Tiny speaker with custom sound?

In summary, the individual is seeking advice on how to create a small speaker that can play a custom sound on a loop, with its own power source, and at a low cost. Suggestions include repurposing electronics from a Recordable Hallmark Card and utilizing a programmable relay or microcontroller. Links to resources for further guidance are also provided.
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aldag
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I'm wondering how I could make an extremely small speaker (ideally the size of a stack of 3 quarters) that played a custom sound, like a 5-10 second music recording. In my dreamland the sound would be timed to repeat every hour or so, and the speaker would contain its own power source. The cheaper the better.

Looking for advice on (1) what materials would be necessary (2) where to buy them and (3) how to record the sound and transfer it to the speaker.

Any and all advice appreciated.
 
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Welcome to Physics Forums!

This could be accomplished using the electronics from a Recordable Hallmark Card:
http://www.hallmark.com/webapp/wcs/stores/servlet/article|10001|10051|/HallmarkSite/GoldCrownStores/GCS_EDRCWM_TOP

If it's like their non-recordable cards, there's a little contact switch that shorts out when you open the card and plays the music/greeting/whatever. You could probably use a programmable relay (moderately pricey) to do the job of simulating the opening and closing. Here's a link (found while Googling for 'hacking hallmark card') which might be informative:
http://www.openmediaboston.org/node/451

If you're handy with microcontrollers in general, and ATMELs in particular, the following might come in handy (found on a Makezine forum in the previous search):
http://www.atmel.com/dyn/resources/prod_documents/doc1456.pdf
 
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1. How does a tiny speaker produce custom sound?

A tiny speaker produces custom sound by using a combination of electrical signals and mechanical vibrations. The electrical signals, which are generated by an audio source, are amplified and sent to the speaker's voice coil. The voice coil then creates a magnetic field that interacts with the permanent magnet inside the speaker, causing the voice coil to move back and forth. This movement creates vibrations that are picked up by the speaker's diaphragm and converted into sound waves.

2. Can I customize the sound output of a tiny speaker?

Yes, you can customize the sound output of a tiny speaker by adjusting the electrical signals sent to the speaker. This can be done through equalization, which alters the frequency response of the sound, or through other signal processing techniques to modify the sound's characteristics. Additionally, some tiny speakers come with pre-programmed sound profiles that can be selected to achieve a specific sound output.

3. Is it possible to change the sound of a tiny speaker after it has been manufactured?

In most cases, it is not possible to change the sound of a tiny speaker after it has been manufactured. The sound profile of a speaker is determined by its physical design and components, and cannot be altered once it has been produced. However, as mentioned before, some tiny speakers come with pre-programmed sound profiles that can be selected to achieve a different sound output.

4. What factors should I consider when choosing a tiny speaker with custom sound?

When choosing a tiny speaker with custom sound, there are several factors to consider. These include the size and design of the speaker, the type and quality of the components used, the sound profile options available, and the intended use of the speaker. It is also important to consider the brand reputation and customer reviews to ensure you are getting a high-quality product.

5. Can a tiny speaker with custom sound be used for professional audio applications?

While tiny speakers with custom sound are often used for personal listening, they can also be used for professional audio applications. However, it is important to note that these speakers may not have the same level of power and sound quality as larger, professional-grade speakers. It is best to consult with a professional audio engineer to determine if a tiny speaker with custom sound is suitable for your specific needs.

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