magnetic field

[Watson A.Name - \"Watt Su]

"John Fields" <jfields@austininstruments.com> wrote in message
newsggll0d2rdn76jf0hsntc5169ejpdsf3ln@4ax.com...

On Wed, 29 Sep 2004 04:26:20 -0700, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:


Y'see what I mean.. :-/

---
Ummm... no.

Care to expound on it?

--
John Fields

That's left as an exercise for the observers.

 

[Watson A.Name - \"Watt Su]

"Ioannis Vranos" <ivr@guesswh.at.grad.com> wrote in message
news:cjgpkb$dd4$1@ulysses.noc.ntua.gr...

Hi fellows, one somehow unusual question.


I was using some AAA 1.5V batteries for usual stuff (remote controls
etc) and recently decided to move to rechargeable batteries.

So I purchased 4x AAA Sanyo HR-4U batteries which turned to be of
1.2V.
I have not much micro-electronic background so I wonder, does this
make
any difference?

Are there any 1.5V rechargeable AAAs or is this the usual for such
rechargeables?

Some equipment will not work with Ni-Cd or Ni-MH rechargeables, because
of the lower voltage.

You could use the Rayovac 'Renewal' rechargeable alkalines, but they
don't last as long as the Ni-MH or Ni-Cds.

--
Ioannis Vranos

http://www23.brinkster.com/noicys

 

[Sylvia Else]

Watson A.Name - "Watt Sun, the Dark Remover" wrote:

So what were we saying about Zone of Legality? Bubbles? Whatever
happened to Bubble Memory? There's some neat magnetic fields doing some
neat things. But that's now extinct.

Didn't live up to its promise, and was overtaken in performance (speed
and density) by drams. MB memory was non-volatile, I seem to remember,
but that's not such a big issue.

Sylvia.

 

[John Woodgate]

I read in alt.binaries.schematics.electronic that Watson A.Name - "Watt
Sun, the Dark Remover" <NOSPAM@dslextreme.com> wrote (in <10ltotogs8qet9
f@corp.supernews.com&gt about 'Can someone Clue Me in About Veroboard?',
on Sat, 2 Oct 2004:

But the SRBP has me stumped,
I've never heard of it before - must be a U.K. term?

SRBP is 'synthetic resin-bonded paper' and is what you call 'phenolic'
(the type of resin is 'phenolic').
--
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

 

[John Fields]

On Sat, 02 Oct 2004 13:12:55 -0700, Jim Thompson
<thegreatone@example.com> wrote:

Surgical "clamps" (hemostats??) are handy circuit tools also.

---
In addition to their primary function; roach clips...

--
John Fields

 

[Dbowey]

jeffm posted:

<< >IN the over forty years I have used lead bearing solder, I have never seen
or

heard of anyone affected by the stuff. We all learned how to handle it.
Clarence

You hold the part with your left hand, the iron with your right, and the solder
in your teeth.
That worked well for me over the past 50 years. Is there any other method that
doesn't require three hands?

Don

 

[Dbowey]

Jim posted:

<< On Sat, 02 Oct 2004 14:31:17 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Sat, 02 Oct 2004 19:15:19 GMT, "Clarence" <no@No.com> wrote:


"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0410021013.6eb3ab20@posting.google.com...
IN the over forty years I have used lead bearing solder, I have never seen
or
heard of anyone affected by the stuff. We all learned how to handle it.
Clarence

You hold the part with your left hand, the iron with your right,
and the solder in your teeth.

What an IDIOT! You deserve to have your brain removed, it doesn't function!

---
Yes. Hold either the part or the iron in your teeth; _never_ the
solder.

Buy a good circuit vise that can be tilted, rotated, etc. Best thing
I ever spent a lot of money on... had it now for probably 30 years.
I have a couple of those too, but my jaw muscles cramp too soon due to the
weight.

Don

 

[Sir Charles W. Shults III]

If it upsets you so greatly, Clarence, you could always wrap a large
loop of the solder tightly around your neck and feed it into the active area
by leaning forward.

Cheers!

Sir Charles W. Shults III, K. B. B.
Xenotech Research
321-206-1840

 

[Terry Pinnell]

I use Veroboard for virtually all my projects. Like John J, I buy
large sizes, for economy and flexibility. (Not sure what you mean by
'snap off' though, John - I use a saw <g>.)

