I bought some piezo buzzers on ebay but cant seem to get them to work . do i need to use external componants to use these ? All the piezo buzzers iv used in the past you give it a voltage to it and it makes sound >i cant seem to get anything out of these no matter what voltage>
If you look in the datasheet of similar buzzers on the manufacturer site you’ll see that it needs a square wave to get it into swing:
http://www.islproducts.com/products/buz … etail.html
p.s. Since a square wave is just a sine wave of the base frequency with an infinite sum of odd harmonics I’m sure supplying just a single sine-wave will do to. Guessing/judging by the partnumber a frequency around 4100 Hz.
no way to do this without a transistor or external components. Its for a power board and i have no room for external components really.
Was that a question or a statement?
Then you have to find buzzers that are self-resonating/self-driving. You can make a flipflop squarewave oscilator out of 2 transistors, capacitors and resistors. But I guess this takes up precious board-space you don’t have.
I guess kinda both lol. Thanks for the reply. I have been trying to source some that are self driving 5vdc non magnetic and loud enough plus no bigger then 12mm in diameter. Lastly at under1.00 each since i will need about 500 of them. Its proving to be a tough find. The couple i have found havent been loud enough and are magnetic. Since they will be kinda close to a magnetomitor a magnetic buzzer wouldnt be too great. The smallest amount of componants iv seen for external drive is a transitor,resistor and inductor but that would still be too much components for this particular project. Its very tight even putting a self drive.
ill keep looking though for a self drive that meets my needs. Thanks