Electronics Forum / Electronics / December 2004

Something I've never quite had a model for understanding about: Why does
electricity want to flow to the earth-ground?  Is it because the generator
producing it somehow is involved with the earth such that touching the earth
completes the circuit?

FS oscilloscope 20 Mhz Hitachi Model No V212
2 channel very good condition
sydney
Ben

i have a tool by which i can recognise a known voice.This can be used
in security systems,for example if u want to give access to a room to
only few people we store the voice when they say "open",and this can be
used to open the door when they say it next time.

Any body have the codes for the foxtel remote. send em to me thx
and information on the IR protocol...that would be great
have broken mine and want to program the universal with the binary codes
thx

Is it possible to connect 2 TV sets to one digital set-top box. IRegards

I have problems reading the text on a GPS display without glasses (which I
dont wear for driving). Anyone know if there's such a thing as an add on
display with larger text  for these kinds of situations ?
Jim

I need to know whether I am creating a hazard by plugging in too many
appliances into one socket- please advise.:-
500 watt convector heater,
14"TV,

Hi to all.
I'm working on a position tracker that uses ultrasonic transducersfor a
program by my university.
According to my plans it should work with ultrasounds of about 20-25kHz.

This is a "sort of" homework question, but I think it's valid to ask.
I did an experiment with the objective of modelling transformer losses.
Naturally one of the tests performed was the open circuit test, so that we
can determine core losses (Rc) and magnetizing inductance (Xm).

this is my 1st post here, i would like to know is there any differences
between these 3 op amps???
currently i am running some project of modifying some of the vintage
electronics, just hear that these 3 can be interchangable, if so which 1 is

At a computer fair a couple of weeks ago, I spotted this flying saucer
thingy. About 200mm in diameter, with a blade in the centre and a
counter-rotating shell, which also provides lift. Very simple and very
impressive. All remote controlled, with a rechargeable battery in the

I did not participate in this thread. Someone must have faked my email
address and name (again).
Clear skies,
Jonathan

Has anyone tried talking to a DS1393 or similar 3-wire RTC from either
a PIC or AVR (or similar) - these RTCs are not SPI - they have a
bi-directional I/O pin.
Thanks,

Anyone want a really early office "computer"?
It's a Burroughs L6000, and was used for accounting.
Reportedly a goer - has manuals, paper tape (no disk drives) and is
fairly big and heavy - desk size. Even has some paper ready to print on.

Can we use any cd-r disc to burn a dvd, or we need dvd-r disc to do it
better ?
I would buy a dvd burner but would use my cd-r disc .
thanx