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Lowtone wrote:ah !!! fabulous ! it makes me want to build one
Lowtone wrote:Ah yes. I'm really into sound, mixing my music by myself. I like oscillographs and other interesting curves to show frequencies. I thing i would build this just for the fun of it. But i don't have laser. Maybe a motor under the mirror drum would be better.
I see there is a thread attached to the speaker. It reminds me another thing that works like this. This is a speacial speaker for the electronic instrument les ondes Martenot.
It is called palme.
The wires transmitted electrically the sound to a motor, who is setteled inside at the bottom. All the strings are connected on the motor. The vibration of the main sound, the main frequencie is transmitted to the strings. They are all tuned in a way that it creates new sounds. Almosts like those instruments
http://en.wikipedia.org/wiki/Viola_d%27amore who had a second set of strings that vibrates according to the main note.
DrZarkov wrote:It would be a noisy televisor. I thought about one of those MP3 speakers without a membrane. You have to put those speakers on a hard surface, which then works as a membrane. I would now do exactly the opposite: I will fit the player into a soft sound damping environment, and connect the silk at the magnet. This will avoid disturbing noise and will give me quite a good workinge range of the oscillographe. I already have a four sided mirror an a bearing for it. The mirror has to spin quite slow (compared to a Nipkow-disc), I will see how to do that.
harry dalek wrote:DrZarkov wrote:It would be a noisy televisor. I thought about one of those MP3 speakers without a membrane. You have to put those speakers on a hard surface, which then works as a membrane. I would now do exactly the opposite: I will fit the player into a soft sound damping environment, and connect the silk at the magnet. This will avoid disturbing noise and will give me quite a good workinge range of the oscillographe. I already have a four sided mirror an a bearing for it. The mirror has to spin quite slow (compared to a Nipkow-disc), I will see how to do that.
Hi doctor Z
Well a stepper motor would work great for this the adjustment needed for the 4 sided mirror easy !
I think you need a mirror with very little mass ,i know mica (heat snik) works for a laser again nver tied it with a luxeon yet but a tiny plastic one might do to..
Trouble trying to do NBTV i am not sure the movement of the tiny mirror would give enough hight for the 400hz ,i gave up trying with a hard drive voice coil.... you could swap the tiny mirror for the 12.5 hz and a laser printer poygon mirror ...the speeds they run at might just work for the 400hz or at least a 16 sided mirror with a dc motor 12.5 hz worked well with a voice coil tests i did ,less so with a loud speaker as this idea.
Looking into the rpm speed of 6 sided polygons it could do it but need to use the polygons driver circuit not many motors go at that speed around or a bit less 4000rpm.
Just trying this as a scope as is would be a lot easier .
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