hi

thats very good....as a response i will say that there should be more
of practical things like simple interesting circuits which can be made
easily(i mean that the components should be available easily) and also
problems and other things(like reading a data sheet,understanding the
component numbering like 1N1007,741 etc) which arise in practical
circuits which are not given in textbooks.

text books no matter how good they are cant replace practical
experince....u see.

of course theory should be also be there but personally i am feed up
with it (doing a 4 year degree course in electronics and telecom).

aditya n

Has anyone noticed that wirewound chokes have all but disappeared from
the electronic suppliers lists these days? The omission of these and
certain other items with which I was once familiar, and the appearance
of new components like IC voltage regulators, is very disconcerting to
me, as I learned my electronics in the late 1940s and early 1950s
(before transistors) when I studied for Physics A level and the Amateur
Radio City and Guilds Institute Exam. I recently attempted to build a
small power unit with a voltage regulated smoothed output of 12V for a
model railway, but couldn't get the bl***y thing to work. However, once
I had swapped the reg. for a small transformer wired with half the
secondary winding as a choke, (Pi smoothing circuitry) I managed to
obtain the results expected. I would certainly not mind a simple
discussion of the _practical_ intricacies of transistor or IC circuitry,
as probably the more times one has the chance to absorb ideas the better
will become one's understanding.
For Info, my present interest in electronics is mostly concerned with
model railways: PSUs, Controllers for special purposes, LED projects -
lighting, miniature signs, etc., Signalling (automatic), Turntable and
Level Crossing electro-mechanical operation, Solenoids.
I am having a problem with a turntable circuit at present. I need a
double pole change over relay which will operate at circa 6V, _without
chatter_, so that I can latch it with contacts 'on' until the latching
(solenoid) circuit is broken elsewhere and thus reset. Can anyone
suggest a likely type or source?
What are the relative merits/demerits of including fuses in both the
line and neutral mains feed to a PSU and also in the +ve and -ve O/P? I
have fitted a Mains - 12VDC PSU in this way (with fuses in both) but am
having second thoughts about the safety of this arrangement if the fuse
in the neutral, or fuse in the -ve O/P should blow without corresponding
breaks in the other fuses.?
Keith Messent, Skipton, UK

One question I have for you all is: What level of electronics
are people on the list up to?? I would like to start posting some info
now that we have some members, But need to know where to start. Can I
assume that we all know the basics?? Or should I go into detail about
capacitance and resistance and REALLY basic stuff?? How about some
feedback...... It's very easy for me to forget how hard some concepts
of electronics can be to grasp, I've been working in the industry for
around tweenty years or so, though I'm no expert by a long shot... I'll
post some info I feel is intresting and not too advanced, and if it's a
bit much let me know and I'll make things a bit more basic.......

Feedback please......

)O( )O( )O( )O( )O( )O( )O( )O( )O( )O( )O( )O( )O( )O(

The Sinister Dragon

Hi. I just found this list. I'm strictly an enthusiastic electronic hobbyist.
I know the basics and like tinkering around with circuits and projects.
Frequently get lost in complicated circuit diagrams. :)
ralph

I know that people may criticize me for asking for
help on this but I am not an Electronics expert... yet.
And furthermore I don't believe in free energy. :)

I have a final project coming up for my electronics
class and the proffesor says that we have to build
something that requires sautering... it doesn't even have
to be breadboard. This project is just for fun because
my college requires a final project but my prof. likes to
base it all on a final, So the finished project does not have
to work. With those criteria in mind i though building some
type perpetual motion machine might be fun. In researching
on the net I found the easiest looking one (ie. cheapest) was

The plans are very sparse for this machine though. In your
profesional opinions is this just a hoax becasue the plans are so
nonspecific?

thanks,
awzse


_________________________________________________________
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Get your free @yahoo.com address at

Hi all,

???[Electronics_101] FREE CELLPHONE INTERNAL ANTENNA BOOSTERS

???????????????????????? This Member has now been removed from the list. As moderator I
will tolerate SOME advertising, But I have had several compliants about
these postings, and have given fair warning. These posts where both off
topic and comercial. Thankyou for all contributing to the group, I hope
to see the group grow further and increase discucion of electronics.

