» Electronics » Sound and Acoustics »Portable column in the book

Portable column in book

Electronics / Sound and Acoustics
Added 38 comments


Sometimes the volume of the phone or tablet is not enough. The market is full of all sorts of portable speakers. There are waterproof, shockproof, any power and size. When an old book caught my eye, a crazy idea came up. The book must not be used for its intended purpose. I decided to put together a portable speaker that no one else had done.

For homemade we will need:

- speakers;
- ;
- switch;
- battery 18650;
- ;
- BMS;
- the book itself;
- instruments.

Since the body of the column will be a book, there are some requirements for it. The book needs a thick and hardcover. The components will not fit into the thin one, and the soft cover will not be convenient in operation.



Speakers of suitable diameter. I took from the old tape recorder, each one Watt. Great power does not make sense. And I’m not going to turn it on at full power.



The amplifier will be a finished board on the RAM8403 chip. The output power is two of 3 watts, with a power supply of 5.5 volts.



The circuit will be powered by one 18650 lithium-ion battery. If you suddenly do not have enough, you can use another one.



I will charge the battery through the charge controller from China. I have it without a protection board, so I’ll use a mobile phone battery. At the controller on board micro USB, you can charge with any charge with this connector.



Turn off the power of the speaker will be a miniature switch.



You also need a wire with a 3.5 mm jack.

Assembly process.

We mark out places in the book for speakers. Divide the page in half and draw a circle with compasses.



We also make markup for all elements of the circuit. We cut out all the depressions with a clerical knife. Be careful, paper is difficult to cut evenly. It turned out to be crooked, but during assembly everything will be closed with pages.



We solder everything into one design. Wires from the battery through the switch go to the amplifier. Wires from charge controller to battery with protection board. If the battery life is not enough, there is a place to install another battery. The wires to the switch and speakers are soldered last.



We close the book and solder the speakers and the switch.We glue the pages of the book with PVA glue.



Cutting out a window under the charge controller, the page has shifted when closing. I had to glue a piece of paper. Also, for stable fixation of the micro USB connector, I glued a piece of plexiglass. Through it, the charge process is clearly visible.



Such a portable speaker turned out. Sounds great.
The build process can be seen in the video.

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38 comments
+2
Reply To quote A complaint
The attempt to dodge is not counted! ;)
Author 0
Reply To quote A complaint
Excellent, may be different from anything else.
And the quality can be both HI-FI and sound from a demagnetized tape.
0
Reply To quote A complaint
Quote: popvovka
And what is “excellent” similar to “quality”?

Do you think that “excellent” may not be of high quality?
0
Reply To quote A complaint
Quote: Pronin
Late to sell it. And now, nobody needs it.

Who knows, maybe the “warm tube” audiophiles will announce after some time that the film sound is the coolest.)) Vinyl is back.;)
Author +1
Reply To quote A complaint
I came across in the early 90s Albatronics Made in Japan. In it, the corefan and I listened to all the “CINEMA”, “Red Mold”.
Author +1
Reply To quote A complaint
Oh you oracle)) To the point))
0
Reply To quote A complaint
I think the Chinese then had no idea about our state standards
+1
Reply To quote A complaint
Yes, I know this perfectly ... Now !!! As well as the fact that a very, very, very small number of players of that time could really compete with Amphiton in sound quality! ))))
But this I NOW know ...)))
0
Reply To quote A complaint
The question is, in which country and for how many denyuzhk bought!
0
Reply To quote A complaint
In any case, it should sound somewhat better than the acoustics of a mobile ...)))
I think "excellent" and "quality" is when compared with the sound of a mobile phone. Einstein seems to be saying something about the relativity of everything and everything ...))).
0
Reply To quote A complaint
Valery,
Quote: Valery
Yes, there is 100 watts !!! And I have only 10 per channel !!!))))

Our Watts are non-distorting (Power under normalized distortions), theirs are non-destructive (Short-term, a few milliseconds, not leading to physical destruction)
+2
Reply To quote A complaint
In the mid-90s, he was repairing some kind of "Jap" with the inscription stereo. The output small circuit burned out, either with 8 or 10 legs on one side. Having figured out the tracks, I found out that the amplifier is mono, and the speakers are included in parallel. In general, I put UN7 there and did not bother, so the owner said that he began to work louder. And the controls, I remember, were both volume and balance, and even a three-band equalizer. Rather, it was a Chinese fake, because the parts were soldered like freshmen at vocational schools.
Author 0
Reply To quote A complaint
And what is “excellent” similar to “quality”?
+1
Reply To quote A complaint
I even remember the surprise even from the twists with which the cables were twisted !! I was perplexed then - well, it cannot be (in my then concept) so done "from the factory"))) ... smiles
And not immediately then I could understand why it seems to me that many "cool" music centers play no better than my seedy "Mayak" even with a small "Micron-001 stereo" and simple "Estonia-35" !!! Yes they are !!! ... Yes there ...
Yes, there is 100 watts !!! And I have only 10 per channel !!!))))
+1
Reply To quote A complaint
Recently, they brought me a SONY mini player. Type for scrap. A bunch of levers. It can be seen from the latest models. I wanted to make out. but there are latches (dumb screws). Broke it. Inside, everything is very neatly done - in place. Head - a sight for sore eyes, 2 tonals and so on. A masterpiece of engineering.I still have a soundboard ... Eh, cool. Late to sell it. And now, nobody needs it.
+4
Reply To quote A complaint
Ponty is more expensive than money! And farce understood this! When for the first time they brought me C for repairsRAnyo, I’ve gone crazy from simplifying circuitry to primitive and from clumsy installation! Our GOSTs did not allow this! Although it should be noted, the product category “for delivery surrendered” came to us
+4
Reply To quote A complaint
Because we hear the full spectrum of both channels, even without a stereo effect.

