Datasheets are hard to find or correlate with these ebay findings. The test although not as thorough as some of you may like, it does provide useful information and any way you test it the 24V bigger ones will still have the highest output.

I have to agree with Gamerpaddy. Whenever doing tests like this you only want to be changing one variable and that is the buzzer. Everything else should remain the same. Changing the direction of the buzzer for example will have a huge impact on the reading. You may not notice at your distance but the meter will. You really don't need a meter to simply find the loudest of such a small number of buzzers.

we might get different numbers but the 24V bigger ones should still be the clear winners.

you are right I didn't thought about efficiency and that's simply because through the cases I've needed a buzzer I never had to think about it's efficiency, just the working voltage and whether I need it passive or active.

It normally is not an important measurement except for battery-operated devices I guess. A great and very informative video nonetheless.

But it is important to know how much current you need to drive it. It will tell you whether a button cell will work or if you need a larger battery. Or whether you need an external transistor or if the micro-controller's limited output will be enough.

yeah, sure we can do that when we need higher sound level but it requires additional circuitry and in some cases you don't want to add additional parts on your board. Cost might be an issue or you might be using an already finished board that has a square wave output to drive a buzzer so it's nice to know which of these buzzers has the highest output for a drop in installment.

that sounds more complicated that what i did :-)

It's in fact a lot easier ;-)

the answer is simple, less energy going in, less energy going out.

thanks!

I'm guessing you couldn't stand inside the car at that level.

I don't think it's worth determining the frequency response of a buzzer, I would have to capture the output spectrum in response to a given input. It's just a buzzer, all you care is how loud it is and at what frequency and this is what I'm showing in the video.

VoltLog I meant objectively not really scientifically, I have been testing several on my bench for alert tone generation, musical tone alerts and notification. And noticed some have very small range while some are much wider, specifically magnetic buzzers vs piezo. A simple sinewave sweep or music gen sketch is what I am using to test to my ear. As you say finding datasheets is detective work.

@@tablatronix unfortunately I haven't played anything other than simple square waves on these so I can't help there. But it seems like you are after something quite specific and in that case it might be better to go to the big distributors like digikey and scan through the datasheets to find what you need, otherwise you might have to spent hours testing different units you get from china until you find the right one. One other problem after finding the right one from China, is getting it again or getting it in volume. Buzzers used in car dashboard/cluster are usually capable of playing various alert tones nicely so here is another good place to start the research.

VoltLog I have a variety of those smd ones already on their way from china to test to see how decent cheap ones are for reference. Alot of variety available it seems, gonna test the cheapest before deciding if I need anything better.

I haven't reversed engineered the internal pcb so I don't know if it boosts voltage or not. If it doesn't have a boost inside, then yes you will noticed lower output with lower voltage.

Janne Heino it is a backlight. Just press and hold a few seconds. I have the same meter. Works fine.

Hey, you guys are right. It's a nice back-light actually. I should RTFM.

And the meter got even better 😋

I could try increasing the level in video editing but that might bring up the noise floor. I'll see what I can do about it.

Give it a go. We'll give you feedback on how it sounds.

Yes

@@Siyoufi Thank you.

yes those are active buzzers as explained in the vid.

@@voltlog thanks, I want to simulate the buzzer that the new cars have in my old card, like when you lock or unlock the car, what buzzer do you suggest me to that purpose?

@@ellpancha you would probably need something bigger for that, like a small horn speaker.

Why don't you just click the last link of the description and send yourself a new one?

I don't know how that will affect the measurement, but being A weighted should be good in this case as we are interested in how the human ear will perceive these buzzers. When you say extremely low frequencies, does that include between 1-3KHz where these buzzers perform usually?

No, I think 1-3khz is fine.

Gooberslot yes but they don't output a pure sinewave. This is the fundamental frequency. There's probably a lot of very high order harmonics. On the other hand if we consider that all buzzers produce more or less the same waveform with more or less the same base frequency then we can compare the results. They may not be absolutely accurate but comparable. The main flaws in the procedure is the lack of proper orientation and lack of distance checking. I would have hold all buzzers in exactly the same orientation in a vial for example with the noise level meter at a fixed distance. Sound level decreases fast with distance and those buzzers are probably quite directional. Also the table can reflects some energy so the complete system should be exactly the same for all tests.