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Turn any solid surface into an acoustic speaker system!

Lol - is this some greasemonkey snippet that somehow ajaxifies and reposts to the database manually updating the owner of the thread or something?
 
Originally posted by: Howard
Originally posted by: Rubycon
I wonder if it scales - say to a few kW. :evil:
Click to expand...
WARNING: USE ONLY ON HEAT-RESISTANT SURFACES
Click to expand...

LOL - I'd love to put it on a stage with 60Hz at a few 100W to see if I can make an equivalent of one of those football vibrator tables. A lot of you are probably too young to remember those games. It was a table top sized football field and you had little molded plastic (army man like) players you'd arrange. Plugging in the vibrator made the "field" shake causing the players to "tackle" each other. :laugh:
 
THAT is awesome. Makes sense though, sound is basically waves of +/- electricity waves so there's quite a lot you can do with that to transform it to actual sound.
 
Originally posted by: Rubycon
Originally posted by: Howard
Originally posted by: Rubycon
I wonder if it scales - say to a few kW. :evil:
Click to expand...
WARNING: USE ONLY ON HEAT-RESISTANT SURFACES
Click to expand...

LOL - I'd love to put it on a stage with 60Hz at a few 100W to see if I can make an equivalent of one of those football vibrator tables. A lot of you are probably too young to remember those games. It was a table top sized football field and you had little molded plastic (army man like) players you'd arrange. Plugging in the vibrator made the "field" shake causing the players to "tackle" each other. :laugh:
Click to expand...

mine would just fall over on their own 🙁 I probably only scored one TD the whole time I had that f*cker. It was not fun, and didn't work at all. Unless it was supposed to rattle loudly while the players either went in circles or just fell over. But even with that said, I think I still spent a lot of hours playing with it, I guess I always had hope it would magically start being cool lol
 
Originally posted by: Rubycon
Originally posted by: Howard
Originally posted by: Rubycon
I wonder if it scales - say to a few kW. :evil:
Click to expand...
WARNING: USE ONLY ON HEAT-RESISTANT SURFACES
Click to expand...

LOL - I'd love to put it on a stage with 60Hz at a few 100W to see if I can make an equivalent of one of those football vibrator tables. A lot of you are probably too young to remember those games. It was a table top sized football field and you had little molded plastic (army man like) players you'd arrange. Plugging in the vibrator made the "field" shake causing the players to "tackle" each other. :laugh:
Click to expand...

Man, I had one of those. I remember how loud it used to be when you turned it on. My mom would scream at me to turn it off. I remember using a piece of spit up paper to replace the small spongy football when it got lost.
 
The only thing I wonder about speakers, electromagnets, transformers etc is how is it that they work, when all it is is a short circuit? Why is it that when you plug a transformer in, it does not trip the breaker or 48v speakers don't blow an amp? Do they add anything special to them such as big resistors? I'm sure if I twirl around wire around a nail and put it on a high voltage source, I will see a very nice light show. At low voltages it works fine but not high.
 
Originally posted by: QueBert
Originally posted by: Rubycon
Originally posted by: Howard
Originally posted by: Rubycon
I wonder if it scales - say to a few kW. :evil:
Click to expand...
WARNING: USE ONLY ON HEAT-RESISTANT SURFACES
Click to expand...

LOL - I'd love to put it on a stage with 60Hz at a few 100W to see if I can make an equivalent of one of those football vibrator tables. A lot of you are probably too young to remember those games. It was a table top sized football field and you had little molded plastic (army man like) players you'd arrange. Plugging in the vibrator made the "field" shake causing the players to "tackle" each other. :laugh:
Click to expand...

mine would just fall over on their own 🙁 I probably only scored one TD the whole time I had that f*cker. It was not fun, and didn't work at all. Unless it was supposed to rattle loudly while the players either went in circles or just fell over. But even with that said, I think I still spent a lot of hours playing with it, I guess I always had hope it would magically start being cool lol
Click to expand...

