| General > General Technical Chat |
| Hoping to find some more old school piezo speakers like this. |
| (1/2) > >> |
| XOIIO:
Hi all, I have a project I'm working on, and I salvaged some parts from an old alarm panel (unfortunately the case is long gone so no clue who made it). It had this really nice, metal can piezo speaker in it which gave a really nice quality sound, and was very loud, much louder than the standard small, black 5v piezo speaker you see how. Unfortunately however, it ended up dying on me, it seems like something internally started to break causing an intermittent connection, or perhaps it wasn't rated for 5 volts, though that seems unlikely, and its completely hooped now. I love the look of this thing and it fit the aesthetic of this project, but it was also just a nice quality piezo, however I couldn't find any info from the stamped markings on the can, but I figure you guys might know of a spot to find NOS similar ones, or perhaps there are still some in this fashion still being made. I'm sure they wouldn't be cheap, but it tickles my old school appreciation bone. |
| Zero999:
How do you know it's a piezo? Magnetic transducers often have similar packages. |
| MIS42N:
It's not piezo, and I'd say you exceeded 50mW. This on Ebay: Miniature Audio Transducer Item Description: Panasonic - ECG EAF-14R06C Miniature Audio Transducer Specifications: Rated Input (mw) – 50 DC Resistance (ohms) – 15 Impedance (ohms) – 45 Sound Pressure Level (dB/1 W/1 m) - 93 Frequency (Hz) – 2.5K-3K Physical size (mm) 14x10 |
| XOIIO:
Ah, interesting, first time hearing about magnetic audio transducers. I did have that resistor on the pin providing power to it, but that was based off of the assumption that it's a piezo, and I think the resistor is more for the capacitance of a piezo than current limiting. I'll order a handful of those so I have some spares for other projects. I'm definitely using it at the top end of the range, but I don't need anything aside from a single tone from it. What value resistor should I be using to protect it from over current at ~5v then? Driving it with the tone function from the arduino worked well so probably just over powered it. Don't really have to worry much about that or impedance with piezos, at least I haven't killed any the couple times I used them. Assuming it's nothing wierd, 500 ohms or a bit higher I think? |
| Zero999:
500 Ohm sounds reasonable. I'd put a 1µF capacitor in series with it, which will get rid of the DC component and any associated heating. |
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