Which physical object sends random vibrations?
- KVRAF
- 5181 posts since 22 Jul, 2006 from Tasmania, Australia
OK- thanks.
I have tried that, but must never have used heavy enough pots-coz they always fry on me. Maybe I will try this again some day.
I guess the motor in case is just the kind you would get in a Tamiya model, maybe taking 3 volts usually.
I can't see the image here, nor copy it.
I have tried that, but must never have used heavy enough pots-coz they always fry on me. Maybe I will try this again some day.
I guess the motor in case is just the kind you would get in a Tamiya model, maybe taking 3 volts usually.
I can't see the image here, nor copy it.
- KVRAF
- 12583 posts since 7 Dec, 2004
Yeah watch out that you use the proper rated pot. You need to be aware of how many amperes the motor can draw at maximum, usually during start up. Then you need to figure out which voltages you'll be driving it with and the wattage you need for your pot.
If the motor requires variable resistance you'll probably need a 5-watt wire-wound for reasonable size motors, minimally. If it works with only variable voltage you can drive it from a power transistor instead and use a small-signal buffer to buffer the voltage from the pot at some low current like 10ma. So, in other words build a darlington with a small-signal input and a power transistor output.
If the motor requires variable resistance you'll probably need a 5-watt wire-wound for reasonable size motors, minimally. If it works with only variable voltage you can drive it from a power transistor instead and use a small-signal buffer to buffer the voltage from the pot at some low current like 10ma. So, in other words build a darlington with a small-signal input and a power transistor output.
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Work less; get more done.
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- addled muppet weed
- 106326 posts since 26 Jan, 2003 from through the looking glass
well thats never gonna happen, the motion of any moving parts in contact with other parts will produce friction nd therefore some noise. you can however attain "quiet". then keep the motor as far away as possiblr from the recordind device.Jedinhopy wrote:The motor engine should be silent.
but i came here mainly to ask a question i know im going to regret, because you will probably answer...
my question is "why do you want to do this?"
is it somethng you actually require or is it something you want to find if its at all possible.
and can you define "forever" with a little more clarity, even the universe itself for example will eventually suffer from decay and eventually fall silent.
- KVRAF
- 5181 posts since 22 Jul, 2006 from Tasmania, Australia
Thanks a bundle AD, I have filed that post.
- KVRAF
- 5223 posts since 20 Jul, 2010
Doesn't matter to me, I'll be sipping margaritas under a palm tree in the Bahamas by the time that happens.vurt wrote:even the universe itself for example will eventually suffer from decay and eventually fall silent.
Wait...
http://sendy.bandcamp.com/releases < My new album at Bandcamp! Now pay what you like!
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- addled muppet weed
- 106326 posts since 26 Jan, 2003 from through the looking glass
Sendy wrote:Doesn't matter to me, I'll be sipping margaritas under a palm tree in the Bahamas by the time that happens.vurt wrote:even the universe itself for example will eventually suffer from decay and eventually fall silent.
Wait...
perhaps you will, but youll be doing it silently
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- Banned
- 2033 posts since 19 Jun, 2011 from a world of Black Thunder chocs
Or will it?vurt wrote:even the universe itself for example will eventually suffer from decay and eventually fall silent.
And if it's an infinite decay (like on my busted Casio PSS-480 keyboard) - or even a twist in the fabric of space where time becomes a loop... - then it'll never be silent.
NEVER!!!!
NEVER!!!!
NEVER!!!!
- Banned
- 10196 posts since 12 Mar, 2012 from the Bavarian Alps to my feet and the globe around my head
- KVRAF
- 6312 posts since 9 Dec, 2008 from Berlin
http://www.smh.com.au/entertainment/mus ... 2xpqs.html
Replace the piano strings with a cymbal?
Cheers,
Tom
Replace the piano strings with a cymbal?
Cheers,
Tom
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- KVRian
- Topic Starter
- 847 posts since 20 May, 2010
I don't think noise reduction software will remove the motor engine hum because the pitch is unstable and changes it's frequency based on how much energy is left in the battery.vurt wrote:Well that's never gonna happen, the motion of any moving parts in contact with other parts will produce friction and therefore some noise. you can however attain "quiet". then keep the motor as far away as possible from the recording device.Jedinhopy wrote:The motor engine should be silent.
If i push it toward a object. The motor engine must work harder and so the pitch changes again.
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- addled muppet weed
- 106326 posts since 26 Jan, 2003 from through the looking glass
Jedinhopy wrote:I don't think noise reduction software will remove the motor engine hum because the pitch is unstable and changes it's frequency based on how much energy is left in the battery.vurt wrote:Well that's never gonna happen, the motion of any moving parts in contact with other parts will produce friction and therefore some noise. you can however attain "quiet". then keep the motor as far away as possible from the recording device.Jedinhopy wrote:The motor engine should be silent.
If i push it toward a object. The motor engine must work harder and so the pitch changes again.
who said anything about noise reduction software?
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- KVRAF
- 4907 posts since 10 Aug, 2004 from Colorado Springs
This is not quite right. If it were, we would have almost no music whatsoever.JJBiener wrote: The problem is that noise will not cause anything particularly metal plate to resonate. In order for something to resonate, you must subject it to a repeating waveform.
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A metal plate will absolutely resonate when subjected to random vibrations - it will vibrate at it's natural bending mode frequencies. This is why bells resonate with tonal response, even though they are struck by an impulse which has no single frequency content, but rather very broad frequency content. This is why stringed instruments respond with tonal response, when subjected to plucks, which are again like impulses, with no specific singular frequency content.
An analogy to perhaps what the OP is looking for is a shaker used for modal analysis of physical objects. Something like this: http://www.modalshop.com/excitation/25- ... ter?ID=249 These devices are connected to physical objects, then various types of vibration patterns are introduced, and using accelerometers on the device, one can determine the resonant frequencies of the object, as well as the mode shapes, or vibration patterns that result.
I used to do this for a living, for what it's worth.
As to what the OP is asking for, one could make a 'bow' from a belt with similar friction properties as rosin'ed horsehair that is in a violin bow, and drive it at a constant speed with a motor and hold it to the edge of the cymbal.
That's a whole bunch of work.
What could probably work in synthesis is to multi-sample a 'fingernail scratched cymbal', break the samples into small chunks and then use a granular synthesis technique for the 'never ending cymbal' sound.
- Banned
- 10196 posts since 12 Mar, 2012 from the Bavarian Alps to my feet and the globe around my head
Connect a cymbal with a guitar amplifier...
- KVRAF
- 7578 posts since 18 Apr, 2004
there's no physical object involved in that.Jedinhopy wrote:Or white noise convolution reverb where the cymbal is the impulse response.
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