Simple sound amplifier

We make a simple sound amplifier with our own hands. We will need the following:
1) Coil: L1 5 µH
2) Resistors: R1, R3 2.2 kOhm; R2,R5 22kOhm; R4 680 Ohm; R6 2.2 Ohm; R7 10 Ohm.
3) Capacitors: C1, C4- 4.7 uF-25V; S3-22 uF-25V; S3-22 uF-25V; C5-0.47 uF-25V; C6, C7-1000 uF-35V.
4) Chip: DA1 TDA2050
Also for soldering you need to purchase: a ceramic soldering iron, solder, fiberglass, ferric chloride, flux (rosin), a speaker (to check the functionality of the amplifier), 10 V power supply (“crown”), wires, connector, radiator (at first the microcircuit will not heat up strongly, but it is still recommended to install cooling), glossy photo paper.
Now comes the fun part, preparing for work. Here is a diagram of our device:



Now we need to make the layout, which is easiest to do in the sprint layout program. After the layout is ready, we print our layout on photo paper (the printer must be laser!). Then we place the printed fragment on our board and iron it for 5-10 minutes. Then we lower it under water and peel off the paper with light movements. Now we need to etch the board.To do this, take ferric chloride and add it to slightly warmed water and dip the board into it (under no circumstances use dishes intended for eating!) The etching process takes from 10 minutes to 5-8 hours, it all depends on the amount of solution and temperature water. After the board has been etched, we peel off the paint layer, as a result of which our traces will become copper. Now we just have to solder the elements. First, let's drill holes for our elements, after which it is recommended to lubricate the tracks with flux. After this, we insert all the elements according to the diagram and solder them. At this point, our work enters the final stage, testing for functionality.





By connecting the power, speaker and connecting the jack to a device with a 3.5 mm jack, you will hear your favorite music. For convenience, you can come up with a housing for your device; you can see an example of a housing below.