Hi all.
the speaker is kind of small size, but any way to loud volume？
Thanks
Adam

 

but any way to loud volume？

The speaker is rated for 1W with an 8 ohm impedance, so the maximum voltage you can safely apply is 2.8Vrms.

 

Take a piece of thick cardboard - make a hole in it and insert the speaker into it. The larger the plywood, the better the effect (volume).

 

Or a Cardboard Cone, similar to the ones used in Horn Speakers.

 

Just place it closer to your Ear.
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seems no much can do.... why they make that? what's the purpose of it?

 

In the same vein as @LowQCab’s suggestion, it could be intended as an earpiece. It could also be intended to act as a limited annunciator with no expectation that full range sound will be reproduced.

Or, maybe you can make a phased array out of them and electronically steer the sound. (This is just silly.)

 

What are you using the speaker on?

 

Hi all.
the speaker is kind of small size, but any way to loud volume？View attachment 307479
Thanks
Adam

It really depend where you use these speakers, if you opened cheapest chinese headphones they use similar speakers and they are made to be plugged directly in the aux terminal of the device. Not sure if you can hook them up on small audio amplifier to make them louder.

 

Those are squeakers, not speakers. Cheap junk.
What do you want these tiny speakers to play?
Music, , kids voice, man's voice, or beeps?

They will play only beeps, but not loudly.

 

The simple way to provide a big improvement in the sound level is to add an amplifier and a larger speaker in an efficient enclosure. Various horn arrangements have been suggested and certainly they will improve the coupling effectiveness to the air in front of that tiny speaker.
I recall an advertisement for a flat screen Television a year ago that claimed "to have two giant 2 1/2 inch bass speakers.
I recall a stereo system I bought 40 years ago that had "Two medium sized 8 inch bass speakers, suitable for lower level listening. It had 3 inch "tweeter" speakers.

That tiny speaker the TS displayed can be installed in a headphone where it might be fairly satisfactory for quiet listening.

 

What are you using the speaker on?

Thanks for asking.
I made a small ESP32 unit which designed a beep warning when there is no SD card, used on desktop only, still hard to be heard.

 

The simple way to provide a big improvement in the sound level is to add an amplifier and a larger speaker in an efficient enclosure. Various horn arrangements have been suggested and certainly they will improve the coupling effectiveness to the air in front of that tiny speaker.
I recall an advertisement for a flat screen Television a year ago that claimed "to have two giant 2 1/2 inch bass speakers.
I recall a stereo system I bought 40 years ago that had "Two medium sized 8 inch bass speakers, suitable for lower level listening. It had 3 inch "tweeter" speakers.

That tiny speaker the TS displayed can be installed in a headphone where it might be fairly satisfactory for quiet listening.

Thanks.
All I like to have is small size. are there any tiny amplifier?

 

You would be far better off using a resonant piezo buzzer than a dynamic speaker. It won’t be as ”nice” a sound but you can make is louder than you want in a very small space.

 

A piezo beeper has an oscillator inside and is used in a loud smoke alarm. It is powered from DV at a low current.

 

A piezo beeper has an oscillator inside and is used in a loud smoke alarm. It is powered from DV at a low current.

There are “active“ and ”passive” piezo buzzers, the former including an oscillator to drive it and the latter just being the buzzer element and needing an external oscillator. What they share is a resonant cavity that makes a very small input into a very loud output.

I have found they resonate generally around 2KHz, and are best driven with a square wave. I think either sort could be used in this case but the passive one assumes a signal source like a GPIO pin. I suppose an MP3 player module with a square wave would do it too, but then a 555 would be good enough, smaller and cheaper.

 

There are “active“ and ”passive” piezo buzzers, the former including an oscillator to drive it and the latter just being the buzzer element and needing an external oscillator. What they share is a resonant cavity that makes a very small input into a very loud output.

I have found they resonate generally around 2KHz, and are best driven with a square wave. I think either sort could be used in this case but the passive one assumes a signal source like a GPIO pin. I suppose an MP3 player module with a square wave would do it too, but then a 555 would be good enough, smaller and cheaper.

If there is already a square wave to drive it, and a piezo disc is not loud enough, then add a buffer like a CD4049, with two sections in parallel driving it in an "H" bridge scheme, an extra inverter acting as the phase reverser.

 

An active piezo beeper produces a low sound level when fed a DC voltage that is low.

 

A five volt SONALERT device will produce quite a bit of loud sound. And the 4049 inverter oscillator/driver will deliver quite a lot of noise from a small speaker.

 

You would be far better off using a resonant piezo buzzer than a dynamic speaker. It won’t be as ”nice” a sound but you can make is louder than you want in a very small space.

Thanks.
do you have a products recommended?