The author of Instructables under the nickname ImpactDIY made a portable speaker in the style of the seventies. Inside, of course, everything is modern: a Class D amplifier, Bluetooth ...
The master begins with the manufacture of cardboard parts of the case:
2 pcs. 170x170 mm - side walls
2 pcs. 170x260 mm - upper and lower walls
4 things. 170x245 mm - front and back walls (both two-layer)
6 pcs 20x220 mm - carrying handle
The master marks out two large openings for dynamic heads and one small for a bass reflex tube.
Cuts out:
Adhesive dynamic heads:
Assembles the case:
Then the handle:
As a class D amplifier, ImpactDIY takes the PAM 8610 module, where there is even a variable resistor for adjusting the volume:
He needs 12 V, so the master uses three 18650 batteries and an HX-3S-FL25A 3 SBMS charge-discharge controller with balancing function:
Do not do this, either spot welding or compartments! Batteries must be protected!
The wizard adds a power socket (PSU is suitable from the router) and a switch:
Bluetooth module and 5-volt buck converter for it:
Glues the power socket on the back wall:
Sets everything in its place electronics and bass reflex tube:
It paints the front panel (it, as we recall, is two-layer, one layer has already become part of the body, the second is removable) in black and is pasted over with a cloth:
Installs a handle and a front panel with a cloth:
Adheres a sound absorber to the rear wall:
The column is ready to go.