DIY Simple Bluetooth Speaker Circuit

Today music is everywhere and it has become part of our daily life; people like to carry small portable speakers in bag, while travelling or in room.

Also, building our own Bluetooth speaker is not difficult, we can assemble it with a few simple components, such as a battery, a speaker, and a Bluetooth module.

Therefore, this DIY Simple Bluetooth Speaker Circuit is a low cost, easy to build and enjoyable project.

Circuit Working:

Parts List:

Components	Values	Quantity
Semiconductors	Li-ion Battery 3.7V	1
	Bluetooth Module 3.7V to 5V input inbuilt audio amplifier	1
	Speaker 4 ohm 3 watt	1

Circuit uses only three parts 3.7V battery, Bluetooth module and 4 ohm 3W speaker.

Battery give DC power to module and module has small amplifier IC, which take power and send sound to speaker.

After that, phone connects by Bluetooth and music go wireless to module and then this module make it strong and speaker make sound.

Battery + connect to +B of module and Battery – connect to –B of module.

Finally, speaker two wire connect to audio output of module.

Formulas:

The following general formulas explain the DIY Simple Bluetooth Speaker Circuit:

Speaker Power = V^2 / R

here,

• V is effective voltage from amplifier
• R is resistance of speaker.

Example: If amplifier give around 3.5V RMS and speaker is 4 ohm

Power = (3.5 x 3.5) / 4 = 3.06 Watt approx.

So a 3W speaker is suitable.

Battery Life = Battery capacity (mAh) / Load current (mA)

If battery is 2000 mAh and module with speaker take 500 mA average

Battery life = 2000 / 500 = 4 hours approx.

How to Build:

To build a DIY Simple Bluetooth Speaker Circuit follow below steps for connection:

• First, gather all the components as shown in circuit diagram
• Next, connect battery +ve to module pin marked + and connect battery -ve to module pin marked -B
• Now connect speaker + wire to audio output + of module and connect speaker – wire to audio output – of module
• Also, keep battery fixed in box and keep module fixed on board
• Lastly, connect speaker in front side of box for better sound

Conclusion:

Overall, this project tell how to make DIY Simple Bluetooth Speaker Circuit with just few parts, also we can learn to connect battery, module and speaker.

All parts go inside small box to make portable speaker and it is simple fun for beginner and good for our daily music.