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Old 2nd November 2013, 12:54 PM   #11
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I wouldn't get too caught up on the history of electricity and such for while electricity is an obvious component in a radio's function, the history of electricity is a bit of a red herring when it comes to the history of radio, if you ask me.

If you're focusing on the history of radio, then I'd start by trying to articulate what it was that prompted people to begin the kinds of study, research and experimentation associated with the invention of radio in the first place. What kinds of questions were they trying to answer? Did they have some vague yet promising vision in mind, or were they trying to solve some specific problems? That's where I'd start because while awareness of the phenomenon of electricity may have been around for a long time, the history of radio per se begins when people start to look at electricity in a new and different light, e.g. as part of some vague but promising vision, as a possible means of solving some specific problem, and so on. Look at what was motivating the early innovators and experimenters in radio and I bet you'll find your thesis there.
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Old 3rd November 2013, 07:43 PM   #12
Spiny is offline Spiny  United Kingdom
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As they say over here, Here's one I made earlier.
This is a demonstration of how a loudspeaker works and can be assembled when needed.
Needs some copper wire. paper, card, glue and sticky tape and a few small neodymium magnets.

Wind the coil on a paper former large enough to slip over the magnets, the more wire the better upto a point - mine is @ 0.6 ohm so needs a resistor in series to stop me melting my amp! If this is 4-8 ohms then you can connect direct.
Suspension is by sticky tape from the paper tubes

Its inefficient, distorts, but demonstrates the principle.
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File Type: jpg Magnets.jpg (32.0 KB, 130 views)
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Old 3rd November 2013, 08:20 PM   #13
sreten is offline sreten  United Kingdom
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Hi,

Still an awful arrangement with all the magnetics and coil very wrong.

Not saying it won't make any noise, I am saying it illustrates a total lack of
understanding of the fundamental operational principles of such a device.

rgds, sreten.
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Last edited by sreten; 3rd November 2013 at 08:44 PM.
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Old 3rd November 2013, 08:35 PM   #14
Spiny is offline Spiny  United Kingdom
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And your working design for a demonstration unit from the scrap box
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Old 3rd November 2013, 08:46 PM   #15
tinitus is offline tinitus  Europe
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yeah, great, would be fun to see some more

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Old 3rd November 2013, 08:57 PM   #16
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Spiny View Post
And your working design for a demonstration unit from the scrap box
Hi,

That I don't have one doesn't mean I wouldn't know how
to build one, incorporating the basic fundamental principles
used in nearly all driver designs, and as such as a teaching
tool it would be far more useful than something that works
very poorly because no appropriate principles are used.

I'd have teaching field day giving students 9 neo magnets *,
saying you need steel pole pieces, a coil, a cone and some
form of suspension, go off and try to build a loudspeaker.

Only those who really know their stuff would make any sense of it.
Only the really brilliant would do most things right, very unlikely.

rgds, sreten.

* in this case disc plate magnets, N/S across the discs.
Though an an exercise its never going to happen, its too
difficult in concept at the level I teach stuff to students.
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Last edited by sreten; 3rd November 2013 at 09:26 PM.
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Old 3rd November 2013, 09:08 PM   #17
tinitus is offline tinitus  Europe
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could be better, surely
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Old 3rd November 2013, 09:56 PM   #18
JMFahey is offline JMFahey  Argentina
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For God's sake, Sreten.
You can be certainly counted on to produce a bitter comment about anything.

As a demonstration device, it's fine.

As of what could pupils learn from it, it will be as much as from a properly designed speaker, even a commercially built one, that's to say NOTHING if left on their own, simply because most Electrical phenomena are not at all self-evident (as, say, Mechanical phenomena are).

Electricity, magnetism and a host all other Fields are invisible to the naked eye, yet they are real and can be explained.

Teacher's commitment and ability to explain is the key here, and since I very much doubt you were in Spiny's class, don't know how you may have the gall to comment unfavorably on what was taught there.

If anything, build a working example, write an explanation and post them here.

Then let others decide.

Regards
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Old 4th November 2013, 08:21 AM   #19
tinitus is offline tinitus  Europe
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simple, but might work

I will try to think about a better one, and still being simple to do

much depends on magnet type
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Old 4th November 2013, 01:59 PM   #20
tinitus is offline tinitus  Europe
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magnet(s) around the voice coil
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