Driver to drive?

On Sun, 9 Jan 2005 16:11:11 +0000, John Woodgate wrote:

I read in sci.electronics.design that markzoom <markzoom@digiverse.net
wrote (in <7172c4fd.0501090729.17d84f6e@posting.google.com>) about
'Quick power supply question', on Sun, 9 Jan 2005:

Does the symbol, a solid line with a dotted line over it, denote an
unregulated or a regulated supply?

Officially, it just means 'DC'. People seem to think they can allocate
new meanings to these IEC 60417 symbols and everyone will be informed of
the changed meanings by telepathy.
Click to expand...
LOL

This guy should have been notified by prophetic telepathy that this
same topic would come up in the recent past and at that time you
would answer a question he wouldn't think of asking until a future
date :)

I wouldn't have expected this same topic to come up again so soon.
Amusing.

--
Best Regards,
Mike
 
"John Larkin" <john@spamless.usa> wrote in message
news:pgd3u0pmcq8pnpualg25b4ptub7r54oc2a@4ax.com...
And imagine opening a briefcase after a couple days of methanol
metabolism inside. It would smell like a mouldy barroom.
Click to expand...
Ethanol and methanol kill simple life forms (in high concentration).
Hence alcohol can preserve things by pickling.

Funky bar smells tend to arise from stuff growing on nutrients that are not
alcohol.
Spill beer, alcohol evaporates leaving the other stuff dissolved in beer
(e.g. malt sugars, caramels, etc).

If the waste products are CO2 and H2O, those are odourless.

And those products should leak out of the briefcase easily enough, since the
cellphone won't be using fuel at a great rate.
 
Jim Thompson wrote...
I suspect there's a motor-generator set made that runs on natural gas?
Just rig it up to run the furnace blower and some emergency lighting.
Click to expand...
Why bother with natural gas? Gasoline in a small tank is so much safer
to handle, and it's a thoroughly experienced and understood application.


--
Thanks,
- Win
 
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Subject: Re: windmill being hoisted
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developer wrote:



http://www.web7days.com/hydro/windmill2/

rfc- request for comment.

2. the direction of the wind will produce positive current or negetive
Click to expand...

Please tell me how this happens. How does it know when to make positive OR
negative current?



Thank you for your time.




mike
 
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Subject: Re: windmill being hoisted
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<lfADd.3610$06.2050@clgrps12> <crn8lr$s8k3@imsp212.netvigator.com>
<atjut01ht8ahkcjbqblfp3km38ao5tims2@4ax.com> <41dfff43.3295434@news.iol.ie>
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ZZZPK wrote:

Xian <user@anonymous.org> wrote:

: Hey xxxxxxxxx, just what the fuck has this to do with HK.Forsale
: Newsgroup?????
:
: Just xxxx xxx out'a here !

ha ha ha.... just the kinda language for uk.amateur radio :)
Click to expand...
The Honk Kong salesman types are obviously a vulgar lot and not fit for
polite company. I'd not buy anything Chinese made until they complete their
manners and etiquette courses. That and getting out of Tibet.




mike
 
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Subject: Re: windmill being hoisted
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<lfADd.3610$06.2050@clgrps12> <crn8lr$s8k3@imsp212.netvigator.com>
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<lNTDd.4665$06.2205@clgrps12> <41e06619$0$14269$db0fefd9@news.zen.co.uk>
<qB6Ed.84204$KO5.65531@clgrps13>
<BrcEd.2329$Ii4.480@newsread3.news.pas.earthlink.net>
<tHnuHSDofV4BFwKT@jmwa.demon.co.uk>
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John Woodgate wrote:

UL has invaded CSA and annexed it? (;-)
Click to expand...

A 'Standard' procedure?



mike

"m II" <C@In.The.Hat> wrote in message news:g6fEd.54942$nN6.3384@edtnps84...
John Woodgate wrote:

UL has invaded CSA and annexed it? (;-)


A 'Standard' procedure?



mike
Click to expand...
 
