Electronics Forum / Electrical Engineering / March 2009

For mains adaptors with LV DC outputs, is a visual/operation inspection all
that is needed to satisfy PAT testing requirements?
Thanks

Under UK rules & regs, is there a requirement to bund fluid filled
transformers to contain any insulating fluid leakage? This will be a new
transformer installation and the fluid will be Midel. There are other
transformers on site and these are not bunded.

I had an older Fluke, I think it was a 77, that had a handy function, an
audible diode check. It would beep once for a good junction, and emit a
continuous solid tone with a short while showing the forward drop on the
display. I found this very handy as a quick go/no-go test to ...

I don't know as much as i'd like about electrics, but i thought someone here
might be able to help.
Here's the thing...I need a generator. New, they're around £100 for a 750W,
but I've got an old 3.5 bhp engine which, i imagine is half of what the

Trying to find info about adding capacitors to 25hp 240v  3 phase ac
motor single speed that runs a cat pump at my car wash? There seems to
be commercial units but they hook up to main line and as I have two
25hp motors that start together at times this doesn't seem

While reading some technical descriptions of specific UPS models, including
user manuals, I have found that many describe a low voltage level at which
they "switch" or "transfer" from utility power to battery power.
For this kind of UPS, where even the utility power is always ...

So I was reviewing an old schematic for an opamp circuit that was built
before the prevalent IC's (circa 1965).  On the input, to protect from
over-ranging there were two bipolar junction transistors, wired directly
across the non-inverting and inverting input to the amplifier ...

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I use a Pentium quad HP with 3 gigs of ram.  This is a new system and all
software is the real thing and I paid the full price.  I have just spent
another 3 hours with this piece of sh.t with programs acting up, not closing
properly, printer having to be set to XPS to get ...

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I WILL FOREVER BE PUTTING MY FOOT UP A TROLLS ARSE BUT YOU MUST DO
YOUR PART AND REPORT TROLLS AND FLAMERS NOT THOSE THAT DEFEND
THEMSELVES FROM THUS

i am a new member

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Solutions Manuals in Electronic (PDF)Format! Just contact with ,
sendsolutions (at)  hotmail.com  (my email address),  these are parts
of our solutions, if the

Is it legal to sell a kit that includes all of the parts,
instructions, and diagrams so someone could build there own DC-DC
Converter kit? I believe it requires certifications (e.g., UL) to make
& sell DC-DC Converters, so someone suggested selling kits until I

I want to make a battery tester.  I am in the UK.
I'll use a fixed metal sheet which I will press the positive stud of a
cell on.  (A meter probe will go to the other end.)
(1) I tried an aluminium sheet for the metal but it didn't make good

This used to be a really good group. It'd be nice to get it back to
the way it was. At home I have generated a kill file as I use a proper
news reader and can thus filter out the 'noise'...but at work I have
to use Google Groups as that is all the IT dept. will allow. To all