Do-it-yourself portable speaker for your phone (drawings). DIY portable speaker in just a couple of days
Difficulty level: Not easy
What you will need:
- microcircuit TDA2003 or its analogues, K174UN14 - domestic analogue (price approximately 0.3 $)
- capacitors: a) 10 mf 16v - 1 pc. b) 100 mf 16 v - 2 pcs. c)0.1 mf 16v - 1 pc. d) 470 mf 16 v - 1 pc. (you can use capacitors larger than 16v, but as a rule they consume more energy)
- resistors: a)10 om - 1 piece b)1 om - 1 piece c)1kom - 1 piece
- speaker (more on that later)
- soldering iron, solder.
1 step
Chip TDA2003
We make a list of the components we need and go to the nearest radio store, where we will buy all the parts and assemble our MONO amplifier. I suggest choosing a mono amplifier for several reasons:
1) less energy consumption compared to a stereo amplifier.
2) from a portable speaker, in my opinion, such things as sound quality, volume, battery life are required.
Step 2
MONO amplifier circuit on TDA2003
After we have purchased all the components we need, we can proceed directly to assembling the amplifier. (diagram on the left) I have tested this diagram more than once, it has good quality sound, and it is quite simple to manufacture and does not require configuration.
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It is recommended to assemble the amplifier on a printed circuit board, but if you don’t have the skills to make one, you can assemble it on cardboard (just pierce holes, insert parts into them and connect according to the diagram)
Step 3
An example of assembling an amplifier on cardboard
After we have safely completed the assembly, we need to take care of cooling the TDA2003. For this
I recommend using a small heatsink that is bolted to the hole on the chip; you can also use thermal paste for better heat transfer.
Step 4
Now we need to take care of the power supply to our amplifier, here are its power ranges - from 8 to 16 V. (recommended 14.4 c.). I used 3 batteries from mobile phones, which in total produced 11.1 V. which is quite enough to power our amplifier.
You can also use AAA or AA batteries, we need 8 pcs. , which will give a total of 12V.
Step 5
speaker selection. This amplifier is suitable for 2, 4, 8 ohm speakers.
2 ohm 10 watts
4 ohm 5 watt
8 ohm 2.5 W
but from my own experience I will say that I connected a 30 W PIONEER car speaker (4 ohm), and it played very loudly and with high quality
Step 6
Example of a wooden case
as the basis for the case for our portable speaker, we can take the case from a broken computer speaker, but for high-quality sound we need to do it ourselves wooden case. It is made from 5-7-layer plywood, in such a case the speaker will have more low frequencies, and clear sound on high.
- When soldering, do not solder the part for more than 3-4 seconds.
- organize yours well workplace, there should not be anything superfluous on it
About a week ago the need arose for a small portable stereo speaker. Moreover, it had to work both in normal and harsh weather conditions. Therefore, it was decided to whip up a portable mini speaker from scrap trash.
Why didn’t the author of the video (Aka Kasyan) buy such a mini speaker, but made it with his own hands? There was no point: everything needed for assembly was available, and why pay if your hands grow from the right place. And since the project had to be implemented as quickly as possible, I decided to use ready-made Chinese modules. The overall costs are meager. You can buy an amplifier module, charging board and 18650 battery in this store.
The food will be lithium ion battery. Due to the limitations of the case, in the example shown, it is not possible to use the popular 18650 standard. But fortunately, I found a battery from an old camera with a capacity of 1600 milliamp hours, which fit perfectly. In principle, there are no restrictions on the choice of battery; any lithium-ion battery will do.
We will need a lithium battery charging board from USB with protection based on tp 4056 chips with a charge current of 1 ampere. As a power amplifier, there is also a ready-made module in the form of a compact board, on which the pam 8403 chip proudly stands, which is a two-channel low-frequency power amplifier of class d, capable of delivering up to 3 watts of power to each channel in the case of a 4 Ohm output load.
At the very beginning I wanted to build an amplifier using my favorite TDA 2822, but the compact size, cheapness and efficiency of the pam 8403 chip made me change my mind. The body will be a large Kinder Surprise container. Unfortunately, we have not yet been able to get a 3D printer from the Chinese, so when it comes to the body, we have to improvise.
The loudspeakers will be speakers from broken computer speakers. But using other paper speakers, the mini speaker will play louder. In addition to all of the above, we need a switch that must be latched. Three and a half millimeter stereo jack and cable to it.
