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    uxcell DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer
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    uxcell

    uxcell DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer

    5.0
    €46,00
    €46,00
    €76,00
    Sold out
    Save 39% (€30,00)
    You can't add more than 500 quantity.
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    Description

    • Product Name : Electronic Alarm Buzzer;Sound-making Type : Continuous Sound;Rated Voltage : DC 3-24V
    • Sound Pressure : 110dB;Overall Size : 43 x 40mm / 1.7" x 1.6" (D*T)
    • Thread Diameter : 3mm / 0.12";Mounting Hole Distance : 33mm / 1.3"
    • External Material : Plastic;Color : Black
    • Weight : 35g;Package Content : 1 x Electronic Alarm Buzzer
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    Customer Reviews

    Loud, continuous tone.Five stars for the product I received. But the description and "headline" do not match, leading to customer confusion.At the top of the page, the unit is called: "DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer". But down in the description, they say this: "Product Name : Electronic Alarm Buzzer;Sound-making Type : Discontinuous Sound;Rated Voltage : DC 3-24V".I received one today, and testing it, it produces a CONTINUOUS tone. It doesn't "beep" on its own. If you want it to beep intermittently (produce a DIScontinuous sound), you will need to use a circuit or program the controller driving it to cycle power on and off to it.At least that's how the one I just received works.It's annoying when the descriptions for products are ambiguous like this. You have no way of knowing what it is you'll be receiving. As inexpensive as it was, I just rolled the dice and ordered one.Having said that, the unit I received is excellent.Tested at 24VDC, it produces a loud, continuous, more or less sine-wave tone at 2.869 KHz with some harmonics further down. The loudness measured at one meter, was 105dBspl measured with no weighting (flat). This was measured with the unit NOT mounted in any kind of panel, so that will affect things in your actual use. Also, the room in which I was measuring it was NOT anechoic, and has no sound absorptive treatment at all. It's probably a bit more reflective than many rooms, but might be typical of a control room situation (concrete block walls, but with shelves loaded with stuff on some surfaces).Further, the room was not silent. Our water plant was operating at the time, behind one closed door, but still, the average full-spectrum noise level in the room where I was measuring was around 69dB (unweighted - flat). So the sound level of the buzzer was being measured on top of the ambient noise level. This is far from ideal, of course!I made the measurements using an app on my android tablet called "AudioTool" and a calibrated measurement microphone that plugs into the jack on the tablet. I used a feature where you see a continuously updated graph of sound level versus frequency. So the loudnesses I'm quoting are for the single frequency peak at the fundamental of the tone. There are harmonics down lower, which would also contribute to the overall loudness, and, remember that there was the background noise in the room mixed in as well.So take all of my loudness level measurements for what they're worth. Ideally, you'd use a setup like this, but in an otherwise silent anechoic chamber. Sorry. I don't happen to have one of those. :)I will say that leaving the unit on, in that room, while I made the initial measurement was quite uncomfortable. It's annoyingly loud! So I put on some hearing protectors when I decided to make additional, more detailed measurements.I'd compare this unit to the similar Mallory Sonalert type devices.Since these are usually far louder than what is needed, the end users often simply place some electrical or duct tape over the faces of these units, covering enough of the opening to adjust the sound level to where we/they want it.But if you are set up for it, you can also adjust the sound level to more or less anything you want by adjusting the voltage to the unit. The current draw is fairly low, so you don't need a high power regulator to set this up. There are numerous circuits one could use for this ranging from an adjustable voltage regulator to a series zener diode, or just a simple series rheostat.For what it's worth, and remembering the limitations of the sound level measurements I could make, here is what I measured when driving the unit at several voltages:The unit initially started oscillating at about 1.134 Volts. You could turn the voltage back down a bit once it started up, and it would run at a slightly lower voltage. But to reliably start, I had to hit it with that 1.134 Volts. This figure will probably vary quite a bit from unit to unit, and over temperature, etc. Thus, the manufacturer is wise in saying that the voltage range starts at 3 Volts. You'd want to be sure all of them would start reliably, over a range of temperatures, etc., at the lowest voltage you specify. So 3V is probably a good, safe value.Voltage - Current Draw - Sound Level (unweighted at appx. 1 meter under MY conditions) 1.134V - 0.21mA - Not Measured (Threshold of operation) 1.5V - 0.44mA - 72dB 3.0V - 1.37mA - 80dB 5.0V - 2.52mA - 85dB10.0V - 5.67mA - 89dB12.0V - 7.94mA - 93dB15.0V - 11.43mA - 95dB20.0V - 19.72mA - 98dB24.0V - 26.63mA - 105dBI cannot make any statement about the long term reliability of this device since I just received it. But it seems to be of reasonable quality and operates well, producing a very loud tone. 5Five StarsAs discribed 5Nice and loud!Produces a very audible piercing alarm at 12V. 5
    uxcell DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer

    uxcell DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer

    5.0
    You can't add more than 500 quantity.
    €46,00
    €46,00
    €76,00
    Sold out
    Save 39% (€30,00)