Bluetooth Speaker Amplifier Circuit

The project is about making a Bluetooth sound speaker circuit. This circuit will pair directly with a device such as a phone or laptop. Bluetooth works using short-range radio waves, for this process the circuit don’t need any internet connection.

This means that, Bluetooth will work anywhere with two compatible devices. For this you don’t need to turn on Bluetooth all time. When you need to connect with speaker through Bluetooth, just then turn on Bluetooth and connect to your compatible devices.

The article is being published in collaboration with JLCPCB. They supply high quality PCBs at a very reasonable price. They also can provide SMT circuit assembly.

We thanks to our sponsor JLCPCB for sponsoring us PCBs for this project circuit.

For SMT Service, Click here - https://cart.jlcpcb.com/quote?orderType=1&stencil...

Thanks To JLCPCB.

$2 for 1-4 Layer PCBs.

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For making this useful project circuit, we might need some simple electronics component. You also can order assembled PCBs form JLCPCB. JLCPCB have its parts library. To check JLCPCB parts library, click here - https://jlcpcb.com/parts

All Component list have to been given below –

Component List –

1. Sound IC – TDA 2616

2. Mylar Film Capacitor – 2A 104J

3. Resistors – 2.2 Ω

4. Speaker *2

5. Power Source – Dual power supply

6. Bluetooth devices

7. Voltage Regulator – 7805

8. Capacitor - 100µf/ 16v

• COMBINING CONVENIENCE WITH GREAT SOUND
• Equalization
• VERSATILE PORTABILITY
• VISUAL EFFECTS
• RUGGED DURABILITY
• Bass and treble controls
• Mediocre sound quality

The final schematics and PCB design can be seen above.

To make this Bluetooth sound speaker, 1st we need to make a amplifier circuit. To make this amplifier circuit, we are using TDA – 2616 sound IC. It is a stereo sound IC, that can make high quality sound.

1st We Connect 3 & 8 No Leg Of Sound IC

Then we connect Mylar Film Capacitor with 1, 3, 8 and 9 no leg of sound IC. Then we connect 2.2 Ω resistor with the circuit. We connect this resistor with 4 and 6 no leg of sound IC and connect it’s other terminal with empty leg of Mylar Film Capacitor that is connected with 3 and 8 no leg of sound IC.

Now we need to connect power supply and audio input cable and sound speaker with the amplifier circuit. To operate this amplifier circuit, we need dual power supply circuit.

Dual Power Supply Will Provide Us DC “+20v”,” +40v” And “G” Voltage.

Now, We Connect Power Supply With The Amplifier Circuit. Connect “DC +40v” With 7no Leg Of Sound IC, “DC +20” With 5no Leg Of Sound IC & “G” Voltage With 8no Leg Of Sound IC.

Since we want to make this amplifier circuit, as a Bluetooth sound speaker, for this we need to connect a Bluetooth devices with this amplifier circuit.

Bluetooth device can be operated using only DC-5v. For this we need to use a voltage regulator IC-7805 and to filter the voltage, we use a electrolyte capacitor.

After complete power connection of Bluetooth device, then we connect audio input cable with the Bluetooth device. Now connect audio input cable other terminal with the amplifier circuit.

We connect it’s “L” cable with Mylar Film Capacitor, that is connected with 1 no leg of sound IC. Now we connect “R” cable with Mylar Film Capacitor, that is connected with 9 no leg of sound IC and “G” cable with 8 no leg of sound IC.

Since it is a stereo amplifier circuit, for this we need to use 2 pieces sound speaker. We connect speaker cable with the circuit. Connect “r” side speaker cable with 6no & 8no leg of sound ic. And connect “l” side speaker cable with 4no & 8no leg of sound IC.

Now we tightly connect your sound IC and voltage regulator IC – 7805 with the heat sink

Our circuit is completely ready for use now. Just plug-in power & connect Bluetooth with mobile and laptop and play song/music.

Enjoy the music.

If you complete design of your PCBs, then it is time to order PCBs. To order best quality PCBs, just visit JLCPCB and click on the “QUOTE NOW” button.

Since 2006, JLCPCB continuously driven to become more efficient and to reduce costs. They promise to offer customers the most economic PCBs forever. JLCPCB makes cheapest but top quality PCBs possibly because of scale effect, extremely high production efficiency and less manpower cost.

You can order minimum 5 pieces PCBs for only $2 costs.

To order PCBs, make your Gerber file. Then drag and drop the Gerber file on the following box.

Click on “Gerber Viewer” button you can check the PCBs design. Make sure everything is good, then choose color, quantity and order your PCBs at very reasonable prices.

If you are a new user, then you can order 10 pieces PCBs, costing only $2. To place your order click on “Save to Cart” button. Confirm your shipping address and shipping method.

To order your SMT PCBs, visit JLCPCB.

1. Drag and drop SMT PCBs file on site.

2. Choose your PCBs color and quantity.

3. To free SMT assembly for your PCB click on “SMT Assembly” button and then confirm.

4. Add your BOM file and CPL file.

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JLCPCB supported all shipping method can be seen below.

Estimated Delivery Time -

• DHL International Express 3-5 business days
• UPS Worldwide Saver 3-6 business days
• S.F Express(Standard) 5-8 business days
• S.F Express(Economy) 8-15 business days
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• PostLink Registered Mail 15-20 business days
• ePacket 15-25 business days
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To confirm your order, pay your payment. Then accept PayPal, Credit/Debit Card, Prepaid Wire Transfer. To manufactured your PCBs, it’ll takes about 2 days. DHL will be fastest shipping method to arrive your ordered PCBs at your location.

All PCBs were well packed and quality was really good.

Thanks to JLCPCB for best quality PCBs.