Driver to drive?

[Joerg]

Hi Durall,

Why don't you use CD4000 series flip flops? Those draw just microamps
when not DC-loaded at the outputs so you may be able to leave them
connected to the battery all the time.

Fresh air helps. But I don't have that luxury now. Too many wildfires,
soot and ash everywhere and a huge shroud of gray.

Regards, Joerg

http://www.analogconsultants.com

 

[John Larkin]

On Tue, 12 Oct 2004 03:20:46 GMT, Scott Stephens <scottxs@comcast.net>
wrote:

Why do you accuse benevolent genius out of the context they lived in,
judging them with our modern standards? That really is superficial,
cheap, easy to say. These people, behaving in typical European fashion,
could well have murdered each other, factionalized into states each
fighting to devour the other. But no, because they were not perfect,
angelic enough, to overcome every conceivable human vice you must smear
the immense good which they accomplished.

My point, perhaps stated too subtly for the audience at hand, is that
America has made steady and impressive advancements in the definition
of "liberty" and in the classes of people who are allowed to exercize
it. And America will, I trust, continue to do so. So I am mystified
why so many people get hysterical about truly trivial things, like
airline security and postal inspections, and declare hyperbolically -
in total ignorance of the history of this country - that we suddenly
live in repressive times. We don't.


John

 

[Pooh Bear]

John Larkin wrote:

I have a TDS2012 on my desk, displaying RS232 poll/reply sequences for
a uP thing I'm testing. With no input, it has about 0.1 cm p-p noise
at most gain settings, increasing to 0.5 cm p-p at 2 mv/cm. The noise
appears, to me, to be a mixture of real front-end analog noise, adc
quantization, and lcd pixellization. Welcome to the digital age!

Thank heavens for my old 465 !

I even had some old valve scopes before that such as the 545 !


Graham

 

[Jonathan Kirwan]

On Thu, 14 Oct 2004 22:58:25 GMT, "Clarence" <no@No.com> wrote:

Like anyone cares what a bunch of partisans say.

Sounds like the thinking of someone trapped in their own circular logic, which
excludes from consideration all that disagrees with their pre-chosen conclusion
by labeling it.

All available evidence regarding Kerry and Bush should be considered. You
cannot simply pick what evidence you want to consider and arbitrarily exclude
the rest. (If you're willing to be selective in the evidence you consider you
could reasonably conclude that the earth is flat.)

This statement by such a group cannot simply be tossed aside. Neither could the
shared letter by the 48 Nobel Laureates or those signatory-supporters of the
Union of Concerned Scientists report (which you should definitely read, in
detail.) Actually, in my own lifetime, I find this kind of highly informed,
organized response on such disparate disagreements with an administration as
quite unprecedented.

Jon

 

[John Larkin]

On Thu, 14 Oct 2004 20:22:39 GMT, Bob Stephens
<stephensyomamadigital@earthlink.net> wrote:

I had a TDS2012 on my desk and the quiescent noise was so bad I called up
the metrology lab we use for a repair quote. They said that this is a known
problem with this series of 'scopes and that no one including Tektronix
will fix them. He maintained that it is a condition that worsens with age
rather than an inherent design flaw.

Bob

I wonder if the increasing noise is an artifact of using multiple
interleaved ADCs to get the high sample rate. If the ADCs drift, it
will look like noise. At max gain, 2 mv/cm, the noise on my 2012 does
look bimodal, so it may be an adc interleave problem. There's likely a
cal factor somewhere that would fix that. An ideal design would
automatically synchronize the ADCs.

Interleaving fast ADCs is a non-trivial problem.

John

 

[Fred Bloggs]

Jonathan Kirwan wrote:

On Thu, 14 Oct 2004 22:58:25 GMT, "Clarence" <no@No.com> wrote:


Like anyone cares what a bunch of partisans say.


Sounds like the thinking of someone trapped in their own circular logic, which
excludes from consideration all that disagrees with their pre-chosen conclusion
by labeling it.

All available evidence regarding Kerry and Bush should be considered. You
cannot simply pick what evidence you want to consider and arbitrarily exclude
the rest. (If you're willing to be selective in the evidence you consider you
could reasonably conclude that the earth is flat.)

This statement by such a group cannot simply be tossed aside. Neither could the
shared letter by the 48 Nobel Laureates or those signatory-supporters of the
Union of Concerned Scientists report (which you should definitely read, in
detail.) Actually, in my own lifetime, I find this kind of highly informed,
organized response on such disparate disagreements with an administration as
quite unprecedented.

Jon

EXACTLY!!! You're finally getting the picture. Another unprecedented
occurrence is the amount and nature of information being leaked to the
press, New York Times usually, especially those items exposing Bush's
impeachable offense of withholding critical intelligence data from
Congress, and the National Security Council Estimate that Bush ignored.

 

[Rich Grise]

On Fri, 15 Oct 2004 00:44:48 +0000, Jonathan Kirwan wrote:

On Thu, 14 Oct 2004 22:58:25 GMT, "Clarence" <no@No.com> wrote:

Like anyone cares what a bunch of partisans say.

