MessageView 421F schematic

[sPoNiX]

On 3 Oct 2004 02:10:01 -0700, abdul.ahad@ntlworld.com (AA Institute)
wrote:

Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Buy a radio controlled boat!

sPoNiX

 

[Rich Grise]

On Monday 04 October 2004 02:32 am, Gordon Youd did deign to grace us with
the following:

Some people are allergic to nuts!.

And some nuts are allergic to people!

Ha! I got it first!

Cheers!
Rich

 

[John Woodgate]

I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <yFf8d.6239$nj.4542@newssvr13.news.prodigy.com&gt
about 'Water resistant motor', on Mon, 4 Oct 2004:

with often rather flimsy "bushings".
After a number of algae cleanings these bushings are what determines end
of life, usually.

You want the type of nylon bearing that some droid designed into
central-heating pumps in UK about 25 years ago. Over time they GREW, and
got tighter instead of looser, so that the pump seized up after about
three years.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Robert Baer]

Rob wrote:

Hi,I was wondering if anybody knows what a solenoid is, and what its
functions are...if anybody could explain this to me that would be
great...thnx

A solenoid is an inductor wound on a hollow core, which allows an
iron rod (plunger) to be attracted toward the center.
Usually there is a method (other than a spring) to push/move the
plunger away from the center when the solenoid is not energized.
Used in door un-latching, mechanical counters, relays and other
things that need to be moved in a line.

 

[Robert Baer]

Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great

Try google or other net search engine first.

 

[Ian Stirling]

In sci.electronics.design Frithiof Andreas Jensen <frithiof.jensen@die_spammer_die.ericsson.com> wrote:

"AA Institute" <abdul.ahad@ntlworld.com> wrote in message
news:adbf5bc1.0410031012.181b6b1b@posting.google.com...

I just want it to keep the water surface stirring enough to stop the
pond from freezing over completely, and endangering the fish.

A small air pump - like used for aquaries??

The pump is left in a dry place and the hose can be as long as you like
because there will be little pressure drop with the miniscule flow.

If the pump is indoors, then in cold weather water will condense in the
tube, and block it freezing the tube, and stopping the flow of
air.

 

[Jan-Erik Söderholm]

You are expected to do your school homeworks yourself...
Jan-Erik.

Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great

 

[mike]

eat411 wrote:

I need to know if the resistance in an oscilliscope is high or not. i
believe they have a low resistance, but i am not sure why they would
need to be designed this way. I would appericiate an explanation.

thanks in advance

You are correct, they're designed that way.
I trust my answer was as clear as your question.
Wanna try again?
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Wanted GPIB Card for PC.
Bunch of stuff For Sale and Wanted at the link below.
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Keyser Soze]

Rob wrote:

Robert Baer <robertbaer@access4less.net> wrote in message news:<41625CE2.3070307@access4less.net>...

Rob wrote:


hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great


Try google or other net search engine first.


do you honestly think i haven't done that? i've been looking for a
while, and i can't find a short summary thats actually written in real
english. if you can answer the question then please do so, instead of
telling me to do something that is almost as pointless as your
existence

Honestly I do not think that you have used the search tools effectively.

Do you even know what is measured in Tesla units?

http://www.netdenizen.com/emagnet/index.htm
http://www.pacificsites.com/~brooke/Sensors.shtml

For someone asking for free research you have a bad attitude.

 

[Ed Price]

"Rob" <biggmg2003@yahoo.com> wrote in message
news:79303f95.0410051625.3b875cec@posting.google.com...

Robert Baer <robertbaer@access4less.net> wrote in message
news:<41625CE2.3070307@access4less.net>...
Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great


Try google or other net search engine first.

do you honestly think i haven't done that? i've been looking for a
while, and i can't find a short summary thats actually written in real
english. if you can answer the question then please do so, instead of
telling me to do something that is almost as pointless as your
existence

Politeness Man would suggest you need a whack alongside yer head. If you
can't figure out what a SOLENOID is after being exposed to 601,000 hits at
Google, you are dumber than a doorknob. Abandon electronics and take up
snail farming.

Ed
wb6wsn

 

[Ed Price]

"Rob" <biggmg2003@yahoo.com> wrote in message
news:79303f95.0410051622.6138777@posting.google.com...