????????????????????? One question I have for you all is: What level of electronics
are people on the list up to???????? I would like to start posting some info
now that we have some members, But need to know where to start. Can I
assume that we all know the basics?? Or should I go into detail about
capacitance and resistance and REALLY basic stuff?? How about some
feedback......??? It's very easy for me to forget how hard some concepts
of electronics can be to grasp, I've been working in the industry for
around tweenty years or so, though I'm no expert by a long shot...??? I'll
post some info I feel is intresting and not too advanced,??? and if it's a
bit much let me know and I'll make things a bit more basic.......

????????????????????? Feedback please......
???

)O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(

???????????? The Sinister Dragon
???

Hey, Just because I'm EVIL,
???????????? Doesn't make me a bad person......????????? >:-)
???

Hi Everyone!

I am going to be relaunching StuckButton magazine on September 1.
Most of you know it, others won't - basically its a free magazine
(now) centered around any aspect of radio, electronics,
telecommunications and computing (well the technical (hardware) and
software fix side of computers anyway).

I'm looking for articles for the new bi-monthly magazine (now 60
pages, looks much more like a magazine should!). So if you want to
write about any of the above topics I've mentioned above (or anything
else related - just ask me), send a note to stuckbutton@...

I want as many articles as possible to keep a good collection, which
I will use as desired in certain issues (if not the first, maybe the
second - it'll get there!!!!). I won't be able to pay you anything
(it's a free magazine anyway!), but you will get all the credit you
deserve!

Photos, circuits, diagrams, cartoons, URLs, history, equipment
reviews, news items and "info snippets" etc are great also!

You can find it at:

Thanks, Dan Bartlett
StuckButton Editor-In-Chief

Accessories4U wrote:

Due to the new store promotion and advertising. We hand out FREE LCD Holograms for your cellphones.?We have over 80 kind of different of holograms for you to pick from our list:?8-BALL, AIRPLANE, ALIEN, ANGEL, AQUARIUS, ARIES, BABY ALIEN, BASEBALL, BAT, BLACK JACK, BULL DOG, BUTTERFLY, CANCER, CAPRICORN, CLOWN, COCONUT TREE, DICES, DOLLAR SIGN, DOLPHIN, DRAGON, EAGLE, EIFFEL TOWER, EYE BALL, FLAMINGO, FROG, GEMINI, GOLF, HAPPY TEDDY BEAR, HEARTS, JACK O' LANTERN, CRUCIFIX, KILLER WHALE, KINGKONG, LAPTOP, LEO, LIBRA, LIGHT BULB, LION, LITTLE FAIRY, MAN MOON, MIND, MUSICAL NOTE, MUSTANG, NASCAR, PEACE SIGN, PERSIAN CAT, PHARAOH, PIGLETS, PIRATE SHIP, PISCES, PUPPY, PUSSY CAT, COINS, QUESTION MARK, REAPER, REPTILE EYE, ROSE, SAGITTARIUS, SCORPIO, SHARK, SKIER, SKULL, SMILEY FACE, SNOW BOARDER, SNOWMAN, SOCCERBALL, SPACE SHUTTLE, SPIDER, STATUE OF LIBERTY, SUNSHINE, TAURUS, TEDDY BEAR, TIGER, TRAIN, T-REX, T-REX SKULL, TRICERATOPS, TROPICAL FISH, UFO, UNICORN, VIRGO, WIZARD, US FLAG, CANADA FLAG, SWISS WATCH

As moderator of the list, I have given this person a warning not to post advertising of this kind again. If it continues they will be asked to leave. I consider one warning sufficient.

)O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(

???? The Sinister Dragon
?

Hey, Just because I'm EVIL,
???? Doesn't make me a bad person......??? >:-)
?

Hello,

Due to the new store promotion and advertising. We hand out FREE LCD Holograms for your cellphones.

Is there some way to filter this spam crap from the list?