As you understand, our signal transmission will be carried out by wire. Now we collect the filling and test it. It’s impossible to make a mistake if you do everything according to the picture.
At the end we install assembled circuit into the body. For convenience, the modules were fixed on a small stand. Almost all parts are secured with hot glue, including the loudspeaker.
So, the column was quickly assembled. The whole job took no more than half an hour.
DIY mini speaker for minimal investment.
Hi all! Today I will tell you how you can assemble a mini Bluetooth speaker for little money.
The legend is this: I moved into an apartment (study is all over the place), and there was a need for a mini speaker for listening to music. And I began to weigh two options for the outcome of events.
As you understand, the choice fell on the first option. And the beginning of the story is something very long. Go!
First of all, we go to our favorite Chinese site to look for what we need. And we need:
4 Li-ion batteries (I already had them) Charging module from Power Bank Sound amplifier (I chose PAM8403) Bluetooth module
Speakers, plywood and material for external cladding can also be found in your utility room.
The sound amplifier arrived first. The amplifier is very miniature and can produce 3 watts of power on two channels. Maximum voltage power supply 5v.
The bluetooth module arrived next. It is recognized as XY-BT, there are no irritable voices when connected, only short signals. The sound quality is good.
The latest to arrive was the charging board with the power bank. This board can be called the heart of our future speaker, since it plays the role of charging, indicator and boost converter. If desired, you can take it to back panel Not busy port and charge your gadget from it.
The assembly process begins.
The evening spent in the garage yielded results. On the outside I covered the plywood with a layer of leatherette. Later I glued the corners together with regular superglue. The internal connections were filled with sealant. I used the legs from an old (no longer working) laptop.
At the assembly stage, it turned out that the speakers I used turned out to be high-impedance. High resistance has a negative effect on output power, but has a positive effect on the durability of the entire design (since an amplifier board designed for 8 ohms will work for all 12)
I put everything together like this. I made adapters from USB and Micro USB. Batteries of unknown manufacture and unknown capacity. By the way, I charged them with the same board, only I measured the charge with a voltmeter (since there is no balancer in our assembly).
On the back side there is such a control panel. The volume control is paired with a key, so there was no need to fence the switch. Behind the mesh there is a tinted window behind which the charge indicator lights up, next to it there is an LED indicating the on state, below is the volume control/key and even below is a hole with a charging connector.
Perfecto! In my opinion it turned out not bad. The sound is good, with some low-frequency notes. The volume is quite enough to sound the entire apartment. The charge when I use it lasts for a week to a week and a half.
DIY mini speaker for minimal investment. Part 2
Hi all! It was decided to devote the second part of the article entirely to the electronics of our mini speaker.
Background. Last time I did not mention the experiments conducted before the arrival of the board from the Power Bank. Since she drove for a very long time...
This is what the first fully assembled and operational version looked like. Charging and display were carried out using the TP4056 board, already quite well known among DIYers. As you can see, our board charged only one Li-ion battery. After the first test, it became clear that its capacity would be sorely lacking.
After a few days of experimentation, everything was dismantled from the body and redone. All 4 batteries were balanced and paralleled with a copper busbar. Connections to the boards were made using factory connectors, that is, no changes were made to the design.
Installation inside the column was carried out using sealant. The connections have also been strengthened to eliminate the possibility of disconnection due to vibrations.
ULF. If desired, it is possible to use more powerful amplifier low frequency. If you use PAM8403, for example PAM8610, in place, you can get higher output power, however, losing some of its autonomy.
Approximate electronic circuit our column. It turned out that sellers do not want to distribute schematics for their devices, and finding a datasheet is another problem.
This review is dedicated to the miniature 40mm speakers that I used in a homemade speaker. I’ll say right away that the speakers met my expectations as tweeters and, together with the low-frequency sound, they gave quite acceptable sound for a fairly compact speaker.
It all started with a miniature subwoofer that came with ASUS laptop N55S
I used it quite rarely, but despite this, the 2.5" connector on the laptop to which this speaker was connected began to make poor connections and finally simply fell inside the laptop. I didn’t see any particular need for repairs, since the laptop was used mainly for work and didn’t really need good bass.
But the idea of using this speaker as a portable miniature speaker has been in my head for a long time. Unfortunately, it was problematic to fit anything other than this speaker into that housing, so I decided to change the speaker housing.
