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Re: Speakers

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.arch.embedded
Subject Re: Speakers
Date 2020-11-07 21:57 -0800
Organization A noiseless patient Spider
Message-ID <878sbc9yrg.fsf@nightsong.com> (permalink)
References (7 earlier) <fl8cqfl031dnbbade32rtq06rp42r4fr6c@4ax.com> <4e40e331-c9be-4a6a-a0d4-26af74eca9a7o@googlegroups.com> <AO-dnfEl_IekADvCnZ2dnUU78fPNnZ2d@giganews.com> <af798140-2639-4884-adb8-c98ce7c13ff5o@googlegroups.com> <e94de9b4-5438-4583-a457-347179f7d667o@googlegroups.com>

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> Availability is going to be a problem though.

Wonder if this will work for you:

https://www.adafruit.com/product/3351

It's 2.8" x 1.2" so less panel area than a 2" circle or square, but it
does exceed 2" in one dimension.  It comes with an enclosure.  You'd
have to test to see if it meets your loudness requirement but you'd also
have to test that Kingstate speaker.

Unless you have a powerful audio amp you're not likely to blow out the
speaker despite the low impedance.  The drive signal itself (if it's
coming from a digital pin) will likely have higher impedance.  You can
also increase the input impedance by adding a small transformer or LC
filter, but I don't know if that kind of thing is done any more.

You could add an amplification chip like the one on this board:

https://www.adafruit.com/product/3006

I might get one of those enclosed speakers (they are cheap) next time I
order from Adafruit since I occasionally also want something like that.

Really though, why not try scrounging a small speaker from a pocket
radio or something, to see if it loud enough?  That might be enough to
stop searching, if a generic speaker suffices.

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Thread

Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-05 14:25 -0800
  Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-05 14:56 -0800
    Re: Speakers John Speth <johnspeth@yahoo.com> - 2020-11-05 18:47 -0800
      Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-05 21:15 -0800
        Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-05 21:57 -0800
          Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 08:08 -0800
            Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-06 14:59 -0800
              Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 17:48 -0800
                Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-07 01:02 -0800
              Re: Speakers upsidedown@downunder.com - 2020-11-07 06:47 +0200
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 21:23 -0800
                Re: Speakers Michael Kellett <mk@mkesc.co.uk> - 2020-11-07 13:12 +0000
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-07 08:05 -0800
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-07 18:35 -0800
                Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-07 21:57 -0800
  Re: Speakers "Mat Nieuwenhoven" <mnieuw@zap.a2000.nl> - 2020-11-08 10:03 +0100

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