Electronics Forum / Electrical Engineering / August 2004

A compact florescent light bulb in a lamp burned the other day. The ceramic
part of the bulb was very hot and chared.
Hasanyone ever heard of this happening to bulb of this type?
It isn't a halogen type, just a spiral type compact flores.

Im planning on taking my electricians exam on Nov. 20 in chicago. I
have read all the suggested materials, including the entire American
Electricians Handbook, and OSHA part 1926. Not an easy task
considering I run a full time business. My question is, has anyone

I understand that the CE standards required for wall-wart (plug-top) power
supplies depend on what they are being used with and in what environment.
I'm looking to sell a consumer audio accessory complete with a wall-wart
providing it with 9V DC (half amp). I assumed the ...

We currently have DC drives and motors used in our manufacturing plant,
rolling steel coils into tubes.  Someone recently said that we should
convert to AC drives and motors.
What is the better way? Or Pros and Cons.

What are the advantages of using single phase(115V, 60Hz)motorised
valve actuator on three phase (115V, 60Hz) actuator because most of
the manufactures are manufacturing it with single phase, but we want
to use three phase one.

Equipment Damaged
-----------------
The equipment damaged is DC motor of Hitachi make.
Item           DC motor

Why fluctuating current kills? Is the power being delivered much higher than
DC?
Thanks
Jack

Does it matter (accuracy etc) if the cable is positioned in the axial centre
of the ring CT? Or could it be installed offset with no adverse effect?
--
Regards

On many distribution lines I see what I believe are capacitor banks for
power factor correction.  A series of rectangular boxes each with two
insulating bushings, and it appears that one is connected to the phases
and the other to the neutral.  Sometimes one box per phase but ...

Not wanting to change subjects but the area of HVAC did come up. Here in the
south of Florida the AC is used almost the entire year.  The relay in the
outside compressor has had to be replaced about every 4 years.  This seems a
bit too much or??  I know it was the relay because I ...

Personal Lightning Protection - Calculations
Following on from my earlier comments on the Chat Zone
(www.epemag.wimborne.co.uk):
Assuming that the average human is 1.8m tall, then atmospheric charge at the

I make tea in a coffee maker and sometimes it gets cold before I pour it
off.
The coffee pot has one metal band all the way around the pot.
I have put it in the microwave for 3 or 4 min to reheat the tea and nothing

This is a very noob question but I'm going to ask anyways.
I'm looking at using an IC that only comes in a QFN package - any ideas if
its feasible it would be to mount that on a home-printed pcb? Can you get
sockets for them?

I know this is an engineering ng but I was hoping you could still provide
some
help as your area of expertise may possibly relate to what I'm after.
I'm a 4th year interactive design student working on a project which

Can anyone tell me where I can get a copy of the document mentioned above?