Jan-Erik Söderholm <aaa@aaa.com> wrote in message
news:<41629A92.FE35AE6D@aaa.com>...
You are expected to do your school homeworks yourself...
Jan-Erik.

Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great

and jan-erik, you are expected to shut the hell up and go back to germany

Ah yes, a land where they know Tesla quite well. Meanwhile, many people can
answer your questions, Rob, and yes, it is great!

Ed
wb6wsn

 

[Rich Grise]

On Monday 04 October 2004 10:22 am, Joerg did deign to grace us with the
following:

Hi Robert,

Perhaps some of them might be DC, but AC vs DC is a good question;
it is the size and functionality that seems to be paramount..

I have never seen a DC pump from a garden center and since my wife is
into fountains and water features I have the distinct pleasure to take
all of them apart whenever one croaks. All there is besides plastic
stuff is an external winding that is fully encapsulated for safety
reasons and the rotating core, with often rather flimsy "bushings".
After a number of algae cleanings these bushings are what determines end
of life, usually.

There may be a chance to get DC at RV centers since that stuff has to
run off a 12V battery circuit. But it'll probably cost more.

I don't understand why the guy doesn't just go to a landscaping store and
pick up a pond pump. Or the pet store and get an aquarium pump. Or the
marine store and get a bilge pump. Or a bubbler.

Maybe he's a troll, or, since I haven't seen any comment from him since
the OP, maybe he's one of those ask-and-run guys.

Cheers!
Rich

 

[Electric dabbler]

"Robert Baer" <robertbaer@access4less.net> wrote in message
news:41625CB6.6090501@access4less.net...

Rob wrote:

Hi,I was wondering if anybody knows what a solenoid is, and what its
functions are...if anybody could explain this to me that would be
great...thnx


A solenoid is an inductor wound on a hollow core, which allows an
iron rod (plunger) to be attracted toward the center.
Usually there is a method (other than a spring) to push/move the
plunger away from the center when the solenoid is not energized.
Used in door un-latching, mechanical counters, relays and other
things that need to be moved in a line.

This answer could prompt the questions:

What is an inductor?
What is iron?
What is wound?

And anything else he can think of rather than reading and understanding the
copious information already on the web and in text books.

Philip

 

[Robert Baer]

Ed Price wrote:

"Rob" <biggmg2003@yahoo.com> wrote in message
news:79303f95.0410051625.3b875cec@posting.google.com...

Robert Baer <robertbaer@access4less.net> wrote in message
news:<41625CE2.3070307@access4less.net>...

Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great


Try google or other net search engine first.


do you honestly think i haven't done that? i've been looking for a
while, and i can't find a short summary thats actually written in real
english. if you can answer the question then please do so, instead of
telling me to do something that is almost as pointless as your
existence



Politeness Man would suggest you need a whack alongside yer head. If you
can't figure out what a SOLENOID is after being exposed to 601,000 hits
at Google, you are dumber than a doorknob. Abandon electronics and take
up snail farming.

Ed
wb6wsn

Definitely *not* a good profession, as the rope slips all of the time...

 

[News]

Spectrum Analyzer
An instrument which displays the frequency spectrum of an input signal,
usually amplitude vertical vs. frequency horizontal.

Field Strength Analyzer
Practical field-strength measurements call for an analyzer that is portable
yet powerful. The model 3290 RF Field Strength Analyzer from PROTEK Test and
Measurement (Allendale, NJ) is a handheld instrument that contains not only
a full-featured spectrum analyzer capable of measurements from 100 kHz to
2.9 GHz, but also a sensitive frequency counter, a host of demodulators, and
the choice of operating on batteries, AC, or vehicle DC power.

Reference
http://www.mwrf.com/Articles/ArticleID/8634/8634.html

Regards,
Erwin
erwinttl@yahoo.com

"J Autt" <lrttest@yahoo.com> wrote in message
news:54d52bd3.0410071004.cd3ea61@posting.google.com...

I am looking for a handheld Spectrum Analyzer BK2650 (Link1 below) or
Field Strength Analyzer Protek 3290 (Link2). The problem is that I
cannot see the major differences between them, yet there's a major
price difference of $1000-2000. Can anyone tell me what the major
differences between a spectrum analyzer and Field Strength Analyzer?
Is it in demodulation ways, sweep speed, display freq span, or some
extra stuff that I do not need as an amateur/electronics hobbyist?
Thanks.


