DIY Bluetooth Speaker (Simple Design But Powerful)

hello!! In this Instructable I'd like to share my bluetooth speaker design. Years ago ,there were tape recorders and I had one at my home made by Philips, after few years it malfunctioned and tape technology got obsolete and I am all left is with the 2 independent Speakers which I saved them, I got inspired by the bluetooth technology and had this design idea of making a bluetooth speaker but postponed it :( and finally decided of making my idea into reality.

There are many other fantastic BT speaker Instructables made by other hobbyists, though this instructable shares the same with the technology but it varies in its "design". I have made the most simple yet powerful BT speaker using easily available materials and electronic components which are of less cost.

The whole project is completed with roughly around INR 500-650 / USD 10$. Hope you like this Instructable and try making one for you with your own desired shape and design.

So, why waiting lets get started..................

Materials Required:

1. Laminated Wooden Plank (Dimensions : L x B x H : 45 x 19 x 01 (in cms) - 1 Nos

2. Thermocol Sheet - 1 Nos

3. A2 size Black sheet - 1 Nos

4. Black Velvet Paper sheet - 1 Nos

5. Metallic Mesh Sheet - L x H : 01 x 01 (in mts) - 1 Nos

6. Plastic Mesh Sheet - L x H : 01 x 01 (in mts) - 1 Nos

7. Nails(3cms) & Screws(0.5cms) - Few

8. Velcro strip - 3 mts

Electronic Components Required:

9. 8ohm Speakers - 2 Nos

10. Bluetooth Receiver - 1 Nos

11. Prototype board - 1 Nos

12. LM386 IC - 2 Nos

13. 10K Potentiometer - 2 Nos

14. Capacitors - 1nf - 2 Nos, 10nf - 2 Nos, 47nf - 2 Nos

1uf - 2 Nos, 10uf - 6 Nos, 100uf - 2 Nos, 470uf - 1 Nos

15. Resistors - 10ohms - 2 Nos

68ohms - 1 Nos

16. LED - Blue - 1 Nos

17. Wires - Few

18. Diodes - IN4007 - 4 Nos

19. Voltage Regulator - 7805 (5V) - 1 Nos

20. Heat Sink - small - 1 Nos

21. Adapter port - 1 Nos

Tools Required:

22. Hawk saw Blade

23. Scissors

24. Glue Gun

25. Cello Tape

26. Cutter

27. Fevicol (white glue)

28. Synthetic glue

29. Soldering Gun and Lead

30. Multimeter

31. Ruler

32. Tweezer

33. Permanent Marker Black.

1. I have taken the wooden plank and divide & marked three sections to make compartments such that two are for speakers and one in the middle for the circuit board.

2. Then made 4 (four) 'D' shaped structures of length exactly equal to breadth of the wooden plank using the thermocol sheets.

3. Now glue the thermocol sheets and place the speakers in between them with a small gap in between the wooden plank and the speaker.

Note : This gap is a mandatory, because if the speaker touches the wooden plank that might add up unnecessary vibrations.

4. Leave it for few hours to dry and fix everything firmly in place.

5. Once this is done, take a black sheet and cut into strips of different widths and completely cover up the wooden plank and thermocol.

6. Once everything is covered up, it is time to complete the circuit.

1. The bluetooth receiver which is available in online for not more than ₹200 or 3$. Usually this module is powered by USB interface with 5V.

2. So, to power this bluetooth module I made a 5V power supply circuit using the Bridge circuit and a 7805 voltage regulator.

3. Opened the bluetooth receiver and soldered two wires at the +ve and -ve terminals.

4. Then comes the amplification circuit. I have made a simple amplification circuit using LM386. Using a general purpose board I have made two similar circuits, to amplify each speaker individually.

5. Then I have completed the circuit part by assembling the the bluetooth module to the amplification circuit using the 3.5mm jack.

1. Once the circuit is made everything is put in the middle segment and properly glued using silicon glue gun.

2. The speakers wires are connected to the circuit and power supply is given using the 9V adapter. Once the device is switched on the volume is adjusted in each speaker using the 10K potentiometer.

3. Calibrate the speaker to the optimal audible range as volume can be only controlled digitally using the mobile phone.

4. Once the calibration is done, do a final check and close the segment using a black velvet paper.

5. I have put some logo of mine made with hot silicon glue. The Blue LED glows when the device is switched on as an indication purpose.

1. Once building the device is completed it needs to be finished by covering it so it looks like a speaker.

2. I've used a metallic mesh which is cut into the dimensions accordingly and folded the edges which are sharp.

3. Then accordingly drilled small holes into the backside of the wooden plank at the both borders along its length.

4. Using small screws fixed the metallic mesh as shown. Then to cover it up I've used a synthetic grey mesh which is kind of a plastic sheet brought from a hardware shop.

5. To fix the final outer layer I used the velcro strip. I have glued one side of the strip to the grey plastic mesh and other side to the backside of the wooden plank exactly beside the metallic mesh.

6. Similarly covered the to sides first with metallic mesh and then plastic grey mesh and made some markings using a black permanent CD marker to hide the glue marks.

7.Finally fixed a wall holder to back side and made two silicon glue half ball like structures and placed them with an appropriate gap in between them.