It's widely available in UK. I get mine from either Rapid Electronics
http://www.rapidelectronics.co.uk/rkmain.asp?PAGEID=80010&CTL_CAT_CODE=&STK_PROD_CODE=M29453&XPAGENO=1
http://tinyurl.com/5xnn9

or CPC
http://custom1.farnell.com/cpc/product.asp?catalog%5Fname=CPC+Catalogue&category%5Fname=&product%5Fid=263334
http://tinyurl.com/6rtl9

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[H. Dziardziel]

On Tue, 28 Sep 2004 10:50:23 +0100, T N Nurse
<tnnurseNOUCE99@hotmail.com> wrote:

I
snip

That's an interesting observation, and perhaps explains the previous
weird measurement. I note that someone else has said that their
expensive Fluke doesn't like transformer windings over 100 ohms.
I tried today with a different multimeter (and leads) and got the
expected readings. I assumed that it was the leads at fault, but
perhaps not.

Try shorting out one of the windings while measuring across both.
If you get the single coil reading it's the inductance and DMM
sampling that's doing this.

 

[Terry Pinnell]

"Watson A.Name - \"Watt Sun, the Dark Remover\""
<NOSPAM@dslextreme.com> wrote:

Thanks for everyones' help.
^^

Always pleased to see someone championing the "its versus it's" cause,
Watson - but you're at risk of being hoist by your own petard <g>.
That should be "everyone's" <g>.

P.S. This would have been an email, but darned if I can find a valid
address?

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Watson A.Name - \"Watt Su]

"Terry Pinnell" <terrypinDELETE@THESEdial.pipex.com> wrote in message
newsl82m0l9vg2572uhblcmpgijn0k2q98vr6@4ax.com...

"Watson A.Name - \"Watt Sun, the Dark Remover\""
NOSPAM@dslextreme.com> wrote:

Thanks for everyones' help.
^^
Always pleased to see someone championing the "its versus it's" cause,
Watson - but you're at risk of being hoist by your own petard <g>.
That should be "everyone's" <g>.

P.S. This would have been an email, but darned if I can find a valid
address?

Thanks for the typo clue.

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Jamie]

JeffM wrote:

IN the over forty years I have used lead bearing solder, I have never seen or
heard of anyone affected by the stuff. We all learned how to handle it.
Clarence


You hold the part with your left hand, the iron with your right,
and the solder in your teeth.

LOL!, I like that ! )

 

[Tim Auton]

"Watson A.Name - \"Watt Sun, the Dark Remover\""
<NOSPAM@dslextreme.com> wrote:
[snip]

Correct: That is his ball. I will not sacrifice its life.
WRONG: That is his' ball. I will not sacrifice it's life.

I enjoy reading your posts, but you're continually missing a simple rule
that's so easy to remember.

I used to get that wrong all the time till I mentally correlated "its"
with "his" and "hers". For some reason it had originally been wired in
my brain along with "Tim's". For some bizarre reason I was never
taught English grammar at school, though I understand it has now
returned to the curriculum.


Tim
--
Do you want your computer to trust a software vendor more than you?
http://www.cl.cam.ac.uk/~rja14/tcpa-faq.html

 

[Nicholas O. Lindan]

"Greysky" <greyskynospam@sbcglobal.net> wrote

Anyone know of a reliable way of detecting currents less than one femtoamp
i.e. 1X10^-16 amp full-scale?

Look under 'electrometers'.

1 fA = 1e-15, ?. Are you looking for 0.1 fA FS?

1A = 6.2e18 electrons/second.
1fA = 6,200 electrons/second.

You are not looking at current, you are counting electrons/second.
It can be done, however.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.

 

[John Larkin]

On Tue, 05 Oct 2004 08:54:37 GMT, "Greysky"
<greyskynospam@sbcglobal.net> wrote:

Anyone know of a reliable way of detecting currents less than one femtoamp
i.e. 1X10^-16 amp full-scale? I figure to perhaps use some instrumentation
amps air wired (no pc board) but have not had much luck getting reliable
readings below about a nano amp - and at this scale, even an accidental
breath can leave a film on the chip that creates a current path that swamps
the signal I am looking for.... some have suggested using lots of acetone
for cleaning the circuits, and using silver (or even gold) solder... others
have suggested measuring for resistance and figuring it from there.... I get
the feeling low current designs seem to be more an art than a science. Any
hints, pointers, or guffaws appreciated. Thanks

Greysky

What's the signal source? Can you use a lock-in trick?

John

 

[Jerry G.]