Scott Miller wrote:
The resistor you have in series with the transformer primary is
soaking up a lot of energy, also. Once you have the feedback control
working (and the maximum on time limit that safely limits current in
the event of output overload) you might replace it with a ferrite bead
on a wire or other small inductor. C3 should be big enough to supply

What exactly does the ferrite bead accomplish? I've got plenty on hand to
try it with...
Click to expand...
Deep breath:

The current consumption of the transformer occurs in pulses (there is
current when the fet is on and none when it is off). This pulsing
load causes the 9 volt battery voltage to bounce because it does not
have a zero internal resistance, and there is inductance in the wiring
between the fet/transformer and the battery. Any circuits at the
fet/transformer end of that wiring will see both the battery bounce
and the additional inductive bounce caused by the pulses. The
capacitor connected directly between fet source and transformer (you
do have it very closely connected to those two points, I assume) acts
as a small local battery that soaks up a lot of that pulsation, so
that it does not all have to come from the battery through the wiring
inductance.

But a capacitor can provide and absorb current only if it changes
voltage. The formula that relates capacitive voltage to current is
I=C*(dv/dt), with I in amperes, C in farads, dv/dt in volts per
second. So if you want the battery to supply the average current
while holding steady voltage and also let the cap bounce up and down
with each pulse a bit, so it can supply the pulses and recharge
between them, you need some elasticity between the battery and the
cap.

That is what the resistor is doing. But it is also dropping voltage
at least equal to the average current from the battery to this
circuit.

An inductor instead, will provide the elasticity that allows the cap
to soak up the pulses while the battery does not, but can waste very
little voltage if its resistance is low. A ferrite bead (or a few in
series) will only separate the harmonics of the pulse (the edges) from
the battery, but that may be enough to make the wiring inductance
fairly insignificant, so at least only the battery internal resistance
is involved in any bounce that other circuits see. A small wound
inductor will give better low pass filtering that separates the cap
voltage changes from the battery. A bigger cap with lower equivalent
series resistance and inductance will have to bounce less to soak up
the transformer pulses, regardless of what size inductor you use.


an entire power pulse with only a little sag. Say, a few microfarads
of electrolytic in parallel with .1 to 1 uf of film or ceramic for the

Looks like it's 220 uF right now.
Click to expand...
That is enough to supply essentially an entire pulse with very little
sag, but it will wiggle a bit because of its internal inductance. The
small high frequency capable cap in parallel damps more of that.

high frequencies. This will give you more voltage across the primary
during the on time and more energy in the core to be released during
the off time (narrower pulse needed).
--
Click to expand...
John Popelish
 
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Subject: Re: windmill being hoisted
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<lfADd.3610$06.2050@clgrps12> <crn8lr$s8k3@imsp212.netvigator.com>
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Morten wrote:

Well, I could use the same argument about the US and Iraq, at least the
illegal invasion part, and stop buying anything from the US. If it wasn't
because our own prime minister (Tony Blair) is just a crooked as President
Bush it would actually make sense to complain (you know the stone / living
in a glass house thingy)...
Click to expand...

He seems to be in good company here:

http://www.hated-celebrities.co.uk/

please vote


I'll still complain about the illegal invasion of Iraq though...
Click to expand...
It's an atrocity that will go down in history as an act worse that the Nazi
invasion of Poland.


mike
"m II" <C@In.The.Hat> wrote in message
news:qB6Ed.84204$KO5.65531@clgrps13...
Morten wrote:

Well, I could use the same argument about the US and Iraq, at least the
illegal invasion part, and stop buying anything from the US. If it
wasn't
because our own prime minister (Tony Blair) is just a crooked as
President
Bush it would actually make sense to complain (you know the stone /
living
in a glass house thingy)...


He seems to be in good company here:

http://www.hated-celebrities.co.uk/

please vote



I'll still complain about the illegal invasion of Iraq though...

It's an atrocity that will go down in history as an act worse that the
Nazi
invasion of Poland.


mike
Click to expand...
 
