Electronics Forum / Electrical Engineering / June 2005

i need some help.i am trying to get a thorough understanding on
passive filters.
can someone recommend some good simple books or websites?
i am kinda stuck with terms like  falling by 6dB....can anyone

I put a clamp on meter on the main cable from the meter into the panel and
noticed an imbalance (should read 0). Next, I checked the ground cable going
to a water pipe and found the same current flowing. I checked the pipe from
the ground clamp side to the house and the clamp to the ...

We have a very limited power from the utility. We can run the motor, but
can't start it. This motor turns a very large fan. Is it possible to start
without exceeding the run current? Since it is just a fan, the run-up time
can be longer. Thanks!

Hi,  I posted this a couple of years ago in this NG. It generated a heap of
responses and discussion, but I don't believe any of them could be called a
good explanation. I would really like to know the answer, so here goes
again. Maybe there's someone out there that can advise.

I bought a gable fan to install in my unfinished attic.
There is an outlet approximately 10' from where the fan will be
installed.  I was going to hard wire it into that same outlet...but,
then I was wondering why I couldn't just put a plug on the wire and

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Ok, here's the deal. I'm trying to record from my turntable to my pc. I have
a Newmark TT200 turntable and a good stylus. I'm using a Gemini PMX 01 mixer
as
my preamp. I have my turntable grounded to the Mixer as required. However, I

A/C unit has tripped the breaker twice this week, never done it before, very
hot here. Anything a handyman type could look at before calling the big guns
out?

Could anay body let me know if it is possible to build an adapter to run a
550 ac  3 phase motor on 220 ac single phase voltage.
thanks

Ok, here's the deal. I'm trying to record from my turntable to my pc. I have
a Newmark TT200 turntable and a good stylus. I'm using a Gemini PMX 01 mixer
as
my preamp. I have my turntable grounded to the Mixer as required. However, I

hi, living in florida i decided to buy a portable electric generator for
power outages, however a friend was telling  me do to a generators surge
not to use for computers. my question,  can i use a good surge protector
and be able to use the p.c.          thanks, jerry

Ok, i know this will sound pathetically stupid, but i'm only 16, and i
have no idea where to find out a solution to my problem.
Basically i brought a Roland KC 300 amp off ebay, and just realised it
was from america and i live in England

I've been reading a lot about early trans-Atlantic telegraph cables,
circa 1858.  These cables only transmitted a few words per minute, and
because they had no in-line amplifiers, *all* the energy for the signal
had to be supplied from the transmitting end.  Because the cables were

I need a to implement a circuit to detect ground fault.
The purpose of this circuit is to indicate to logic unit if ground in
present or not. The logic unit infact can interrupt voltage generation,
in every moment, if a ground fault is detect.

Whilst putting up a picture I drilled into the wall and hit a sunken 240v
power cable going to a 13amp plug socket.  It threw the house trip but when
I reset it all seems to work okay & the socket works fine (although I
haven't the equipment to test it, just plugged a lamp in)