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Sci.Electronics.Basics -> why do we use these
There are 29 messages in this thread.
You are currently looking at messages 20 to 29.
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Author: Michael A. TerrellDate: 19:36 27-10-06
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PeteS wrote:
>
> Michael A. Terrell wrote:
> > PeteS wrote:
> >
> >>feebo wrote:
> >>
> >>>On 26 Oct 2006 11:20:04 -0700, "JeffM"
<jeffm_@email.com> wrote:
> >>>
> >>>
> >>>
> >>>>dhana wrote:
> >>>>
> >>>>
> >>>>>>what is the use of composite signal generator, zero
crossing detector
> >>>>>>and comparator
> >>>>
> >>>>.
> >>>>feebo wrote:
> >>>>
> >>>>
> >>>>>a zero crossing detect circuit is...
> >>>>
> >>>>When you subsidize a behavior, you get more of it.
> >>>>If the OP is too lazy to pay attention in class or to learn to use
> >>>>Google,
> >>>>a failing grade is apt.
> >>>>Please don't feed the homework trolls.
> >>>
> >>>
> >>>I hear what you are saying Jeff, and while I do agree that this is
> >>>probably someones homework I chose to give the benefit of the doubt.
> >>>Certainly if this had been posted anywhere but SEB I would have
> >>>ignored it.
> >>>
> >>>I'll try to be a bit more discerning in the future but I remember what
> >>>a mystery it all was (and a lot still is) all those years ago - I
> >>>couldn't even find someone to tell me how the pins on a transistor
> >>>related to the connections inside the circle (which was the emitter) !
> >>>so much water under the bridge since then :o)
> >>
> >>I think what JeffM (and myself) are saying is we help those who have
> >>tried to help themselves :)
> >>
> >>I will definitely help with homework *provided the OP has tried to solve
> >>the problem already* and is perhaps stuck on phraseologu or perhaps a
> >>somewhat murky chapter in a text.
> >>
> >>To paraphrase, _We help those who help themselves_
> >
> >
> >
> > All the others are to proceed to the closest fast food place to apply
> > for their job in their lifelong career in the food service industry.
> > ;-)
> >
> >
>
> Snort
>
> I know we all agree, but many an OP doesn't seem to realise that if you
> don't do your own work, you really won't learn anything. There are some
> professions where this may, in fact, be desirable. Engineering
> (especially design engineering) isn't one of them ;)
>
> Cheers
>
> PeteS
I had no one to answer my questions when I was eight years old, so I
read every book I could find, including college textbooks. I was
working part time in a TV shop at 13, and I still do my best to keep up,
40+ years later.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
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Author: BobGDate: 10:21 28-10-06
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JeffM wrote:
> It is obviously a homework assignment.
> The answers are readily available--probably in the OP's textbook.
=======================================================
All you old dinosaurs over 50 that use plain text and newsgroups: The
answer was indeed in his textbook. The internet is undoubtedly his
primary textbook. Doesnt he get any points for seeking the counsel of
the silverbacks on S.E.B.?
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Author: JeffMDate: 10:52 28-10-06
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BobG wrote:
>Doesnt he get any points
>for seeking the counsel of the silverbacks on S.E.B.?
The same credit he would get
if he tried to copy the answers off someone else's exam or
sat on his ass and tried to get someone else to do his assigned tasks.
The former would get him a zero
--with other consequences likely, possibly expulsion--
and the latter would get him fired.
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Author: Bob MyersDate: 13:55 28-10-06
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"BobG" <bobgardner@aol.com> wrote in message
news:1162045310.400406.176150@e64g2000cwd.googlegroups.com...
> JeffM wrote:
>> It is obviously a homework assignment.
>> The answers are readily available--probably in the OP's textbook.
> =======================================================
> All you old dinosaurs over 50 that use plain text and newsgroups: The
> answer was indeed in his textbook. The internet is undoubtedly his
> primary textbook. Doesnt he get any points for seeking the counsel of
> the silverbacks on S.E.B.?
Of course not. The point of pretty much all college education
is not simply to come up with the right answers, but to teach
the student how to get those answers ON THEIR OWN -
whether that involves running the calculations yourself, or
simply knowing what references to turn to. But other people
don't fall into the category of acceptable other references -
because I can guarantee you that once this person (with luck)
graduates and tries to start work as an engineer or technician,
turning to the person next to you and asking "would you solve
this problem for me?" isn't going to cut it. It doesn't matter
whether the "text" you need to look in is a book, the Net, or
carved stone tablets; the point is that YOU yourself are supposed
to be learning how to dig this stuff up when you need it.
It's perfectly fine to ask the sort of questions that are going to
lead to a better understanding of a given point - but it's not
OK to ask what is obviously the equivalent of "would you fill
in this blank for me?"
Bob M.
