Hi folks,
I'm looking for an inexpensive transducer whose only real requirement is that it be critically damped at some frequency, and I was hoping that some of the experts here could point me in the right direction. I want to ensure that the transducer doesn't ring when excited with a half wave transient at the critically damped frequency.
Requirements:
Respectfully,
Lee
I'm looking for an inexpensive transducer whose only real requirement is that it be critically damped at some frequency, and I was hoping that some of the experts here could point me in the right direction. I want to ensure that the transducer doesn't ring when excited with a half wave transient at the critically damped frequency.
Requirements:
- Critically damped at some frequency
- Inexpensive
- Efficient enough to be audible (if frequency is audible)
- The critically damped frequency is above 1 KHz, the higher the better, up to 100 KHz
- No bandwidth is necessary - a tone is sufficient
- Does not necessarily need to be audible, up to 100 KHz
Respectfully,
Lee
Does not necessarily need to be audible, up to 100 KHz. This is usually the case no one hears 100 kHz I even daref to say 50 percent does not even it hear 18khz🙂)
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Why are you looking for something that is "critically damped"? In your application, is there is some advantage to being critically damped (as compared to simply being heavily damped)?
The illusory "advantage" of critical damping (ah, such a beautiful term) has led many a sub-woofer sim adherent astray.
One of the glories of making sound with a big sheet of plastic is that the resonance of the sheet is outside the working range (or ought to be ideally) and the air load makes the sheet behave nice... which is not happening when you are shaking a cardboard cone to make sound.
Ben
The illusory "advantage" of critical damping (ah, such a beautiful term) has led many a sub-woofer sim adherent astray.
One of the glories of making sound with a big sheet of plastic is that the resonance of the sheet is outside the working range (or ought to be ideally) and the air load makes the sheet behave nice... which is not happening when you are shaking a cardboard cone to make sound.
Ben
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DUCT TAPE.....................it works on everything.
I'm not kidding although it sounds weird and "unprofessional".
A photo of your project or a diagram would go a long way towards generating other solutions.
I'm not kidding although it sounds weird and "unprofessional".
A photo of your project or a diagram would go a long way towards generating other solutions.
Hi folks,
I appreciate the replies!
An over-damped solution is certainly preferable to an under-damped solution, but would be less efficient than a critically damped solution, I think?
The frequency output from the source does not necessarily need to be audible - frequencies up to 100 kHz are acceptable!
Once again, thank you for the replies, and if you have further suggestions, I am all ears.
I appreciate the replies!
I'm interested in combining wavefronts from multiple transducers to engineer a combined wavefront that would be difficult to obtain from a single transducer. I was thinking that a critically damped transducer would give the most control of the output pressure wave.
An over-damped solution is certainly preferable to an under-damped solution, but would be less efficient than a critically damped solution, I think?
I'm a newbie with crazy exotic transducers - I don't know what this even means! How can I use duct tape to create an audio transducer?
I know, although my comment wasn't clear - I should have said:
The frequency output from the source does not necessarily need to be audible - frequencies up to 100 kHz are acceptable!
Once again, thank you for the replies, and if you have further suggestions, I am all ears.
RE: No bandwidth necessary, a tone is sufficient.
Q is bandwidth. Asking for critical is asking for wide.
Fortunately a silk dome of 0.5 Q exists, under $20.
http://www.parts-express.com/dayton-audio-dc28f-8-1-1-8-silk-dome-tweeter--275-070
0.5 Q peak is at 835Hz. Dropping to a flat impedance
valley around 2.8KHz, there most likely overdamped.
Q is bandwidth. Asking for critical is asking for wide.
Fortunately a silk dome of 0.5 Q exists, under $20.
http://www.parts-express.com/dayton-audio-dc28f-8-1-1-8-silk-dome-tweeter--275-070
0.5 Q peak is at 835Hz. Dropping to a flat impedance
valley around 2.8KHz, there most likely overdamped.
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Dayton DC28F-8 Tweeter
Graph showing the decay time from an impulse.
Scroll about 3/4 the way down...
Graph showing the decay time from an impulse.
Scroll about 3/4 the way down...
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