitance..

 

[Pomegranate Bastard]

On Wed, 08 Feb 2012 21:35:51 -0800, The_Giant_Rat_of_Sumatra
<GeorgeTirebiter@drmemory.org> wrote:

On Wed, 08 Feb 2012 22:17:05 -0600, tom <news4792@taring.org> wrote:

On 2/8/2012 8:52 PM, The_Giant_Rat_of_Sumatra wrote:
On Wed, 8 Feb 2012 18:21:19 -0800 (PST), Mark<makolber@yahoo.com> wrote:



Just a point. I may not have made it clear. I had the tech put in two
2way splitters and connect me to the first one. Hoping to gain 3db.
(or 4) and it did make a difference.

Where does the other leg of that splitter go to? And is that end
properly terminated?



Cable installers terminating things? You must be bleeping joking.
They would have to have an IQ above 25 for that.


Which would obviously be considerably greater than yours.

tom
K0TAR

Said the *TOTAL* fucking retard who doesn't know me, or a goddamned
thing about me.

I did more last week to make the world a batter place than a putz like
you ever has or ever will in your entire, pathetic life.

A batter place? Quite appropriate for a batty man.

And it was ALL absolutely telecommunications related.

Would you please supply some evidence of your claims?

Yeah, yer battin' 1000 there bub. NOT!

I'd bet cash at Vegas that you've never even seen what a 10Gb/s optical
port looks like, much less anything about its operation.

The only thing about "10" you have familiarity with is YOUR IQ.

You must be some cable trash asswipe residential hole popper
"installer" wanna be fucktard.

Yeah, you got the fucktard part right. Fits you to a "T".

Stick that up you TAR, K0 boy! You FUCKING RETARD! FOAD!

 

[The_Giant_Rat_of_Sumatra]

On Thu, 09 Feb 2012 13:12:15 +0000, Pomegranate Bastard
<pommyB@dsl.pipex.com> wrote:

Would you please supply some evidence of your claims?

You don't even know what a 10Gb/s optical port looks like either,
jackass.

You are truly pathetic, and a total loser.

The only response a retard like you knows is "stalk and jab".

 

[Jim Thompson]

On Thu, 09 Feb 2012 06:56:58 -0600, Lostgallifreyan
<no-one@nowhere.net> wrote:

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9FEBA85A1755Ezoodlewurdle@216.196.109.145:

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9FEB1AAA6770Dzoodlewurdle@216.196.109.145:

If there are any other problems I haven't seen any.



Just found one... If I model a voltage follower and feed it with a
negative voltage while running with a single supply rail, the output is
-1.14211V. Tt should be impossible to sustain a negative voltage in this
situation. I imagine small spikes might go south of the negative rail
due to any inductance or capacitance present, but not DC.


Hello Jim, did you see this one?
Also, the earlier one about unity gain stabilising capacitance..

Neither one. I've been busy with "real" work ;-)

Elaborate on the follower conditions... are you saying output is below
rail? What load did you have, if any? I'm thinking on a
generalized OpAmp model which definitely solves such issues, but am
embroiled in other mathematical niceties at the moment ;-)

What is the unity gain stabilizing capacitance issue?

...Jim Thompson
--
| James E.Thompson, CTO | mens |
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| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

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