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Author: Jerry RDate: 15:42 28-10-06
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"PeteS" <peter.smith8380@ntlworld.com> wrote in message
news:n4O%g.27957$w07.6967@newsfe6-win.ntli.net...
> Bob Myers wrote:
>> "dhana" <dhana123@gmail.com> wrote in message
>> news:1161678951.772094.110690@m73g2000cwd.googlegroups.com...
>>
>>>what is the use of composite signal generator, zero crossing detector
>>>and comparator
>>
>>
>> 1. Composite signal generators are used in those applications
>> where all-metal ones would be too heavy.
>
>
>>
>> 2. Zero crossing detectors are used when it is important to
>> recognize and/or count the number of zeroes which cross
>> one's path. In many cultures, having your path crossed by a
>> zero is analogous to our beliefs regarding a black cat crossing
>> your path.
>
> This is important in some areas because zeroes are slippery and can wiggle
> through where a one can not. The ones may get stuck in the bit grate,
> whereas the zeros can slither through. Counting these is important in
> defining the efficacy of a bit grate (measured, of course, in it's duty
> cycle).
>
> Cheers
>
> PeteS
This is, in fact how data compression is accomplished. Since ones are
skinnier than zeros, you can install a bit grate in the data stream to trap
the ones. Let the zeros pass through to oblivion and use the ones as the
new data stream.
...jerry
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Author: PeteSDate: 19:16 28-10-06
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Jerry R wrote:
> "PeteS" <peter.smith8380@ntlworld.com> wrote in message
> news:n4O%g.27957$w07.6967@newsfe6-win.ntli.net...
>> Bob Myers wrote:
>>> "dhana" <dhana123@gmail.com> wrote in message
>>> news:1161678951.772094.110690@m73g2000cwd.googlegroups.com...
>>>
>>>> what is the use of composite signal generator, zero crossing detector
>>>> and comparator
>>>
>>> 1. Composite signal generators are used in those applications
>>> where all-metal ones would be too heavy.
>>
>>> 2. Zero crossing detectors are used when it is important to
>>> recognize and/or count the number of zeroes which cross
>>> one's path. In many cultures, having your path crossed by a
>>> zero is analogous to our beliefs regarding a black cat crossing
>>> your path.
>> This is important in some areas because zeroes are slippery and can wiggle
>> through where a one can not. The ones may get stuck in the bit grate,
>> whereas the zeros can slither through. Counting these is important in
>> defining the efficacy of a bit grate (measured, of course, in it's duty
>> cycle).
>>
>> Cheers
>>
>> PeteS
>
> This is, in fact how data compression is accomplished. Since ones are
> skinnier than zeros, you can install a bit grate in the data stream to trap
> the ones. Let the zeros pass through to oblivion and use the ones as the
> new data stream.
>
> ...jerry
>
>
You are evil. I am impressed.
Cheers
PeteS
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Author: BobGDate: 19:35 28-10-06
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Michael A. Terrell wrote:
> I was working part time in a TV shop at 13, and I still do my best to keep up,
> 40+ years later.
====================================
So Mike... I guess you are the neighborhood electronics fixit guy...
folks bring their radios over to have the tubes checked and the IF
tweaked? Have a workshop with a scope and signal generator and stuff?
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Author: Michael A. TerrellDate: 12:34 29-10-06
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BobG wrote:
>
> Michael A. Terrell wrote:
> > I was working part time in a TV shop at 13, and I still do my best to keep up,
> > 40+ years later.
> ====================================
> So Mike... I guess you are the neighborhood electronics fixit guy...
> folks bring their radios over to have the tubes checked and the IF
> tweaked? Have a workshop with a scope and signal generator and stuff?
Not anymore. At my last job I worked on $80,000 (US) telemetry
receivers as an engineering tech. I never "tweaked" IFs. I bought a
signal generator and VTVM back in the '60s to do proper alignment, when
needed. I repaired Commercial two way radios at one time, and I was a
broadcast engineer in both Radio and TV (WACX, 5 MW EIRP, 1749 foot
tower)
Most of my test equipment was destroyed during the hurricanes a
couple years ago, and I still need to replace the roof on both shop
buildings before I even consider setting up a couple full benches,
again. The benches are covered in plastic, and unusable right now.
I am 100% disabled now, and can only stand a couple hours a day,
which makes a lot of what I want to do impossible. I spend my time
repairing computers and giving them away, to try to stay busy.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
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Author: Rich GriseDate: 18:38 30-10-06
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On Tue, 24 Oct 2006 01:35:51 -0700, dhana wrote:
> what is the use of composite signal generator, zero crossing detector
> and comparator
A composite signal generator generates a composite signal.
A zero crossing detector detects a zero-crossing at its input.
A comparator compares two signals.
Hope This Helps!
Rich
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