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Subject: Re: windmill being hoisted
References: <crmaob$c9c1@imsp212.netvigator.com>
<lfADd.3610$06.2050@clgrps12> <crn8lr$s8k3@imsp212.netvigator.com>
<atjut01ht8ahkcjbqblfp3km38ao5tims2@4ax.com> <41dfff43.3295434@news.iol.ie>
<lNTDd.4665$06.2205@clgrps12> <41e06619$0$14269$db0fefd9@news.zen.co.uk>
<qB6Ed.84204$KO5.65531@clgrps13>
<BrcEd.2329$Ii4.480@newsread3.news.pas.earthlink.net>
<tHnuHSDofV4BFwKT@jmwa.demon.co.uk>
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uk.radio.amateur:304500

John Woodgate wrote:

UL has invaded CSA and annexed it? (;-)
Click to expand...

A 'Standard' procedure?



mike

"m II" <C@In.The.Hat> wrote in message news:g6fEd.54942$nN6.3384@edtnps84...
John Woodgate wrote:

UL has invaded CSA and annexed it? (;-)


A 'Standard' procedure?



mike
Click to expand...
 
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Subject: Re: windmill being hoisted
References: <crmaob$c9c1@imsp212.netvigator.com>
<lfADd.3610$06.2050@clgrps12> <crn8lr$s8k3@imsp212.netvigator.com>
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Bob Yates wrote:

The USA has a long history of unprovoked attacks, look at WWII when they
attacked Germany, using an attack by Japan as the excuse. Or, the
destruction of the CSA, just to expand their tax base.
Click to expand...

The northern factories wanted cheap cotton. The northern politicians were no
different than today's crop of corrupt bribe takers.

Slavery and human rights had nothing to do with the Civil War. What Sherman
did on the way to the coast was a war crime of the same status as the
Baghdad bombardment. Atlanta was another..







mike
"m II" <C@In.The.Hat> wrote in message
news:cegEd.55662$nN6.41892@edtnps84...
Bob Yates wrote:

The USA has a long history of unprovoked attacks, look at WWII when they
attacked Germany, using an attack by Japan as the excuse. Or, the
destruction of the CSA, just to expand their tax base.


The northern factories wanted cheap cotton. The northern politicians were
no
different than today's crop of corrupt bribe takers.

Slavery and human rights had nothing to do with the Civil War. What
Sherman
did on the way to the coast was a war crime of the same status as the
Baghdad bombardment. Atlanta was another..







mike
Click to expand...
 
On Sun, 09 Jan 2005 16:29:22 -0700, Jim Thompson wrote:


Our kids all went together this year and bought us multiple gift cards
(and one gift certificate), good at our four favorite restaurants ;-)
Click to expand...
My kid gave my a gift certificate for my favorite gun store. ;-) He
didn't quite beat my best all-time present though. My wife gave me a
stainless S&W 617 .357Mag a few years ago. She's a keeper, eh?

--
Keith
 
On Sun, 09 Jan 2005 23:59:16 +0000, Michael Black wrote:

keith (krw@att.bizzzz) writes:
On Sun, 09 Jan 2005 10:47:18 +0000, Anthony Fremont wrote:


"keith" <krw@att.bizzzz> wrote in message
news:pan.2005.01.09.03.37.24.481575@att.bizzzz...
On Sun, 09 Jan 2005 01:18:02 +0000, Anthony Fremont wrote:


"Winfield Hill" <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote
in
message news:crp21l02gjm@drn.newsguy.com...
http://www.cnn.com/2005/TECH/01/03/cnn25.top25.innovations

CNN's list of the top 25 innovations of the last 25 years.

2. Cell phone
3. Personal computers

LOL, personal computers have been around longer than 25 years.

...depending on the definition.

I'd say the Apple and PET should qualify just as much as the first PC
that IBM put out. At least they had graphics capability. And everyone
knows that was the key factor to making the personal computer popular
;-)

The IBM PC was the first to wear the label. ;-) ...and it did have
graphics capability. Again, depending on what your definition is. ;-)

The Cromemco Dazzler fit into the Altair 8800. The Altair hit 30 years
ago, the Dazzler not much later, and provided color graphics. A couple
of months after the Altair was on the cover of Popular Electronics,
Click to expand...
I wasn't arguing that either the IBM PC, nor it's use of graphis was
somehow "new". It was the first to wear the "PC" badge though. ...again,
depending on how you define things one can come up with any number of
"right" answers.

the Cromemco Cylcops (Cromemco may not have been a company yet) was in
the magazine, a CCD camera that interfaced with the Altair. The Altair
was on the January 1975 issue, which came out in December. The Cyclops
may have been in the next issue, overlapping the second part of the
Altair article.