Once upon a time, I had an Amphiton player of our local (Brest) production!
Having heard tales about "Japanese equipment has a guarantee of 25 years, and burns down if you open the case", and also, firmly believing that "worse than our Soviet - only our local Brest," I did not consider it any a miracle of sound ", even sound (In good, not full-time stereo headphones) really liked



And now, closer to the end of the 80s, my friend appeared ... "Sanyo" !!!!!
I PERFECTLY UNDERSTANDED that he would have something better sound !!! This is SANYO !!!!! This is not "unfinished Sovdep!" ....
And now, he came to check out this miracle !!! ...
The first thing that caught my eye was one volume and lack of balance adjustment !!!
... KA-A-AK? !!! ... I do not understand !!! ...
A friend replied: Here the balance is AUTOMATICALLY regulated! ")))) ... I tried to be surprised!))) How, they say, is this possible? How can the player know the features of my ears ?!)))
Well, okay .... I’m longing to wear headphones ....
And I can’t understand !!! ... THIS IS NOT STEREO !!!! ... And not only that, only the left channel sounds in both (I put my own tape! And I know where the sound should “run” and how) .
Accustomed to the Soviet one, I knew that some have a “mono-stereo” switch (although I didn’t understand why!) But if you turn it on to “mono”, then the sound is mixed there, and not one channel stupidly remains !!! ... And here it is ...
Having examined the head, I found that it is still with two tracks, and therefore concluded that the player is still just Malfunctioning !!! But this is also not possible - the "Japanese" technique cannot be defective !!! This is not a "scoop" ...
I could not understand, WHAT IS THE DRAFT? !!!
Holy naivety! ))))) ... (Although ... Later, acquiring an imported two-cassette later, I still tried to find in the documents what frequency range he had, what nonlinear distortion and detonation coefficients, and what signal-to-noise ratio. .. And you know ... something there was nothing of the kind indicated ...))))). What surprised me very much !!! In the technique of "SUCH LEVEL" - and the main characteristics are not indicated !!! ...

By the way, most of my acquaintances then mocked me with might and main ... They said that I supposedly wanted to assure everyone that my "shit for 150 rubles with speakers" plays better than this "megasuperapura" bought for 400 !!!
And I could not understand ... THEY THAT .... AND THEY REALLY DO NOT HEAR ?????
dance
+2
Reply To quote A complaint
Sounds great.
The quality and bandwidth here are at the level of consumer goods speakers, and even lower.
+2
Reply To quote A complaint
Quote: Korolev
purely subjective 2 adjacent speakers sound better than one!

Because we hear the full spectrum of both channels, even without a stereo effect. Even for a mono signal, there will be some improvement due to a small smoothing of the perception of sound from speakers with different frequency characteristics.
And the author is right: why disappear to the second channel, there is more margin in volume.
0
Reply To quote A complaint
Khatul Madan
I can’t explain it reasonably, but purely subjectively, 2 adjacent speakers sound better than one! Yes, and everyone has their own circuit designs.
0
Reply To quote A complaint
A classic, it’s a classic, it does not lose its relevance for centuries!
+1
Reply To quote A complaint
I remember I didn’t go to school yet, there was some feast, the table was cramped, and grandfather neatly crushed bread crumbs near his plate in his palm and mouth ... He remembered it for life!
+1
Reply To quote A complaint
“What I’m not doing, everything doesn’t work out very well” Not the gods burned the pots, practice is needed in any business, and experience and skills and dexterity come with it, and there your own ideas and ideas come up, and methods for their implementation! The main thing is that interest does not disappear!
0
Reply To quote A complaint
Valery
Sincerely, with white envy I envy your opportunity not only to read, but also to re-read and analyze what you read! I used to read a lot, but haphazardly, now I barely have time to get technical journals for the upcoming dream, the way of my life seems to be incorrectly organized, with age many simple things began to take much more time!
0
Reply To quote A complaint
I agree with you, but only partially, yes, blasphemy, but the book is a book of discord. Do not turn into a fetish. There are masterpieces worthy of passing on to grandchildren, there are dummies that are not worth the time spent, but there are simply harmful ones, extremism, for example.
Author +1
Reply To quote A complaint
During the rearrangement in the house, I dropped a shelf with books on my leg. For some reason Mayakovsky remembered right away)))
From the poem "Who is *****"
Author +1
Reply To quote A complaint
Well, just finished blocks, so why throw it? Amplifier powered by a switch.
Volume is not particularly important here. The quality and bandwidth here are at the level of consumer goods speakers, and even lower.
Stereo?
So is it worth loading a stereo module with one channel or is a bridge needed?
0
Reply To quote A complaint
On the topic, it is said in the first comment, the volume is small, everything is assembled from ready-made blocks, there is nothing to comment on, except for the design of the case itself. Here's the design and discussion. Well, you can add, why a stereo amplifier for nearby speakers lying in the same plane? And yet, it would be possible to sketch out a little scheme.
+1
Reply To quote A complaint
Mostly listening to audio.