Bob,

There are many variables its true, but how about take any easy one.

Last time I took a common one apart it had a metal rectangle with lots
of copper wire wraped around it. How do you determine how many turns
of what gauge wire will produce the desired result.

You could use a 120vac to 12vac at 1 amp for an example with the
purpose to power a 12v light bulb drawing about 1 amp.

Larry

--- In Electronics_101@y..., "Bob" <rjgordon@f...> wrote:

I just want to know how you go about building a homemade
transformer. Thanks

It's so simple, a 3 year old could do it. On the other hand,

it's so

difficult, you'd need a engineering/manufacturing facility to do it.

Both

statements are completely true - depending on what characteristics

the

transformer has.

It is air core? Iron core? etc.

What frequency(s) does it operate on? Voltages? Currents?

How many sections or windings?

What is/are the intended load(s)?

What kind of (if any) shielding is required?

What is it's ultimate function?

And a lot more questions I'm sure.

There are as many possible configurations for a transformer as
proverbial grains of sand. So you can see, a bit more information is

needed

before anyone can give you anything close to a usable response to

your

question.

Bob

开云体育

Something cute that I found... It may or may not be off topic.

The Sex life of an Electron
by Eddie Currents

One night when his charge was pretty high, Micro-Farad decided to seek out
a cute little coil to help him discharge.

He picked up Milli-Amp and took her for a ride in his Megacycle. They rode
across the Wheatstone Bridge and stopped by a Magnetic field with flowing
currents and frolicked in the sine waves. Micro-Farad, attracted by
Millie-Amp's characterisic curves soon had her fully charged and proceeded
to excite her resistance to a minimum. He gently laid her at ground
potential, raised her frequency and lowered her reluctance.

With a quick arc, he pulled out his high voltage probe and inserted it in
her socket, connecting them in parallel. He slowly began short circuiting
her resistance shunt while quickly raising her thermal conductance level
to mil-spec. Fully excited, Milli- Amp mumbled "MHO...MHO...MHO"

With his tube operating well into class C, and her field vibrating with
his current flow, a corona formed which instantly caused her shunt to
overheat just at the point when Micro-Farad rapidly discharged and drained
off every electron into her grid.

They fluxed all night trying various connectors and sockets untill his
magnet had a soft core and lost all of its field strength. Afterwards,
Milli-Amp tried self-induction and damaged her solenoids and with his
battery fully discharged, Micro-Farad was unable to excite his field. Not
ready to be quiescent, they spent the rest of the evening reversing
polarity and blowing each others fuses.


BUT WAIT!!! Theres M O R E !

Micro was a real-time operator and dedicated multi-user. His broad-band
protocol made it easy for him to interface with numerous input/output
devices, even if it meant time-sharing. One evening he arrived home just
as the Sun was crashing, and had parked his Motorola 68000 in the main
drive (he had missed the S100 bus that morning), when he noticed an
elegant piece of liveware admiring the daisy wheels in his garden. He
thought to himself, "She looks user-friendly. I'll see if she'd like an
update tonight."

Mini was her name. She was delightfully engineered with eyes like COBOL
and a Prime mainframe architecture that set Micro's peripherals networking
all over the place. He browsed over to her casually, admiring the power
of her twin, 32-bit floating point processors and enquired, "How are you,
Honeywell?" "Yes, I am well," she responded, batting her optical fibers
engagingly and smoothing her console over her curvilinear functions.

Micro settled for a straight line approximation. "I'm stand-alone
tonight," he said. "How about computing a vector to my base address? I'll
output a byte to eat, and maybe we could get offset later on." Mini ran a
priority process for 2.6 milliseconds then transmitted 8K. "I've been
dumped myself recently, and a new page is just what I need to refresh my
disks. I'll park my machine cycle in your background and meet you inside."
She walked off, leaving Micro admiring her solenoids and thinking, "Wow,
what a global variable. I wonder if she'd like my firmware?" They sat
down at the process table to a top of form feed of fiche and chips and a
bucket of Baudot. Mini was in conversational mode and expanded on
ambiguous arguments while Micro gave occasional acknowledgments, although
in reality he was anyalyzing the shortest and least critical path to her
entry point. He finally settled on the old,'Would you like to see my
benchmark routine?' but Mini was again one step ahead.