Sounds like the thinking of someone trapped in their own circular logic, which
excludes from consideration all that disagrees with their pre-chosen conclusion
by labeling it.

All available evidence regarding Kerry and Bush should be considered. You
cannot simply pick what evidence you want to consider and arbitrarily exclude
the rest. (If you're willing to be selective in the evidence you consider you
could reasonably conclude that the earth is flat.)

This statement by such a group cannot simply be tossed aside. Neither could the
shared letter by the 48 Nobel Laureates or those signatory-supporters of the
Union of Concerned Scientists report (which you should definitely read, in
detail.) Actually, in my own lifetime, I find this kind of highly informed,
organized response on such disparate disagreements with an administration as
quite unprecedented.

Oh, it's going to get better! >:-

Cheers!
Rich

 

[Rich Grise]

On Wed, 13 Oct 2004 23:34:58 -0400, HoloBarreŠŽ wrote:

All--

I'm interested in measuring vehicle miles per gallon, based on the
odometer signal and the fuel injector signals, which are all available at
the engine's ECM (electronic control module). Flowmeters are the benchmark
for such measurements, but for multi-cylinder vehicles, a real invasive
(plumbing) nightmare.
One representative fuel injector's signal would seem to be the best
and least invasive compromise--not an absolute measure of true mpg's, but
likely a very accurate "relative" indicator, good enough for my purposes,
which could be pretty well calibrated over time.
I presume I would need some spec's from the auto mfr (nissan, in
this case), but it's tough getting past Customer ""Service"".
Any ideas on how to obtain specs? To proceed in general? I don't
think the workshop manual would help w/ this type of info, but then....
Knowing the array of diagnositc equipment for a vehicle might
help, so maybe a well-equipped svc. dept might help.
Any leads would be greatly appreciated.

Are you looking at the signal that drives the injector? Or does the
processor have an output for flow rate? If you need to cut a line to
interpose a flow meter, why not the regular fuel line?

Good Luck!
Rich

 

[Jim Yanik]

Paul Burridge <pb@notthisbit.osiris1.co.uk> wrote in
news:sh1qm092pj9lnnm07erpl50md6velnh2nn@4ax.com:

On 13 Oct 2004 22:29:15 NZST, DaveC <bobason456@hotmail.com> wrote:

While I do not recommend building one for fear you will kill your self
or some one else.. I have seen this done with a bank of very large
capacitors each attached to a ring electro magnet.. the rings are
spaced to compensate for acceleration along outside of a tube the
diameter large enough for your projectile to fit in of course.

The capacitors are all fully charged, firing involved discharging each
capacitor in turn into it's respective coil, this takes careful
timing. Each coil attracts the projectile, and is designed to be fully
discharged; by the time the projectile reaches the coil, then the next
one and so on.

That's a 'rail gun' you're describing, isn't it?

No,a coil-gun.Rail guns operate much differently.
A rail gun has no coils,just two long metal rails,with a projectile with a
conducting base that shorts the rails and vaporizes into a plasma.The
projectiles must be injected at a high velocity to begin with.

--
Jim Yanik
jyanik-at-kua.net

 

[Chaos Master]

Quoting robin.pain@tesco.net [robin.pain@tesco.net], that posted to
sci.electronics.design on 14 Oct 2004 00:18:12 -0700:

I agree, M$ do not have full control of the operating system.

Once M$ wanted to end the BIOS, and create a custom loader. Obviously... it
would only work with MS products!
--
Chaos MasterŽ, posting from Brazil.
"I'd rather be hated for who I am, than loved for who I am not." -- Kurt Cobain

Evanescence: http://marreka.no-ip.com | Lies: http://tinyurl.com/46vru |
/dev/null: http://renan182.no-ip.org

 

[Chaos Master]

Quoting Tom [tom_cip_nospam@msn.com], that posted to sci.electronics.design on
Thu, 14 Oct 2004 19:40:54 -0700:

There must be some decent file sharing software out there. Please send some
recommendations.

SoulSeek. http://www.slsknet.org , the best IMHO.
Takes a bit to get used to, the interface looks like mIRC or old versions of
Netscape.

[]s
--
Chaos MasterŽ, posting from Brazil.
"I'd rather be hated for who I am, than loved for who I am not." -- Kurt Cobain

Evanescence: http://marreka.no-ip.com | Lies: http://tinyurl.com/46vru |
/dev/null: http://renan182.no-ip.org

 

[Country Loon]

"Steve Kavanagh" <skavanagh72nospam@yahoo.ca> wrote in message
news:5249fb3f.0410141603.6ef8f825@posting.google.com...

I am contemplating the use of a limiter at the output of a noise
source (to be used for rough noise figure measurement) to create a
noise source which doesn't need calibration, assuming the limiter
characteristics are known. The source would consist of a diode in
reverse breakdown (or whatever) to generate noise, followed by an
amplifier and a limiter. The amplifier would have to have enough gain
so that the majority of the time the limiter is active. The output
would then look (most of the time) like a digital signal with random
rise and fall times.

