Recycled Portable Bluetooth Speakers
by Amit_Jain in Circuits > Speakers
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Recycled Portable Bluetooth Speakers
![temp_-1194215837.jpg](/proxy/?url=https://content.instructables.com/FI6/INWM/J7UQSCNA/FI6INWMJ7UQSCNA.jpg&filename=temp_-1194215837.jpg)
Hi All,
I feel good about recycling and in this project, I recycled 3 items
- Speakers : extracted from old desktop speaker
- Lithium ion battery from old laptop
- Wood from left over / discarded stack
Features
- Bluetooth / AUX in/ FM/ TF card
- Ultra thin ( just 50mm)
- Volume control
- Remote control
- 6 to 9 hr battery backup
- Weight Less than 500 gms
- Recycles speakers total output : 6 W
What Do We Need
![temp_-690021390.jpg](/proxy/?url=https://content.instructables.com/FR9/W0PV/J7RS6VHH/FR9W0PVJ7RS6VHH.jpg&filename=temp_-690021390.jpg)
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Material
- 2 Speakers ( 3 W each)
- PAM8403 Amplifier with volume control ( 3w+3W)
- MP3 / Bluetooth kit
- 2 Li Ion Battery (18650)
- TP4056 with Battery protection
- 2 DC step up boost - MT3608
- Wires
- PlyWood
- Switch - push button
- Screws ( I extracted these from the original speakers
- 8 screws to hold speakers
- 8 screws to hold the back plate
Tools
- Hammer
- Fevicol / PVA glue
- Black Spray paint
- Soldering iron / wire
- Hot gluegun
- JigSaw with wood blade
- Paper tape
- Sand Paper ( 80, 150 and 220 Grit )
Frame
![temp_-488262063.jpg](/proxy/?url=https://content.instructables.com/FHE/DLBC/J7RS6VIT/FHEDLBCJ7RS6VIT.jpg&filename=temp_-488262063.jpg)
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To hold all the assembly, we will use 10mm plywood.
- Cut a 2 pieces each of
- 45mm X 180mm
- 45mm X 100mm
- Fix them at the edges at 90° as shown
- Use fevicol or PVA glue
- Use paper tape to hold all pieces in place
- Let it dry for 4 hours
- Using 80 grit sandpaper, make the edges smooth and straight
Front Side
![temp_-1047276795.jpg](/proxy/?url=https://content.instructables.com/FHI/VC86/J7RS6VKQ/FHIVC86J7RS6VKQ.jpg&filename=temp_-1047276795.jpg)
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![temp_1350351977.jpg](/proxy/?url=https://content.instructables.com/F41/GQPF/J7RS6VPN/F41GQPFJ7RS6VPN.jpg&filename=temp_1350351977.jpg)
- Cut a 180mm x 110mm plywood or MDF ( 4 mm thickness)
- Make 45mm diameter holes for speakers, Note that my speakers were 50mm diameter
- Cut appropriate holes for
- Bluetooth / MP3 plate
- Volume control ( PAM 8403)
- Switch ( Not show in images, as I forgot and I added it while working on the electronic stuff )
- Spray paint black ( glossy) as shown
Back Side
![temp_1453191958.jpg](/proxy/?url=https://content.instructables.com/FCM/QR32/J7RS6VM1/FCMQR32J7RS6VM1.jpg&filename=temp_1453191958.jpg)
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- Cut a 180mm x 110mm plywood or MDF ( 4 mm thickness)
- Drill two hole for 16mm dia meter tube for bass as shown
- Add required holes for TP4056 ( micro usb in)
- and LED indicator ( I use a piece of stirrer for led indicator)
Inside
![temp_1217835810.jpg](/proxy/?url=https://content.instructables.com/FOK/PAZ2/J7RS6VM5/FOKPAZ2J7RS6VM5.jpg&filename=temp_1217835810.jpg)
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- Now to fix the speakers, we need to cut a mdf sheet (4mm thick) as shown
- For battery fix two holder as show, we will hot glue battery on these, later
- Let it fry for 4 hours
Electronic
![bluetooth 2.png](/proxy/?url=https://content.instructables.com/F4G/R43S/J84QURO0/F4GR43SJ84QURO0.png&filename=bluetooth 2.png)
![temp_1324886858.jpg](/proxy/?url=https://content.instructables.com/FTA/BNAZ/J7RS6VO3/FTABNAZJ7RS6VO3.jpg&filename=temp_1324886858.jpg)
- Follow the logical circuit diagram ( each single line represents both positive and negative wires)
- TP4056 is connected to battery and two MT 3608
- MT3608 is set at 5 V for PAM8403 and 9 V for Bluetooth Kit
- Output from Bluetooth kit is connected to input of PAM8403
- Two speakers are connected to PAM8403
- Test the circuit before Assembly
Putting All Together
![temp_-611504801.jpg](/proxy/?url=https://content.instructables.com/FLX/56XJ/J7RS6VOT/FLX56XJJ7RS6VOT.jpg&filename=temp_-611504801.jpg)
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Putting all together is difficult and take time, I fixed thing in following order
- Power switch
- PAM8403
- Speakers
- TP4056 and MT3608
- Battery
- Bluetooth kit
Pre-solder long wires to PAM8403, bluetooth kit and TP4056
Hot glue things in place
Enjoy
![temp_2080493963.jpg](/proxy/?url=https://content.instructables.com/FPW/ZUAN/J7RS6VQZ/FPWZUANJ7RS6VQZ.jpg&filename=temp_2080493963.jpg)
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After all the wiring is done, close the back panel. I used 8 screws to ensure no sound leakage.
Test it using different inputs like FM, USB etc
Improvement for furture
- My speakers were 2w and output 3w, so disturbance at high volume
- Current limited by TP4056 at high volumes, due to high current pulled by amplifier
Please share your comments, if you liked it