Electronics Forum / Electrical Engineering / June 2006

Hi
  Please suggestion me about circuit
Step-Up DC-DC Converter

I have an A/C Disconnect which i am not sure is wired properly. There
is a 30amp double pole breaker in the inside panel which has a RBG wire
connected (and a white wire nutted and capped). At the disconnect
(Eaton 30A a/c disconnect), the red and black connect to the line

For example, a small motor I use has the following on the nameplate:
60Hz - 230/460Vac - 1.4/0.70A
50Hz - 200/400Vac - 1.5/0.75A
The output power is the same as the current increases correspondingly,

I would like to build an elecronic version of the common simmerstat.
Power handling about 250 watts.
Switching from about 10% to full load.
I have not been successful with Google searches anyone have any ideas or

I want to know the limitation of this device.
for example i think when we have a welding socket in circuits ,we cant use
Isolation-transformer . is it true?

Hope this question is not off topic
Can anyone point me to a standard that defines
what the maximum external case temperature of a
"wall wart" PSU can  / should be ?

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From the first month in a new house I have had problems with the AFCI
tripping in the master bed room. All it takes is a small electrical
storm.  Thunder does not make a difference so vibration is not the
problem.

We're working on a kitchen renovation in a house built about
1900.  The kitchen space has been gutted down to the studs
and overhead joists and is nice and easy to wire with romex.
There are sufficient kitchen circuits to warrant a new

Does anyone out there have the communication software to permit a PC to
talk to a MaxPak III S6 drive.  The owner's manual states that the
filename is "MONMP3.EXE"
Thanks,

Pls find me some practical answer to the above matters;
1. Why in various connections shall be used cooper screw instead of
other materials.
2. Why a lot of screws (any types) is use for tighting terminals (HV or

Hi, i am currently analysing a static exciter setup of which i included
the following link to the schematic:
http://members.home.nl/damellema/CS4.PNG
It is a compound-source exciter, e.g. power to the generator field is

I wonder if someone has any ideas about the following scenario. I bought
a house last year that had a three phase supply but was only using 1 of
the phases. This meant I only had 3KW available from my 9kw supply which
was inconvienient. I got the electric company to install a 6k ...

Looking for a program that can do this:
Allow me to draw the high voltage open ring system of a site, consisting of
SF6 circuit breakers, ring main units and transformers.
This will be displayed on a pc screen and enable me to change the state of

Due to some tiles becoming misplaced in our shower, we've managed to
accidently flood the flat below's bathroom (with water dripping from
their light fitting).
Our shower has been repaired and no longer leaks but obviously has