Suddenly she was up and stripping off her parity bits to reveal the full
functionality of her operating system software. "Let's get BASIC, you
RAM," she said. Micro was loaded by this stage, but his hardware policing
module had a processor of its own and was in danger of overflowing its
output buffer, a hangup that Micro had consulted his analyst about.
"Core," was all he could say, as she prepared to log him off. Micro soon
recovered, however, when Mini went down on the DEC and opened her divide
files to reveal her data set ready. He accessed his fully packed root
device and was just about to start pushing into her CPU stack, when she
attempted an escape sequence.

"No, no!" she cried. "You're not shielded!"

"Reset, baby," he replied, "I've been debugged."

"But I haven't got my current loop enabled, and I can't support child
processes," she protested.

"Don't run away," he said, "I'll generate an interrupt."

"No, that's too error prone, and I can't abort because of my design
philosophy."

Micro was locked in by this stage, though, and could not be turned off.
But Mini soon stopped his thrashing by introducing a voltage spike into
his main supply, whereupon he fell over with a head crash and went to
sleep.

"Computers!" she thought as she compiled herself. "All they ever think
about is hex."




_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at

adityan007@... wrote:

hi everybody

i just wanted to know what wattage soldering iron should be used for
normal electronic works (P C B ).

at present i have a jumbo size soldering iron which i use for
electrical
purposes which has a big tip.

also is there any tip sizes (if at all there are) for soldering iron
to be used for P C B because the one i have is a bit too big for??? P C
B (thats what i think).

aditya n

To unsubscribe from this group, send an email to:
Electronics_101-unsubscribe@...
???
???

Your use of Yahoo! Groups is subject to

Hi Aditya,

????????????????????? There is no easy answer to this question, it depends entirly on what
you intend to solder. How ever for the average hobiest, I would sugest
something in around the 60 to 100 Watt range as far as power is conserned.
Dependant upon which type of iron you buy there will be a huge range of
soldering iron tips. Which one you select will be nearly entirely personal
preferance. Three coman tip shapes are: Chisel, Pointy, and flat. I
personally prefer Chisel, around 2 to 5 mm at the tip. But this is becuase I
do alot of surface mount rework as a job.??? Cost is also an important factor.
No use dreaming about that $1000 dollar soldering iron with all the great
themo controls and fancy tips if you dont have the money. Personally, I
started off with a 200 watt Berko Iron with a 15mm tip 2mm diameter solder,
and bakers flux. And yes I soldered PCBs with it. Now however I use a Weller
TC-202 60W iron, with a variaty of tips. This is more than adequate for my
curent use. As an obsevration. I've been soldering for around thirty years
now, and in my experiance, practice is what counts rather than the tool. I
have seen some super educated people make a total mess with some really great
tools, and my wife is capable of doing some of the best most consistant work
I have ever seen with some real shit equipment (not mine) and no formal
training.

????????????????????? I feel the best advice I can give you however is test a few diferant
types of irons before you settle or buy one for yourself. If you have friends
with soldering irons, use thiers for a few hours if possible. Does it suit
your hand?? Can you make a good joint on a variaty of pads?? Desolder using
some desolder briad, How easy is it????? Does it do a good job with ease?? How
easy are the tips to change?? If possible experiment with differant tips, and
solder. If it's a thermostat type, (Adjustable) how easy is it to adjust?? Do
you like the controls?? You will hear all sorts of advice from all sorts of
people as to what the "Perfect iron"??? might be. However, largly I think is is
personal choice. Dont be afraid to try a few things out.
???

--
)O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(??? )O(

???????????? The Sinister Dragon
???