The PET and the Apple were downright late, unless one is going by the
title of "PC"; it had been a generic term before the IBM PC came along.
Click to expand...
Actually, it wasn't such a "generic term". It becames such retroactively.
Yes, I am old enough to remember all these failed widgets. ;-)

And of course, the concept predates the Altair. ALan Kay described a
"personal computer" when at Xerox Parc even if it was never implemented
at that point. And the Xerox Alto (or was it Altos?) was a single-user
computer, bringing in many of the things that later became common, even
if it never made it to a commercial product.
Click to expand...
Hell, *ALL* computers were "single user" in the '60s. ;-)

--
Keith
 
On Sun, 09 Jan 2005 23:23:46 +0000, Joerg wrote:

Hi Spehro,

It's a very clever example of how something as boring as gift cards
can be extended in an unexpected direction- and effectively creating a
new form of currency, as Rich implies.



Now just imagine: Pa gives son a Home Depot gift card for Christmas. Son
hands Pa a present: A Home Depot gift card! This has actually happened.
Then there are the 'sinner's gift cards'. We can buy cards that hold
x-many pounds (pounds!) of bonbons and other candy from a certain local
brand. Yeah, it all tastes great but that really packs in the weight.

We only got one card ever. From neighbors whom we helped out of a
pickle. But there is a caveat: If you don't use it all up by this or
that date the restaurant takes a monthly 'maintenance fee' until
depleted. I never figured out what needs to be maintained on a gift
card. They never came out to polish the plastic or anything.

Now after that MP3 car radio story I feel really old. We live in the
stone age. No MP3, no DVD player, neither cable TV nor satellite. But,
we have a guitar, a piano, an old Hammond organ and a wood stove.
Click to expand...
Those things you describe are the cheap kind, like giving somebody a
coupon book full of "Buy one, get one free". They get a cut-rate because
the loss the store takes on the card is much, much cheaper than a
full-page ad in the Sunday supplement, and it gets the recipient into the
store more reliably.

The one I saw was actual cash money, on an ATM card with a given balance,
just like - wait a minute.

There are gift checks, which spend like a gift certificate, but anywhere,
and are full cash value. The card I saw was billed as a "travel" card -
essentially an ATM card with a certain balance, that if it gets lost, you
call, they deactivate the card, and issue you a new one for whatever you
had before you lost it. But I didn't see them offered as gifts - just for
one person, just like traveler's checks, but 100 times more convenient.

I really, really like the idea, being a dissident - it lets those of us
who are slipping through the cracks still buy stuff in a "cashless
society". ;-)

Cheers!
Rich
 
On Sun, 09 Jan 2005 17:50:00 -0800, Winfield Hill wrote:

Jim Thompson wrote...

I suspect there's a motor-generator set made that runs on natural gas?
Just rig it up to run the furnace blower and some emergency lighting.

Why bother with natural gas? Gasoline in a small tank is so much safer
to handle, and it's a thoroughly experienced and understood application.
Click to expand...
ISTR gasoline can sit in a lawnmower all winter and still run the mower.
;-) But for an emergency generator, how picky would you have to be about
keeping the gasoline "fresh"? 3 AM in the middle of a blackout is a pretty
awful time to go searching for an open gas station. =:-O

Thanks,
Rich
 
On Sun, 09 Jan 2005 21:15:12 +0000, Anthony Fremont wrote:

"keith" <krw@att.bizzzz> wrote in message
news:pan.2005.01.09.19.46.17.956917@att.bizzzz...
On Sun, 09 Jan 2005 10:47:18 +0000, Anthony Fremont wrote:


"keith" <krw@att.bizzzz> wrote in message
news:pan.2005.01.09.03.37.24.481575@att.bizzzz...
On Sun, 09 Jan 2005 01:18:02 +0000, Anthony Fremont wrote:


"Winfield Hill" <hill_a@t_rowland-dotties-harvard-dot.s-edu
wrote
in
message news:crp21l02gjm@drn.newsguy.com...
http://www.cnn.com/2005/TECH/01/03/cnn25.top25.innovations

CNN's list of the top 25 innovations of the last 25 years.

