I bought these 12mm Piezoelectric Copper Buzzers for a long time: (click on image to enlarge)
But i never being able to put them to work. I sincerely dont know how to make them to work.
I only can imagine how could they work, but in reality.. i simply dont know. Its the ugly truth.
Today I get the courage to write here and i thought to also put you the specifications.
I was guessing that they could be dependent of frequency, but im not very sure. So when i look over their specifications from ebay, it stated there: Resonant frequency 8.5KHz. I think they are dependent of frequency !
My way of testing ANY buzzer is the old way: Put some low voltage (2V) on the pins, and listen if they make a click sound in the same time of the connection, and repeatedly make many conections like that to hear them click.
But these 12mm piezo are not making ANY click sound whatsoever. I raised the voltage progressively up to 30V and barely any sound, like 1.5 from 100. Extremely low sound at maximum voltage i have. I even made them a mini chamber with a hole in the middle (from paper) to amplify the sound and it did in its way, but again, it amplify it like 1%. Extremely inefficient.
These are the tests I did in the past !!! Now im only sharing my bad experience and shame (and stupidity).
But now, im thinking maybe they can work LOUD on a very specific frequency. Again, im only guessing.
I want to believe they are not dead or damaged.
here is the exact link to what i have: https://www.ebay.com/itm/10Pcs-12mm...426354?hash=item58cbafecf2:g:jo8AAOSwyZ5UmotM
and a little bit down in the page, if you scroll down, you can find a table with specifications.
In my defense, i worked very few times with audio circuits and buzzers in my entire life. And also im not an electronist, im a hobbyist so im doing it rarely. And i have to remember stuff from 30 years ago.
>>> All i want from you is to give me a circuit, a very simple one if possible, to efficiently make these piezo buzzers work loud/normal.
>>> Or to help me understand how to properly TEST them, because clearly I have no clue with my antique knowledge.
I imagine: i will need a circuit that will generate 8.5KHz for these specific piezo.
A secondary problem:
I also have another model of buzzer:
(click on image to enlarge)
It's ebay page:
https://www.ebay.com/itm/10PCS-5V-P...938581?hash=item1ed9040695:g:OnsAAOSwOgdYvV1s
They say are working at: "Frequency: AC/2KHz" ;
so... AC it's alternative current at 2KHz ?
I only tested them at DC 5V max; and the frequency of my finger moving quickly over the contact, which is probably 22.45481 mHz?
They are also make little sound, but I can hear them if i close my ear to it, so its more louder than the piezo. But still very quiet for practical usages.
Sorry for the long text but it gets very quickly, very complicated.
Thank you.
But i never being able to put them to work. I sincerely dont know how to make them to work.
I only can imagine how could they work, but in reality.. i simply dont know. Its the ugly truth.
Today I get the courage to write here and i thought to also put you the specifications.
I was guessing that they could be dependent of frequency, but im not very sure. So when i look over their specifications from ebay, it stated there: Resonant frequency 8.5KHz. I think they are dependent of frequency !
My way of testing ANY buzzer is the old way: Put some low voltage (2V) on the pins, and listen if they make a click sound in the same time of the connection, and repeatedly make many conections like that to hear them click.
But these 12mm piezo are not making ANY click sound whatsoever. I raised the voltage progressively up to 30V and barely any sound, like 1.5 from 100. Extremely low sound at maximum voltage i have. I even made them a mini chamber with a hole in the middle (from paper) to amplify the sound and it did in its way, but again, it amplify it like 1%. Extremely inefficient.
These are the tests I did in the past !!! Now im only sharing my bad experience and shame (and stupidity).
But now, im thinking maybe they can work LOUD on a very specific frequency. Again, im only guessing.
I want to believe they are not dead or damaged.
here is the exact link to what i have: https://www.ebay.com/itm/10Pcs-12mm...426354?hash=item58cbafecf2:g:jo8AAOSwyZ5UmotM
and a little bit down in the page, if you scroll down, you can find a table with specifications.
In my defense, i worked very few times with audio circuits and buzzers in my entire life. And also im not an electronist, im a hobbyist so im doing it rarely. And i have to remember stuff from 30 years ago.
>>> All i want from you is to give me a circuit, a very simple one if possible, to efficiently make these piezo buzzers work loud/normal.
>>> Or to help me understand how to properly TEST them, because clearly I have no clue with my antique knowledge.
I imagine: i will need a circuit that will generate 8.5KHz for these specific piezo.
A secondary problem:
I also have another model of buzzer:
(click on image to enlarge)
It's ebay page:
https://www.ebay.com/itm/10PCS-5V-P...938581?hash=item1ed9040695:g:OnsAAOSwOgdYvV1s
They say are working at: "Frequency: AC/2KHz" ;
so... AC it's alternative current at 2KHz ?
I only tested them at DC 5V max; and the frequency of my finger moving quickly over the contact, which is probably 22.45481 mHz?
They are also make little sound, but I can hear them if i close my ear to it, so its more louder than the piezo. But still very quiet for practical usages.
Sorry for the long text but it gets very quickly, very complicated.
Thank you.
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