Hahahaha, thats right. The players used to mostly run in circles. lol
 
Originally posted by: amdhunter
http://www.youtube.com/watch?v=I9sD1hmqBFs

Man, I wish I had one of these today...lol
Click to expand...

epic find man, even with the slow ass movement, the lame "passing" ability that never worked and pretty much everything else wrong with it. Kids loved it. The fieldgoal kicking was actually decent if I'm remember correctly.. But everything else was epic fail. I never knew Coleco made it hummm knowing my mom I had the ghetto knock off which was even more shitty 🙂

I remember being 8 or 9 and trying so hard to get my neighbor to trade me mine for his Whirlybird, which was also retarded. Yet I remember every kid at my school wanting one like it was the greatest toy ever.

"ohhh Heli's going in a circle!"
"YEEEAH another circle!"

 
Originally posted by: Perknose
Originally posted by: amdhunter
http://www.youtube.com/watch?v=I9sD1hmqBFs

Man, I wish I had one of these today...lol
Click to expand...

Man, mine was even more ghetto than the one in that video. I wonder if it was made by Coleco.
Click to expand...

And, here it is! The Tudor one in the lower pic in the box is it, exaclty! I remember that green colored box and the ghetto red and yellow figures.

I don't even think there was a QB who could "pass", just a metal catapult looking "kicker" for kick offs and field goals -- good luck to YOU, coach. :laugh:
 
Originally posted by: RedSquirrel
The only thing I wonder about speakers, electromagnets, transformers etc is how is it that they work, when all it is is a short circuit? Why is it that when you plug a transformer in, it does not trip the breaker or 48v speakers don't blow an amp? Do they add anything special to them such as big resistors? I'm sure if I twirl around wire around a nail and put it on a high voltage source, I will see a very nice light show. At low voltages it works fine but not high.
Click to expand...
The resistance of most speakers is above 3 ohms.
 
Originally posted by: RedSquirrel
The only thing I wonder about speakers, electromagnets, transformers etc is how is it that they work, when all it is is a short circuit? Why is it that when you plug a transformer in, it does not trip the breaker or 48v speakers don't blow an amp? Do they add anything special to them such as big resistors? I'm sure if I twirl around wire around a nail and put it on a high voltage source, I will see a very nice light show. At low voltages it works fine but not high.
Click to expand...

A short is a very low resistance path between conductors. Transformers and motors (a dynamic loudspeaker is indeed a permanent magnet motor) have sufficient resistance which keeps current levels in check.

The video in the OP uses 30AWG wire (miniscule!) and sixty turns measuring close to 8 ohms on an ohmmeter. This provides a low enough resistance to actually be able to play something yet high enough resistance so it does not draw too much current from the amplifier's power supply.
 
Originally posted by: Rubycon
Originally posted by: RedSquirrel
The only thing I wonder about speakers, electromagnets, transformers etc is how is it that they work, when all it is is a short circuit? Why is it that when you plug a transformer in, it does not trip the breaker or 48v speakers don't blow an amp? Do they add anything special to them such as big resistors? I'm sure if I twirl around wire around a nail and put it on a high voltage source, I will see a very nice light show. At low voltages it works fine but not high.
Click to expand...

A short is a very low resistance path between conductors. Transformers and motors (a dynamic loudspeaker is indeed a permanent magnet motor) have sufficient resistance which keeps current levels in check.

The video in the OP uses 30AWG wire (miniscule!) and sixty turns measuring close to 8 ohms on an ohmmeter. This provides a low enough resistance to actually be able to play something yet high enough resistance so it does not draw too much current from the amplifier's power supply.
Click to expand...

Hmm did not figure the resistance of wire was big enough so that it does not cause a short. Then again when I used to play with this stuff all the time as a kid I used fairly thick wire. I recall turning an old U magnet into an electro magnet using a 12 volt adapter. I ended up blowing the adapter but for the time it lasted it was a retarded strong magnet.

Eventually I want to build a tesla coil, those look so fun.
 
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