I can understand about the complexity of trying to measure such a low
current. There are many outside influences that can greatly effect the
measurement accuracy.

Try posting to, sci.physics. I have found some type of people over
there that are excellent with involved problems of this catagory.

--

Jerry G.
======

"Greysky" <greyskynospam@sbcglobal.net> wrote in message
news:hjt8d.6675$nj.2550@newssvr13.news.prodigy.com...
Anyone know of a reliable way of detecting currents less than one
femtoamp
i.e. 1X10^-16 amp full-scale? I figure to perhaps use some
instrumentation
amps air wired (no pc board) but have not had much luck getting reliable
readings below about a nano amp - and at this scale, even an accidental
breath can leave a film on the chip that creates a current path that
swamps
the signal I am looking for.... some have suggested using lots of
acetone
for cleaning the circuits, and using silver (or even gold) solder...
others
have suggested measuring for resistance and figuring it from there.... I
get
the feeling low current designs seem to be more an art than a science.
Any
hints, pointers, or guffaws appreciated. Thanks

Greysky

 

[Bob Myers]

"FEerguy9" <feerguy9@cs.com> wrote in message
news:20041004041807.05710.00005650@mb-m14.news.cs.com...

CoaL AND oil just store energy from the sun+.

No, they don't. They are both examples of
chemical substances (carbon in the one case,
and hydrocarbons in the other) which WHEN
COMBINED WITH OXYGEN (you keep forgetting
about this little thing called "burning") release
energy. In other words, burning coal is an example
of an exothermic reaction - but you're not magically
releasing energy that was "stored" in the coal in the
process, not like you mean here.

Just LIKE EER.+

Nothing like "EER." Capacitive storage IS an
actual storage of energy via electric fields, unlike the
above chemical examples. If you want to create an
"EER" device (or any capacitor) which "produces"
energy in the same manner as burning coal or oil
does, you'd start by lighting it...

You really ARE obsessed with this to the point of
ignoring any and all relevant information, aren't you?

i NEVER SAID EER WOUld *make* energy+.

Actually, you did, in claiming that it was similar to
chemical or other means of energy "storage". What
does "make" energy mean to you, Frank? Are you really
so ignorant and obtuse that you don't see the difference
between what happens when you burn oil, and what
happens when you discharge a capacitor?

Bob M.

 

[Pooh Bear]

John Woodgate wrote:

I read in alt.binaries.schematics.electronic that Watson A.Name - "Watt
Sun, the Dark Remover" <NOSPAM@dslextreme.com> wrote (in <10ltotogs8qet9
f@corp.supernews.com&gt about 'Can someone Clue Me in About Veroboard?',
on Sat, 2 Oct 2004:

But the SRBP has me stumped,
I've never heard of it before - must be a U.K. term?

SRBP is 'synthetic resin-bonded paper' and is what you call 'phenolic'
(the type of resin is 'phenolic').

Smells lovely - lol - when you solder to it too.

Graham

 

[Pooh Bear]

"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote:

I went to the veroboard website
http://www.verotl.com/products/index.cfm?content_id=2424A965-4AF2-433B-9
589A039D35545F5
and found a choice of verious sized boards to choos from. I also went
to the BISCO website, which is their U.S. distribs, but that was useless
because they need a part number, like no catalog whatsoever.

According to the Bisco website - they aren't a distributor for Vero ( or APW
).

Vero were bought by APW a few yrs back

http://www.apw.com/aboutAPW/sales/electronicSolutions.jsp

Maybe the California office can help ?

So I'm looking at the URL above, and I don't know which to choose from.
First off, the only VB I've seen was phenolic, not epoxy, so I guess I
want to order some of that, since it's easy to work with. And I know I
want single sided with 0.1" hole spacing. But the SRBP has me stumped,
I've never heard of it before - must be a U.K. term?

Synthetic resin bonded paper - awful stuff !

They make it in epoxy too which is much nicer.

I found this URL
http://www.plasticshimsandgaskets.co.uk/psg_apps/stage1/srbp.htm
which seems to allude to it being phenolic, but I'm not sure.

So I figured out that the VB # 01-0014 looks like it's a convenient
size, and presumably it's phenolic. Is this a commonly used size?

Dimensions look familiar.

What _is_ the size that one would find in a store?

When hobbyist stores still existed here chances were that they kept the
smaller panels. Not many ppl need 1/2 a metre of the stuff.


Graham