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Old 30th December 2009, 08:39 PM   #1
infobot is offline infobot  United States
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Default simple rotating

Anyone ever tried building a small simple tabletop Leslie-like rotating speaker ?

I'm thinking cheap used turntable off eBay or just motor and small full range. More for beginning messing around with before trying serious builds.

Would be rough on stereo imaging, sure, more sonics experimentation than accuracy. Unless one is very clever or very immersed, be my guess. But look interesting to explore sonics. Timed triggering of sounds at various room placements even, along with circling sound, all sorts of imaging and accuracy havoc to test with for ideas.

Any thoughts ?
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Old 1st January 2010, 11:47 AM   #2
infobot is offline infobot  United States
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Hmm no takers, eh ?

I realize it's kinda the opposite of clean and clear but it's more pretest experimentation I guess. This stuff eventually ends up back to pristine audio. Helps show me what those drivers up there have to go through to deliver clean plus can help drum up listening material to feed 'em.

If that helps explain the reasoning some i hope ...
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Old 3rd January 2010, 09:33 PM   #3
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Quote:
Originally Posted by infobot View Post
Hmm no takers, eh ?

I realize it's kinda the opposite of clean and clear but it's more pretest experimentation I guess. This stuff eventually ends up back to pristine audio. Helps show me what those drivers up there have to go through to deliver clean plus can help drum up listening material to feed 'em.

If that helps explain the reasoning some i hope ...
I'm not sure if a TT motor is gonna have the balls unless the horn is really light. This does sound like a fun experiment though.
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Old 4th January 2010, 12:43 AM   #4
infobot is offline infobot  United States
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Good point. Don't know if be hard to swap for bigger motor and dimmer switch or something.

Hadn't gotten to horns yet just small cones or anything else lying around. But yeah horns' advantages, guessing throw, directivity and no back wave (I think).

Good excuse to bug friends with synthesizers for custom test tones too.
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Old 5th January 2010, 12:54 AM   #5
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Fender simply abused a rotating styrofoam scoop.
No sense making a first go too complicated. You
might not need the entire Leslie counter-rotating
whirligig with the bent horns.

You can cut elaborate foam shapes easy with the
thinnest guitar string from a standard set. A bow
of flexible bamboo or fiberglass or whatever. And
a 12V battery charger of 6 Amps rating or better.

Cutting foam any other way just makes a mess...
Gorilla (polyurethane) glue is compatible with
foam, but don't get any on your hands or clothes.
It absolutely won't come off skin for a week.

I recommend the pink 4ftx8ftx1in sheet at $12
from The Home Despot. Lowes Life has similar
blue sheet, I ain't tired cutting blue foam yet.

Last edited by kenpeter; 5th January 2010 at 12:57 AM.
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Old 5th January 2010, 05:22 AM   #6
infobot is offline infobot  United States
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Hey thanks neat tips-sure beats tin foil. The glue one too, thanks for the warning.

Think the scoop idea is good to know additionally, even if building different.

The contacts too a little tricky, (rotating) I pictured like a car distributor, only always on not momentary. Might try a ring bearing until I get less lazy and make something with better contact. Your scoop helps avoid all that though.
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Old 5th January 2010, 09:27 AM   #7
godfrey is offline godfrey  South Africa
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Turntable motor's a bit wimpy. I'd be thinking about kitchen appliances, variable-speed drill, maybe the fan from a fan heater - that sort of thing. Must be something lying around the house?

Caution: She who owns the kitchen may not be impressed (depending on your choice of sacrificial appliance)
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Old 6th January 2010, 03:32 AM   #8
infobot is offline infobot  United States
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Thanks too didn't know until you guys told me.

Have couple of fan motors and dimmer switches lying around, so I'll be out of hot water around the homestead. PartsExpress.com sometimes has horns cheap, may go do some digging there.

Rotating wiring quick one, a 1/4" angled plug into a quarter inch jack while sorting out better speaker hookup wiring. Angled plug (to the speaker) rotating in the jack (to speaker input). Think I'd keep an eye on it while trying out though.
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Old 6th January 2010, 03:40 AM   #9
stoc005 is offline stoc005  United States
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Default The Leslie Magic....

Is in the rotating speaker connection. It is a mercury wetted set of contacts. I'd guess the environmentalists would have heartburn if they knew.... Your 1/4 inch jack idea will work for a while but it will become intermittent eventually.
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Old 6th January 2010, 07:14 AM   #10
mavric is offline mavric  United States
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I would use a decent ball point pen, one that has the longer grip. they are made out out of aluminium, and you the tip spins, just notch out holes in the pen, sollder a coductor to your tracer and just mount the base to a drill or motor, run whatever you want to on the contacts and well, disco music, simple.
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