Similarly ... And, basically, behind the wheel .... Otherwise - there is no time ....
Before that, there was a plus to this FB2 from the tablet-seven ... (In any free 5 minutes you can take it out of your pocket and not look for where you left off). Now eyes do not allow ... Glasses constantly cling ... Do not ...
Author +2
Reply To quote A complaint
They wrote in. What to do and from what is everyone’s personal affair. Are there any comments on the topic?
I also respect books in paper, but I don’t have time to read them. Mostly listening to audio.
0
Reply To quote A complaint
Offended by what?
I will not read these books, and there is no time for them.
I read better fiction or a detective story.
And buying books is not a cheap pleasure. I read more electronic.
And I can’t do it, because I'm not a master. What I’m not doing, it’s not very good.
+4
Reply To quote A complaint
And yes ... Maybe here has some place and "old education". (Then it was not so "practically material! Spiritual values ​​were paid more attention than now) ...
But, besides books, I can’t throw out bread as well !!! I always lift the fallen to the ground, and never throw the bread (albeit moldy, or cracker) in the bin !!! (This is simply IMPOSSIBLE !!! Stupor for this is some !!!)
Although my brain understands perfectly well that this is simple symbolism !!! ... But, in the end ... And someone’s grave is just the ground !!! )
+3
Reply To quote A complaint
Ahah. How many ejected books. There were all kinds of Engels with Marx.


And here it is:
Well, I like to watch work, but I can’t do it.


Two consequences of one reason !!
Until you have time to be offended, I hasten to explain:
I do not consider you to be in any way stupid or a fool ... There is simply the concept of “analytical thinking” - this is just one type of thinking (it is not “better or worse”) in which the human brain automatically analyzes ANY information that becomes accessible to him ... His brain works according to the algorithm "If - then - otherwise - if", even if it is not required !!!
It is this property that determines the skill of this person! He does not need to show HOW TO DO. He needs to UNDERSTAND the process, and already “how to do it” is a natural consequence !!
These are the people and "they can do everything"
Your brain doesn’t try to understand the process, sort it out into “logical shelves” ... Your brain is simply EVALUATING the consequence of this process.This is a different type of thinking.
Agree that you know how to do something, you need to LEARN? That is, to show the whole process in detail ... Am I right?
+5
Reply To quote A complaint
The same capital who will read?

For example, I ...
Most likely, you will not understand this ... But I have all the volumes of Lenin, and I periodically read them ... Like the Bible ... Like the Quran ... Like Nietzsche ... Like Dostoevsky ... Like Pushkin ...))))

You see ... If a person’s brain is aimed at ANALYSIS of information, then he is not at all able to ask such a question: “Why read it?”

And how many times I talked with idiots, who, for example, made up their minds about the same Lenin and the “stones”, and they defended him with might and main ... But in fact it turns out ... That they DID NOT READ A TOM VOLUME OF LENIN !!! In general, they did not look there !!!
And the question is: on what basis do they open their mouths?
If you don’t know, you haven’t read it, you haven’t analyzed it .... well, sit still on your trough and scold those who splash a little slop there !!! So no - his voice cuts through !!! ))))

(I’m not saying that everyone who hasn’t read it is “cattle !!!!” I rank among them only those who try to DISCUSS AND INSTRUCT, not knowing the subject, not having fundamental knowledge ... !!! At the same time, doing this quite aggressively and assertively ... Because "not cattle" will simply say: "I won’t argue! I don’t know the topic! I’m not going to build on other people's conversations !!!")))
-1
Reply To quote A complaint
You say the hand will not rise, nobody will read them with a shaft. Blasphemy is when artwork is destroyed. Now it is full of books to read disgusting, nonsense of pure water. The same capital who will read?
0
Reply To quote A complaint
Ahah. How many ejected books. There were all kinds of Engels with Marx. It’s a pity I won’t be able to do this, well, I like to watch work, but I can’t do it.
+7
Reply To quote A complaint
Maybe I have an old-fashioned upbringing, but I wouldn’t raise my hand to disfigure a book, I consider it a barbarism no matter what book. If you really wanted to, you can make an imitation of the case for the book, especially as Korolev correctly said
Quote: Korolev
acoustics love volume
-3
Reply To quote A complaint
Great idea! I would cut everything out, leaving a couple of centimeters on each side along the perimeter: acoustics love volume, and it’s easier to cut and place the filling. But the idea is worth it!

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