Hey, Just because I'm EVIL,
???????????? Doesn't make me a bad person......????????? >:-)

Visit My sites at Geocities:
??? Blood Moon -
??? Little Herbal -
??? Zenit Photographic -

Join my Egroup:
??? Inverted Pentagram -
??? Zenit-EM -
???

hi everybody

i just wanted to know what wattage soldering iron should be used for
normal electronic works (P C B ).

at present i have a jumbo size soldering iron which i use for
electrical
purposes which has a big tip.

also is there any tip sizes (if at all there are) for soldering iron
to be used for P C B because the one i have is a bit too big for P C
B (thats what i think).

aditya n

hi everybody

i just wanted to know what wattage soldering iron should be used for
normal electronic works (P C B ).

at present i have a jumbo size soldering iron which i use for
electrical
purposes which has a big tip.

also is there any tip sizes (if at all there are) for soldering iron
to be used for P C B because the one i have is a bit too big for P C
B (thats what i think).

aditya n

I just want to know how you go about building a homemade
transformer. Thanks

It's so simple, a 3 year old could do it. On the other hand, it's so
difficult, you'd need a engineering/manufacturing facility to do it. Both
statements are completely true - depending on what characteristics the
transformer has.

It is air core? Iron core? etc.

What frequency(s) does it operate on? Voltages? Currents?

How many sections or windings?

What is/are the intended load(s)?

What kind of (if any) shielding is required?

What is it's ultimate function?

And a lot more questions I'm sure.

There are as many possible configurations for a transformer as
proverbial grains of sand. So you can see, a bit more information is needed
before anyone can give you anything close to a usable response to your
question.

Bob

I just want to know how you go about building a homemade
transformer. Thanks

Hi,

I have a circuit that tries to run a solenoid by using a reed relay to connect the power. The circuit+relay works fine if I try and connect a motor, and the solenoid works fine if I just connect it direct to the power source. it seems like maybe my relay is switching on and off really fast instead of just staying on, does this seem possible and could it be the problem?

any advice appreciated,

Mark

Here's a couple of simple things I did with some Allegro
hall sensors. They make it real easy these days. The
ones I used only have 3 pins: +5V, ground, and output.
I don't know about max frequency, but you can follow
the links to their site. There's linear and switching
output types. And one is a switch that turns on when
it sees either pole of the magnet. Free samples online.

Magnetic Sensor as a Control Voltage Source


Whirly-Whirler LFO
Spinning plate toy and magnetic sensor as a
mechanical Low Frequency Oscillator.


- -- - Toby Paddock

----------
bbranham@... wrote:

Does anyone know what type of a component I can use
for an inductance sensor (kind used in like automotive
timing lights) I would like to generate a logic pulse per
voltage pulse for use in a Basic stamp Tachometer for
use on small engines. Will se up to absol. max 10,000
rpm's. Any body have any ideas. Otherwise does
anyone have a good expanation of how a hall effect
sensor works and if i could use it to send a pulse out
as the magnet of the flywheel spins past the sensor.
THanks all

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bbranham@... wrote:

Does anyone know what type of a component I can use for an inductance
sensor (kind used in like automotive timing lights)??? I would like to
generate a logic pulse per voltage pulse for use in a Basic stamp
Tachometer for use on small engines.??? Will se up to absol. max 10,000
rpm's.??? Any body have any ideas.??? Otherwise does anyone have a good
expanation of how a hall effect sensor works and if i could use it to
send a pulse out as the magnet of the flywheel spins past the sensor.

THanks all

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I think you'll find a Hall effect sensor much easier to use in the long run,
But I've never used one, so I can't give you detail on how to use them. I'm
sure any number of book at the local library should be able to hewlp you with
that more reliably than I can.......?????????????????? Good luck.......
???

--
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???????????? The Sinister Dragon
???
???

Does anyone know what type of a component I can use for an inductance
sensor (kind used in like automotive timing lights) I would like to
generate a logic pulse per voltage pulse for use in a Basic stamp
Tachometer for use on small engines. Will se up to absol. max 10,000
rpm's. Any body have any ideas. Otherwise does anyone have a good
expanation of how a hall effect sensor works and if i could use it to
send a pulse out as the magnet of the flywheel spins past the sensor.


THanks all