If you belong to the category of people for whom the sound quality is of fundamental importance, then you will like this craft. There is a real opportunity to assemble a high-quality sound amplifier from inexpensive spare parts purchased at the nearest radio market or in an electronics store. Of course, you need a certain kind of knowledge, otherwise it will be difficult for you to make an amplifier even according to the clearest instructions.
It is necessary
- - one digital receiver;
- - one operational amplifier;
- - microcircuit stabilizer;
- - DAC;
- - one filter (active type);
- - housing for the amplifier;
- - printed circuit board;
- - soldering iron;
- - rosin;
- - tin.
Instructions
Step 1
So, to make an amplifier for the SAB, you need the following details:
- one digital receiver;
- one operational amplifier;
- microcircuit stabilizer;
- DAC;
- one filter (active type);
- housing for the amplifier;
- printed circuit board;
- soldering iron;
- rosin;
- tin.
Step 2
If you are puzzled by the question of how to assemble an amplifier at home, then this article is for you. Naturally, in order to get started, you must have at least a little basic knowledge of physics and electronics. Without this, it is unlikely that it will be possible to create a working thing. And it will be quite difficult to understand the scheme. And the diagram is the main "detail" of the future product. After all, it is by relying on it that you will craft your sound amplifier.
Step 3
So, before starting work, first decide on the scheme. Finding the one you need is not difficult. On specialized Internet sites, you can find many interesting schemes. Dig through the sites and choose the one that suits you best. At first, it is best to choose the simplest models that will be easy to work with.
Step 4
When you decide on the diagram, install the elements. To do this, you need wires and a soldering iron.
Step 5
It is not difficult to assemble an amplifier correctly if you have an idea of the work to be done. The beginning will be the preparation of the printed circuit board. It is on it with the help of a blowtorch that the parts will be attached. Observing the diagram, install the element, observing the polarity and the rules of correct installation. Microcircuitry is a delicate and capricious business. It does not tolerate haste. Be careful and careful. Gaping, you can burn through the circuit, which will inevitably damage the entire preparatory stage of the work.
Step 6
Next, the board is installed in the case and secured. To test it, it is worth connecting good speakers. Gradually increasing the sound, check all the capabilities of the received device. A low-quality SAB or speakers can distort your sound experience, so check on quality equipment. In addition, it is worth remembering that some passive SABs can have a detrimental effect on amplifiers.
Step 7
Plan everything carefully, find the details, draw up a work plan and everything will work out. The main thing is not to rush and treat the assembly as an adventure.
Step 8
You can also try to create an amplifier that can be successfully used to make a portable speaker for a smartphone or tablet. To create it, prepare the necessary details:
- crown for 9 volts;
- 3.5 mm mini jack;
- microcircuit LM386;
- switch;
- connector for the crown;
- speaker 0.5-1 W and resistance 8 Ohm;
- 10 ohm resistor;
- 10 volt capacitor
Step 9
To assemble the amplifier, prepare the circuit of the future amplifier. Save and print this diagram, or transfer it to paper. So, when the diagram is in front of your eyes, it will be much more convenient for you to work.
Step 10
Consider the diagram carefully. Even with the naked eye it can be seen that the microcircuit used in the work has four legs on each side. A total of eight legs are obtained. In order not to confuse the microcircuit and not turn it upside down, thereby making mistakes in soldering, carefully consider the part. For ease of use, a small mark similar to a semicircle is applied to it. Expand the microcircuit so that this mark is on top.
Step 11
Now start soldering. First you need to solder the first wire, which will go to the switch and the positive contact of the crown. Solder this wiring to the sixth leg of the microcircuit. She is second from the bottom on the right side.
Step 12
Solder the other end of the wire to the switch. After soldering the first wire, proceed to the next step. Now you need the second contact of the switch, which is currently free. Solder the positive wire coming from the connector of the crown to the switch. On this first, this creation of a homemade amplifier can be considered complete.
Step 13
After that, you need to go to the next leg of the microcircuit - the fifth in a row (in the diagram it is indicated by the number 5), it is located under the sixth leg, to which the wire was already soldered at the first stage. Solder the positive terminal of the capacitor to the fifth leg.
Step 14
Solder the remaining negative terminal of the capacitor to the positive terminal of the speaker. This can be done directly. But best of all, to protect the speaker and capacitor from damage, connect them using an additional wire, which you will use to lengthen the capacitor contact. Then solder the negative terminal of the capacitor to the positive terminal of the speaker.
Step 15
After that, connect the negative contact of the speaker to the second and fourth paws of the microcircuit. In the diagram, these are the lower and second from the top paws on the left side of the microcircuit. Solder a wire to the speaker negative terminal. Then connect this wire to the fourth leg of the microcircuit.
Step 16
Use a jumper to connect the fourth and second legs of the microcircuit. To do this, take a short post. Solder it to the fourth leg of the microcircuit (one wire is already attached to it), and connect the other end of this wire to the second leg of the microcircuit.
Step 17
To the third leg of the microcircuit, which is located between the two previous ones with which you have already worked, you need to solder a resistor.
Step 18
Attach the wires to the second leg of the resistor, which will connect the positive contact on the mini-jet. The mini-jet has two contacts - the right and left channels. Connect them together and solder the wire that goes from the resistor to the pins.
Step 19
Solder the minus contact of the mini-jet (the so-called mass) to the minus of the speaker. Now there will be only a minus of the crown connector with a minus of the speaker.
Step 20
After completing these simple manipulations, you have created a simple, but quite effective, amplifier that can be used for a tablet or smartphone speaker.
21
You can increase the sound 2-3 times by making a simple mechanism consisting of a KT315G transistor, a 5.1 kiloohm resistor. Connect the details and use. This amplifier works well with a charger for Nokia, with a voltage of 5, 3 volts.