Can anyone comment on what issues there might be with this approach ?
In particular, the effect of the limiter on the noise spectrum is of
interest.

73,
Steve VE3SMA

Why not use PRBS?

Tom

 

[Jonathan Kirwan]

On Fri, 15 Oct 2004 07:36:29 GMT, "Clarence" <no@No.com> wrote:

It happens everytime a Republican is in office and the DemocRats can't see
anyway to dislodge him. In fact, I've seen it several times.

Please point out specific cases, with references. I'll look them up.

Jon

 

[Winfield Hill]

Clarence wrote...

Winfield Hill wrote ...
Fred Bloggs wrote...

Once again- another HUGE group, instrumental in government policy
making, warns America to oust Bush:

October, 2004 An Open Letter to the American People:

We, a nonpartisan group of foreign affairs specialists [ snip ]


Now it's "Non-Partisan!

Like anyone cares what a bunch of partisans say.

These specialists are Republican, Democrat and independent; they're
liberal, conservative, and libertarian. Also, "Currently serving
government experts also seem to agree with the scholars' message.
According to recent reporting by James Fallows in The Atlantic,
a wide array of working-level government national security officials
also assess that the war in Iraq has put back American efforts in
the broader fight against terrorism, rather than advancing it."


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)

 

[Tony Williams]

In article <2841401.0410141549.325f3e0a@posting.google.com>,
Durall <nfn8wzdm@yahoo.com> wrote:

I understand that a flip-flop will toggle between states when a
button is pressed. I'd like to know though, will it hold state
with NO power?

I have an led that I'd like to power with 4 'D' batteries. The
first time that I push the button, I'd like the LED to stay on.
The second time that I push the button the LED will go off. The
Flip-flop circuit will lose power too. The next time I push the
button, I'd like the LED to flash, say 3 times/second. 4th Push,
off again. Circuit loses power again. Goto first push.

CMOS that is static (not clocking) will probably take
less current than the internal leakage of the battery,
but look out for the ambush of any pullup/down resistor
that might be active when the device is OFF.

For example, don't disable that 3Hz oscillator into a
state where a timing resistor is drawing current.

--
Tony Williams.

 

[Tony Williams]

In article <20041014064620.07384.00002642@mb-m29.aol.com>,
Doug Goncz <dgoncz@aol.com> wrote:

Hello all. I have read Google: "self-excited induction
generator" to about 10%.

Induction generator
[snip]

There was a thread here (a year or so ago) that described
an interesting application of that "asynchronous generator".

It was about a conveying system, (in Australia?), that
carried ore for miles, up and down hills, but overall it
was downhill.

The whole system was driven by induction motors, which took
megawatts to get the ore moving, but once everything was up
to speed, the conveyer drove the motors. The motors then
became generators, and nicely acted as speed limiters for
the conveying system.

--
Tony Williams.

 

[ChrisGibboGibson]

"Daniel Kelly \(AKA Jack\)" d.kellyNOSPAM@NOSPAM.ucl.ac.uk wrote:

Hi,

I have a switch-mode powersupply unit that's injecting a high-frequency
ringing onto the input power rails (which is from a battery). Does anyone
have any ideas how to stop this? Would a simple diode and capacitor work?
Or an inducer? In which case, how do I chose the value of the inducer?

The DC-to-DC converter is:

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1831

Without asking lots of questions about the exact circuit components used...

Increase the size of the bulk capacitor (top left in the diagram) and insert an
inductor (about quarter the value of your main inductor) between the battery
and the bulk capacitor.

Gibbo

 

[Rich Grise]

On Fri, 15 Oct 2004 01:05:07 -0300, Chaos Master wrote:

, that posted to sci.electronics.design on
Thu, 14 Oct 2004 19:40:54 -0700:

There must be some decent file sharing software out there. Please send some
recommendations.

SoulSeek. http://www.slsknet.org , the best IMHO.
Takes a bit to get used to, the interface looks like mIRC or old versions of
Netscape.

Or, you could just switch over to Linux and laugh at the Windoze drones. ;-)

Cheers!
Rich

 

[Rich Grise]

On Thu, 14 Oct 2004 20:23:50 -0700, Tom Seim wrote:

Fred Bloggs <nospam@nospam.com> wrote in message news:<416E92E2.60807@nospam.com>...
Bush has made several characteristics of his leadership style clear: 1)
he refuses to acknowledge reality, 2) he refuses to acknowledge that he
made *any* mistakes whatsoever

Sounds like you, fredrook.

Is this supposed to have some significance? I'd certainly think something
that Fred Bloggs says would sound like Fred Bloggs. But who's this
"fredrook" you seem to have conjured up?

Thanks,
Rich

 

[Paul Burridge]

On Thu, 14 Oct 2004 12:39:39 -0700, John Larkin
<jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:

See pic in abse.

That thing ain't no scope! It's a pocket calculator. It ain't a real
scope unless you can tip it out of an office block window and kill
half a dozen people queuing for a bus. My ol' boat anchor qualifies;
your calculator doesn't.
--

"What is now proved was once only imagin'd." - William Blake, 1793.