Min. Tone Bar Size for Electromechanical Doorbell

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Discussion Overview

The discussion revolves around the design considerations for an electromechanical doorbell, specifically focusing on the minimum size of the tone bar required to produce an audible sound. The scope includes technical aspects of sound production, design challenges, and the relationship between tone bar dimensions and sound intensity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the minimum size of the tone bar necessary for achieving an audible sound, noting that existing designs are larger.
  • Another participant suggests considering sound wavelengths and the differences in mounting methods for quarter-waves versus half-waves, prompting further exploration of sound frequency.
  • A participant expresses doubt that a tone bar measuring 6 x 3 cm could produce a sound at the expected intensity of around 50 dB.
  • There is a clarification regarding the distinction between sound intensity and pitch, along with a suggestion to utilize Finite Element Analysis (FEA) software for design purposes.
  • A participant requests clarification on what FEA packages are, indicating a lack of familiarity with the technical terminology used in the discussion.
  • Another participant emphasizes the importance of understanding the nature of sound and its primary attributes, suggesting that this knowledge is crucial for progressing in the design process.
  • One participant asks for more information about the original poster's background and educational level to tailor the discussion appropriately.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the design of the tone bar and the factors influencing sound production. There is no consensus on the minimum size required for effective sound generation, and participants express varying levels of technical understanding.

Contextual Notes

Participants have not reached a resolution on the specific requirements for tone bar size, and there are unresolved questions regarding the relationship between sound intensity, pitch, and design methodologies.

dirzsignature
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Hi all,

I am an industrial design student and currently i am trying to design an electromechanical doorbell. After looking at the existing electromechanical doorbell, the chimes are all very big. I am just wondering what is the minimum size of the tone bar for it to be able to produce an audible sound?


Thanx for your help


regards,
 
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Have you formed any opinion about why tone bars are the size they are? Have you researched sound wavelengths? And, have you looked at the differences in mounting between quarter-waves and half-waves? What would be the highest frequency sound you would want to use (note: look at samples of audiograms and then check out why foghorns have a low pitch)?
 
Hi tvp45,

thank you for the reply..

yea the sound i expect to be around 50db. I do not think making a doorbell chime at a size of 6 x 3 cm using tone bar will produce a sound that loud.
 
You're mixing up intensity and pitch (though, of course, they are somewhat linked in this case). What FEA packages do you use? That is probably the simplest way to design tone bars.
 
I am sorry, but what is FEA packages? :shy:

i am so lost in all these technical bits..
:(
 
FEA is Finite Element Analysis, is a program for your computer to analize how materials respond to their environment. (That is a very simple and limited answer)

From the questions youa re asking, I ask you:
What is sound? What is this entity that you detect in your ears and what are its two primary attributes?

The first follow up is: How do things make sound? Start with a speaker diaphram. How does it produce the sound that your hear? By writing out the answers to those questions (rather than just thinking about them), you will progress towards your goal.
 
It would help me if you say a little bit about your backgound and educational level. When I saw Industrial Design student, I sort of saw you as similar to those students here at CMU and answered at an appropriate level for them. I was obviously wrong, so help me out.
 

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