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Description: A small audio speaker that is ideal for radio and amplifier projects and is small enough to fit in robot projects.


  • Small Size
  • Power rating: 0.5W
  • Impedance: 8 ohm

Dimensions: 50mm diameter, 16mm high, 28mm base diameter

Comments 17 comments

  • Kinda surprised that Spark Fun has so few speaker choices in their catalog.

  • Anyone who has any feedback on the audio quality of this?

  • This speaker is 8Ω, .5W. What exactly does that mean? If I was to power this with a 3.3V supply, would I need extra resistance to meet those values?
    3.3V and .5W = ~22Ω, so would adding a 15Ω resistor be the way to go?

    • The speakers provide 8 ohms of resistance (by far the most common value, though there are 4 ohm and 2 ohm speakers out there), and can handle amplified audio signals up to 0.5W of power (i.e. very little – many consumer home stereos provide hundreds of watts of power).

      Typically you would not hook this up to, say, the PCM output of an Arduino directly. You would amplify the signal somehow. One common way would be to use a simple, cheap power amp chip like the LM386. If you Google “simple LM386 amplifier” you will find tons of examples that only use the chip and a handful of resistors and capacitors, so this is a very straightforward project. And if you include a potentiometer in the right spot, you will get a volume knob.

      A headphone amp should be enough to drive a small speaker like this, so if you want to hook this up to some sort of audio out board or device, anything that supports hooking up headphones directly ought to work as well.

  • Hi. Is there any datasheet for this speaker?

  • Could I just drive this with a mosfet instead of a speaker amp? I’ve had success PWMing headphone speakers from my arduino to make tones, but I don’t know how well it’d scale up.

  • How do you mount these speakers to anything, since they don’t have holes?

  • Hi guys,

    For the ones who have tested them, how are the bass in them? I’m planning to buy these for some homemade headphones and wundered if they would be able to create some good debt?

    Thanks and looking forward to hear from you Mads

    • wundered if they would be able to create some good debt?

      If you buy two, that means they would create a debt of $3.90… ;-)

  • Excellent speaker! I’ve been using these for my Arduino based Alarm clock (Xronos Clock) and they sound excellent, no distortion and pretty loud. Trick to get more volume is to put them in enclosure with 3mm holes in front of membrane. It wasn’t intentional, but I got amazing amplification from this.

  • What are it’s dimensions?

  • Amps = watts/volts.

  • If I wanted to take one (or two) of these speakers and use them as output from a 1/8" stereo jack, would that be possible?

  • Any plans on getting these back in stock soon, or have they been replaced/discontinued?

  • Why doesn’t this item pop up when I search up “speaker” or “audio”?

    • When I search for “speaker” this is the first thing that comes up. But, like you said, “audio” doesn’t make it appear.

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