Introducing the all new green cardboard mp3 speaker... - diyAudio
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Old 25th November 2009, 12:26 AM   #1
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Smile Introducing the all new green cardboard mp3 speaker...

Well, I had to put this somewhere - it isn't multiway or full range, strictly speaking, as the drivers are in the same enclosure...but it is closer to full range. Due to lack of tools, I had to use some nice cardboard from an old printer box. Luckily it had a nice finish... This time, everything works, unlike the previous model, which was twice as small, had crappier drivers and some of the controls stuffed up.

Sound from this speaker can get pretty loud (for 6V and 40mA) and images well. The finer parts of songs are produced well, and bass is good considering the size of the drivers (40mm). The down side is that the drivers are a little bright around 7kHz and have a small honk at about 600Hz (cardboard enclosure), however, this isn't too much of an issue. Also, the TDA2822M chip doesn't like deep bass, so if the song has lots of bass, loudness won't be as much.

The bass and treble controls don't work across the whole range of the potentiometers due to lack of 500 Ohm pots in Aus. So the effect is in the last 10% .

All I need now is to wait until I can get a router and some MDF to make the proper enclosure. I will also condense the panel by removing the balance and LED light controls, as they don’t really get used. Only one LED will be used.

Please excuse the webcam quality of the pics…
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Old 25th November 2009, 12:30 AM   #2
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Join Date: Oct 2009
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And some more pictures...

Note the quality of the underside of the PCB...
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Old 25th November 2009, 12:50 AM   #3
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Sweet!
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Old 25th November 2009, 06:31 AM   #4
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Great to see more people using cardboard. I suspect there'll be more over Christmas.
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Old 7th April 2012, 02:21 AM   #5
fakeout is offline fakeout  Canada
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I love the awesomeness of this project. I'd like to get to a point where I could do that.
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