Autumn came again. And along with her came the gray sky, rainy weather and autumn melancholy. In such weather, you want to kindle a fireplace, climb up with your feet on an armchair, wrap yourself in a warm blanket and, slowly sipping a hot tea, listen to some kind of radio play, as in childhood. It seemed, with the modern development of technology with listening to plays or audiobooks, there are no problems - we are surrounded by many devices capable of reproducing sound. These are computers, phones, mp3 players. But the problem is that this sound differs from the one that the old radios, receivers or players made. So you have to make a player that will sound like "as a child." And look appropriate.
 
 

 
 
To whom it is interesting, welcome under kat.
 
 
In order to get sound from the past, we need a speaker from the past. In my case, it was 4GD-35. The speaker has a high Q-factor and is therefore designed for installation in open cases. This should be taken into account when designing the device.
 
 
As a player, I will use a motherboard based on the GPD2856C chip. This board has a low cost (~ $ 1 for 2 pieces) built-in 2W amplifier and enough functionality for playing MP3 files from microSD cards. As a power source was found a power supply from an old cell phone. Also there were several clock buttons, a power button and a few wires. All this combined into a simple scheme.
 
 

 
 
Assembled, tested (with Chinese components without this in any way), I thought about the case. In the presence of a 3D printer, reflections were more philosophical in nature - in what style it was to be executed and how to make a 20.5 cm front panel for a 20.5 cm diameter speaker without splicing this panel from separate parts. The corps decided to do it in the style of old radio channels. Speakers of the speaker covered the corners. He modeled in CAD "Compass 3D". First he created dimensional models of the main elements.
 
 

 
 
Then he created the parts of the hull directly and assembled them.
 
 

 
 
Here I am a bit skeptical, since I did not make a model of the dynamics, but about this below. Received models sent to print. Printed on the printer Picaso Designer. Used 2 plastic: red PET-G, manufactured by ABS-Maker and brown ABS, manufactured by Picaso. In all cases, a nozzle 0.3 mm in diameter was used, printing was 0.2 mm.
 
 

 
 
As parts were printed, he began to collect and try them on to each other.
 
 

 
 
And it turned out that the wings of the speaker crashed into the side supports.
 
 

 
 
Supports were remodeled and reprinted.
 
 

 
 
Buttons made "talking", its form indicating the action that will occur when you click. This allowed not to make unnecessary inscriptions on the case.
 
 

 
 
The electronics were fixed with hotmelt.
 
 

 
 
The grill was made from the acoustical fabric left after the waist of the grills of the large columns. At the back, the fabric was crushed by a grille, in the form of a grille of the front panel, and, like electronics, fixed with hot-melt adhesive.
 
 

 
 
The final touch is the installation of the back wall.
 
 

 
 
Then I made a test inclusion.
 
 

 
 
By sound, the player fully justified the expectations assigned to him. Excellent speech is emphasized, while background music sounds (if any) go to the background. Exactly what I expected from this project. In appearance, it fits perfectly into the interior of the apartment, as indeed was intended.
 
 
I will be happy with your questions and comments.
 
 
Sincerely, Maxim.