Column in the book with their own hands
I sat one evening with a book in my hands and a crazy idea came. Column speakers already pall. So I decided to collect an unusual column, not like everyone else. It can be taken on nature or used in the garage at the cottage.
In the barn found an old book. I will not read it for sure, but it will still go to work.
Homemade need a thick book in a hard cover, in a soft book it will be extremely inconvenient to work with it.
Speakers need a small diameter. I took the old ones from some kind of tape recorder. I have 1 watt at 4 ohms. In this size, especially powerful does not happen. This power will be enough for me, I will not cheat at full volume.
I will use a 18650 format Li-ion battery as power. I have a battery element with a residual capacity of 2440 mAh. If the book is thick, then you can install two batteries. I will do this if I do not have enough capacity of this element. It is better to use Li-pol, it is just the right thickness for this homemade. I did not have it, applied Li-ion.
I will charge the battery with a controller from China.These modules are cheap. There are also controller boards with protection, but what I have, I applied one. It is necessary to take into account that the board with protection is longer.
Since I have a charge controller without protection (BMS), I will use a protection handkerchief from a mobile phone battery. Fortunately, they are available everywhere.
As the amplifier I will apply the ready module from China. The module is assembled on a chip RAM8403. The board provides 2 * 3 watts. I will adjust the volume directly from the playback device. The need for a volume control is eliminated.
Apply such a switch. He took it off the PC power supply.
Making a column from a book
We turn to the manufacture of the column. First you need to mark where the speakers will be installed. Then you can go to markup cuts for all elements. Mark the holes for the speakers elementary. Divide the page in half and compass draw circles, cut with a knife on the paper.
After cutting the round holes for the speakers, I proceeded to cut niches for the rest of the column elements. Need to cut carefully. It is necessary to clamp the pages together and cut. The main thing is not to forget to fold some of the pages, they will serve as the front panel. Under the switch you need to make a through hole. Just need to go through for the charge controller.
We unsolder everything together. The scheme is very simple. Battery power is supplied to the amplifier board. Minus directly, plus through the switch. The wires from the charge controller go to the 18650 battery. I soldered a protection board to the battery. Output wires from the amplifier go to the speakers. 3.5 mm jack soldered to the input of the amplifier. I brought him under the cover of the seam of the book.
When closing pages, it looks like this. We check the work and then proceed to further action.
Now you need to glue the pages together. Glues ordinary PVA glue. After spreading the pages, put the book under the press. Clay dries out pretty quickly. If you do not put the press, then the page jars and becomes not beautiful.
The window with the charge controller had to be finalized. Cut a very large hole. Pasted a piece of the page. The same connector stuck to the segment of plexiglass. When you connect the charger, the charge process is clearly visible.