2. Cell phone
3. Personal computers

LOL, personal computers have been around longer than 25 years.

...depending on the definition.

I'd say the Apple and PET should qualify just as much as the first
PC
that IBM put out. At least they had graphics capability. And
everyone
knows that was the key factor to making the personal computer
popular
;-)

The IBM PC was the first to wear the label. ;-) ...and it did have
graphics capability. Again, depending on what your definition is.
;-)

I don't think you had pixel level control until Hercules came along and
fixed it.
Click to expand...
Yeah, they did. It was called the CGA - Color Graphics Adapter. 320x200,
16 colors, or bitmapped text at 40x25.

Hercules certainly got in on the game, and I can't say if they beat IBM to
market with the color graphics, but I hadn't heard of them until well
after I had a CGA. ;-)

Cheers!
Rich
 
On Mon, 10 Jan 2005 01:23:11 +0000, Joerg wrote:

Hi Scott,

Here is another low-tech alternative:

Place numbers on a word processor document. 0 through 9, as many times
as you need digits, non-proportional spacing. Now print that out on
overhead foil and cut them up.

Make a box with as many square cut-outs as there are digits. Or maybe
one more if donations come in more generously than anticipated. An old
but not too scratched file card box might do here. Place a light inside
(mind its heat dissipation though!) and affix diffuse perspex or
something similar behind the row of cut-outs so it disperses light, to
create even illumination. Take a piece of wood strip, notch out one
side, cut up in a miter box and glue around the cut-outs, in a way that
the notched side faces inwards so people can slide in the numbers of the
week. If this is for a church and it has a youth group: You've got helpers.
Click to expand...
Or if you have all week to change the numbers, individually-switched
segments made of 1-tube fluorescent fixtures. Bags of slide switches are
pretty cheap at RS. Be sure to be aware of shock hazard if switching
mains, I take no responsibility, etc.

Good Luck!
Rich
 
There's a large 4 digit 7 segment Led display (11" x 5") on ebay.
Item: : 3865333472
 
On Sun, 09 Jan 2005 16:32:02 -0800, John Larkin wrote:
On Sun, 09 Jan 2005 22:49:57 GMT, Richard the Dreaded Liberal
On Sun, 09 Jan 2005 11:07:34 -0800, John Larkin wrote:
On Sat, 08 Jan 2005 22:45:38 GMT, Richard the Dreaded Liberal
You're right. A dreaded liberal would never say such a thing. I just can't
bring myself to call myself a neocon, which are the people who would enjoy
that sort of hate.

The semi-official definition of "neo-conservative" is "a liberal who
has been mugged by reality." That's sort of an engineering approach to
social well-being.

What, they turn neocon to get revenge on reality by flipping over to perp?

Sounds logical to me.

OK, consider this perspective:

NeoCons have, philosophically, a sincere desire to make the world a
better place for everyone, both materially and spiritually.
Click to expand...
Yeah, in their infinite arrogance, they claim to know what's "better" for
everybody, regardless of whether or not it's true.

Make your own life better, but let others muddle through the best they can
- that's called "live and let live", or sometimes, "respect."

Help them if they ask, but otherwise, mind your own damned business.

Good Luck!
Rich
 
On 9 Jan 2005 17:47:26 -0800, Winfield Hill
<hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:


Discussion? Or insults, whatever.

Sheesh, I expected a better argument from you.
Click to expand...
So, insults it is.

John
 
In article <41E172E1.85D21DA9@rica.net>,
John Popelish <jpopelish@rica.net> wrote:

[... me ...]
I've used this same basic design for the output several times. It isn't
all that strange. As far as PWM regulation goes, it is a flyback design.
The doubler means that the output has N*Vin added to it.

As I said, it can be regulated as long as the N*Vin is considerable
less than the desired voltage, so that adjusting the flyback voltage
component is enough.
Click to expand...
The OP needs a good rule for "considerable". I think he is safe so long
as N*Vin is less than about 50% of the desired. He should be sure to
limit the duty cycle of the PWM to not exceed this same percentage.



--
--
kensmith@rahul.net forging knowledge
 
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