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Description: If you want to get some sound out of your project but have a tight space budget, this is a good way to do it. This 0.25W, 8Ohm speaker is only 40mm in diameter and just over 4mm thick, the same kind you might find in one of those "talking greeting cards".


Comments 21 comments

  • I read the Dimensional Drawing, and in the back of my head I heard my high school physics teacher yelling at me, “UNITS! Where’s your Units??

  • when I was soldering longer leads to the built in leads the built in leads broke. so I improvised by soldering my wires to the terminal where the built in leads were. then that whole thing (with the solder points) broke off, leaving the speaker useless. and it made good sound whe hooked up to my PICAXE too. :(

  • the price is right :)

  • How does this speaker perform at full-range, vocals I assume sound good as this is a greeting card speaker.. Will instruments be heard?

  • Help me out I’m a noob… Are speakers polarized? How would one control the volume of this?

    • Speakers do have ‘polarity’, in a way, although whether or not you’ll care depends on various circumstances. For headphones, for example, it’s fairly important that you do get the polarity the same (whether correct or incorrect, as long as they’re both correct, or both incorrect) as otherwise your brain starts playing tricks on you. For room speakers it becomes less of an issue, although in some circumstances you can get cancellation effects going that, again, make things sound odd. So it can’t hurt to at least wire the speakers up the same way.

      You do run into some problems if you have dissimilar speakers and aren’t sure which pin is which. One trick you can use on larger speakers is to just apply a small DC voltage (an AA battery, for example), and when the speaker cone is pushed outward, note which battery terminal (positive vs negative) you applied to which pin.

      I don’t think you’d be able to easily use that method on this thin speaker (the deflection would be quite minor and difficult to spot). However, you don’t have to. On this speaker, the + is actually marked on the speaker itself. It’s not easy to see and looks more like just a thick line at one of the solder pads, but it’s there :)

  • So this is something that you could connect straight to a PWM output on an Arduino or equivalent to play sounds?

    I just got a Freetronics EtherTen and a Gameduino a few days ago, so I’m new.

  • cool

  • Can we get a profile shot? We are talking about how thin this is after all. :)

    • The last photo has it in profile next to our NIST-calibrated quarter.

      • How much does a NIST-calibrated quarter go for? $0.25? :)

        • Yes, but the locked, climate-controlled, dust-free case we keep it in between shoots was really expensive.

          • Could you please put that quarter next to a nickel so we can see how thick your quarter is?

            • Could you please put a dime next to the nickel so we can see how thick your nickel is so we can see how thick your quarter is?

              • Could you please put a ruler next to the dime so we can see how tick everyting is?

                • Could you please put a speaker next to the ruler so we can see how big the ruler is?

                  • WAHAHAHAHAHA!!!

                    • Could you please put a ruler next to the ruler so we know how big the rulers are?

                      • Could you please place a chain of helium atoms next to the ruler next to the ruler on top of the speaker next to the dime next to the nickel next to the quarter so we can see how thick they are?

                        • Could you please search your couch cushions for another two quarters and a nickel so you can just buy the damn speaker and hush already?

                      • Could you please place the center of the ruler on top of the speaker then place the quarter on one end of the ruler then immediately slam down on the other end of the ruler. The greatest height of the quarter will give a great indication of how thick the speaker is.

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