At first I wanted to build a speaker using a pair of half-watt speakers from old computers. 
Their diameter was too large, and the sound was simply disgusting. Repulsively creaking, and a little more volume - even more rattling. The woofer did not improve the sound quality. Something different was needed. And then on the Internet I found the speakers from the review.
I bought them on EBAY, although it was possible on ALI and TAO:
Stated characteristics
- Diameter - 40mm
- Height - 20mm
- Magnet diameter - 22mm
- Rated power - 3W
- Resistance - 4 Ohm
- Frequency range - 170KHz
- Harmonic distortion factor - 1%
Components used
- Speakers 3 W 4 Ohm 40 mm from the link above $1.9 x 2 = $3.8
- If I were to buy the case (left over from another project), I would take it without a transparent cover, size 115x90x55
- - $0.99 for 2 pieces
- ~ $0.5
- Woofer 5 W 4 Ohm
- Battery from a faulty phone at 2200 mAh
The size is smaller than that of speakers from computer cases.
Therefore, a 120x80x55 mm instrument case with a transparent cover, which was lying around idle, came up, which is absolutely unnecessary in this product.
Dimensions correspond to declared
Weight 25g (maybe someone from TAO will order) 
Resistance is also quite normal 
All speakers included 
Miniature amplifier boards based on PAM8403 
Charging boards lithium batteries with a current of 600mA on TP4056 (current can be adjusted up to 1A) 
Initial testing of the speakers led to a slight rattling at maximum volume, so I installed a volume divider and a high-pass filter on a 0.1 mKF capacitor at the input
The final diagram looked like this 
Cut holes in the case for the speakers, button and MiniUSB connector 
Glue in the speakers, install the board, solder the battery 
Connect to the phone. 
You can close the case 
Well, what can I say about the sound? The quality was pleasantly surprising. For such a small rattler, the sound is very loud and high quality. The sound can be slightly adjusted using the equalizer on your phone/tablet/computer. There is bass, normal highs.
Consumption is 150mA at maximum volume, that is approximately 0.5 W. With a battery capacity of 2200 mAh, it will last for 12-20 hours, depending on the volume. It is also possible from the network through any power supply with a USB connector or a computer.
The speaker suited us quite well. 
The Chinese would boldly write HiFi on it))) 
Just a little work left to do appearance. I cover the speakers with window nets. 
And I cover it with carbon-look film that I have lying around somewhere in the closet. And here is the finished product, the fruit of several evenings.
In the future, we will improve this speaker with a volume control, a battery charge indicator and replace the line input with a bluetooth module (or FM/MP3/USB)
Read about all my crafts in
Probably not a single person can do without music. And when music is always with you, it really lifts your spirits. In this article I will tell you how to make your own music speaker.
To create our column you will need:
The amplifier, I purchased it at a radio store for 100 rubles. It is assembled on a high-quality PAM8403 chip
Speaker(3w, 4 Ohm)
A few wires
Phone battery
Switch.
The soldering iron is small.
Housing, purchased at a radio store for 60 rubles
3.5mm plug from broken headphones
Protective mesh for the speaker, taken from a broken speaker
Hot melt adhesive
Charging socket.
Stationery knife.
When all the components are available, you can begin.
First of all, carefully cut out a hole for the switch using a utility knife.
We put the switch in this place. It will be held in place by its own clamps. It looked like it came out of a box.
This switch differs from the usual size, it is about 1.5 times smaller than usual, it looks stylish and solid.
Next step. We make a hole in the front part of the case, using the same knife, our speaker will be located there, it will stand at the top and be placed outside.
Let's check if the speaker fits there well. If everything is fine, then you can fill it with hot glue.
Now let's start studying the amplifier.
In the photo I conveyed it as quickly as possible brief information about assembling the amplifier.
First of all, we will solder the sound input, this is a 3.5 mm jack, for example from old or broken headphones. The basic one is a white wire, green and blue, right and left audio input to the amplifier.
Then we solder the amplifier output to the speaker, since I only have one speaker, I will not implement the amplifier a second time.
Immediately solder the power supply to the amplifier to the plus of the battery through the switch. We'll make a USB socket for charging.
After placing the nest on the side panel, you can begin assembling the box. There are no difficulties, all you have to do is close the rear roof and install protection from physical impact at the front.