Reference pictures:

Link1 http://www.testequipmentdepot.com/b+k%20precision/2650.htm
Link2 http://www.contacteast.com/product/group.asp?parent_id=10977

 

[Clarence]

"tejas" <tbsheth@yahoo.co.in> wrote in message
news:68a6c6ef.0410061024.3ca3a3e3@posting.google.com...

http://www.geocities.com/tbsheth

FREE HELP FOR EXAM & QUIZ

I welcome all electronics engineering.
I want to give a large callection of engineering question. on my site
you find 12 different subjects related to electronics engineering
feild.you will find anloge electronics, digital electronics, antennas,
power electronics, optical electronics,engineering
materials,electronics communication. i update my site every week so
keep looking for new quastion .

TROLL.....

 

[Ed Price]

"Robert Baer" <robertbaer@access4less.net> wrote in message
news:4164EEEC.4030108@access4less.net...

Ed Price wrote:


"Rob" <biggmg2003@yahoo.com> wrote in message
news:79303f95.0410051625.3b875cec@posting.google.com...

Robert Baer <robertbaer@access4less.net> wrote in message
news:<41625CE2.3070307@access4less.net>...

Rob wrote:

hi, i need to know what a tesla sensor is, what it does, and how it
can be used. if anybody can answer this, that would be great


Try google or other net search engine first.


do you honestly think i haven't done that? i've been looking for a
while, and i can't find a short summary thats actually written in real
english. if you can answer the question then please do so, instead of
telling me to do something that is almost as pointless as your
existence



Politeness Man would suggest you need a whack alongside yer head. If you
can't figure out what a SOLENOID is after being exposed to 601,000 hits
at Google, you are dumber than a doorknob. Abandon electronics and take
up snail farming.

Ed
wb6wsn


Definitely *not* a good profession, as the rope slips all of the time...

Professional snail wranglers use electric prods and herding aphids.

Ed
>

 

[Winfield Hill]

bigdan wrote...

**PRICE REDUCED to $450 + Shipping!!! Half-off! **

I have for sale an Agilent 33120A 15MHz Function/Waveform Generator.
This unit is about three years old, used but in excellent condition.
Guaranteed not DOA!

I'd like to purchase that elegant little item.


--
Thanks,
- Win

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

 

[Keyser Soze]

eat411 wrote:

I need to know if the resistance in an oscilliscope is high or not. i
believe they have a low resistance, but i am not sure why they would
need to be designed this way. I would appericiate an explanation.

thanks in advance

The answer depends on the kind of signal you need to measure and type of
oscilloscope used.

A typical oscilloscope vertical amplifier input will have a 1M ohm input
impedance. The typical 10x passive probe will have a 10M ohm impedance.

For signals of 350MHz or less conventional passive probes are fine.

Oscilloscope designed for signals from 500MHz to 4000MHz will benefit
from using active probes.

Active probes have high bandwidth amplifiers at or near the probe tip.

The amplifiers output is designed to drive a 50 ohm cable to the
oscilloscope vertical amplifier input.

Oscilloscope that are intended to use only active probes will usually
have only a 50 ohm input impedance.

-----------

The basic concept here is that it takes a lot of power to accurately
drive a 500MHz signal down a 1 meter cable. Most circuits that use
signals at this frequency do not have the needed power and are adversely
affected when connected to the load of an oscilloscope vertical
amplifier input.

The ideal oscilloscope probe would have very high impedance, low
capacitance and disturb the signal very little.

As the signal frequency increases it becomes much harder to make a probe
that can do what is needed.

 

[Joerg]

Hi Robert,

Perhaps some of them might be DC, but AC vs DC is a good question;
it is the size and functionality that seems to be paramount..

I have never seen a DC pump from a garden center and since my wife is
into fountains and water features I have the distinct pleasure to take
all of them apart whenever one croaks. All there is besides plastic
stuff is an external winding that is fully encapsulated for safety
reasons and the rotating core, with often rather flimsy "bushings".
After a number of algae cleanings these bushings are what determines end
of life, usually.

There may be a chance to get DC at RV centers since that stuff has to
run off a 12V battery circuit. But it'll probably cost more.

Regards, Joerg

http://www.analogconsultants.com