Electronics Forum / Electrical Engineering / June 2007

Does anyone know of any places online that show how the windings of a
3 speed 6 Pole single-phase induction motor are wired because, I have
an old fan motor I been studying and I can't figure out how they
produced three speeds. It has no capacitors just a glass bulb with two

EASER = Electricity Amplification by the Stimulated Emission of
Radiation
MAASER = MAgnetism Amplification by the Stimulated Emission of
Radiation

I am in the UK.
Can I build a simple device which would switch a pair of contacts on/off
when my landline phone was being used.
Am thinking of something like this.  There might be a simple reed switch

Anyone has experience on this HUMplug-e product ?
Web page
http://www.21best.com/21_best/electronic/security/video/filters/for_sale_.html says:
" Simply plug your equipment through this, to cure it of Ground

I would like to calculate an output audio transformer based on a R20 r-core.
However, I could not locate any data for it like core length, area etc.
One Japanese web site shows the physical dimensions only. Where can I find
the core properties and manufactures web sites?

This one is pretty interesting. The antenna switch gear from a high power
transmitter fails and causes a destructive arc. The station is brodcasting
program material at the time and the music is heard from the arc. The
pictures at the end show the melted down switchgear.

why the rotating alluminium disk of induction type over current
relay's surface is rough or dotted? and why its shape is spiral?

I was told something and don't completely understand it.
I was told: If I place a scope probe across an AC outlet, I'll blow up the
probe because I'm placing the ground of the scope probe onto the AC outlet
and shorting it to ground.

hi i have just finished college i have achived a c&g in electrical
installations i have abit of experince in the filed i wuld like to
start appyling for jobs do i need any other qulifications? whats the
best way to go about it and get my dream job. At the moment i have a

To all those people who  has been in my position be for, with the C&G
2330 level 2&3 what postion can i apply for? A electrians mate or a
improver? Is it worth going for the 16 edition or shall i wait 4 the
17 to come out?

I operate an industrial surplus reuse store site called
reusestore.com. We deal with a lot of older obsolete parts. I also run
a company called Green Planet Solutions inc. We specialize in WEEE and
RoHS directives and engineering support. (www.atotalgps.com)

(to all those sparkys out there only who know what they are talking
bout reply only)
I have just finished college and achived my C&G 2330 level 2 & 3 i
know i have 2 have the 16 edition as well but as u may all know the 17

For conductor sag, is there a practical guide?  Is there a rule of the
thumb method that says for a span of 'x' meters - to calculate the
conductor length, add 10% to the span length.  Meaning, conductor
length = span length + 10% span length.  Is there a rule of thumb that

Is it possible to have an FM radio that receives radio signals at an
amplitude of only 1-photon-per-second? If so, can 1-photon-per-second
carry any useful info [like speech or music]?
If not, then why? Is this because a single photon cannot change its

Dear Friends
http://jobsearch.webinfolist.com is regularly updating the jobs
published in the leading newspapers of the world and also directly
from the employers.