How to Make Bluetooth Audio Receive Portable

In my computer setup, I use an ordinary amplifier whose line input is wired. Quite inconvenient when I want to move the audio source from PC to another device. I have to unplug the audio cable from the PC which is difficult to reach to connect to other devices.

therefore, I plan to change my amplifier to a bluetooth amplifier. That is the reason in this article I will create an "Audio Receiver Bluetooth module". I will make a module that is easy to use and operate.

The video gives you all information you need to build this project. however, for files like schematic and layout I can't provide it in the video.

for this file you can get it in this article. In the next step you can find a list of components, original schematic and layout files, gerber files, module datasheet and component libraries.

Components to make this module are quite few and easy to find. the following are the components required:

• Bluetooth module MH-M18
• Battery charger module
• Jack Audio 3.5mm
• Push Button
• Resistors
• Battery Holder
• Battery

This is the schematic and layout of the module. This is made using the eagle application. schematic and layout can be seen in the picture above.

In addition to the image above, I have provided the original schematic and layout files which can be downloaded below. this is the original file, You are free to change it to your liking but don't forget to include the source.

Because the library for the MH-M18 bluetooth module and several other components is not available in the Eagle application. I need to find or create my own librabary that is used.

I can find some libray on the internet, such as the battery charger module. You can download it here:

• Library Battery module

Aand for other components such as the MH-M18 bluetooth module, Push Button, 3.5mm Audio Jack and battery holder I have to make my own. below you can download the library that I made.

To make PCB 2 layer PCB with good quality. I use PCBWay services to make a 2 layer PCB for this project. You can see the finished 2 layer PCB in the image above

Reference link :

• High Quality 10 PCs PCBs for only $ 5 & new member First order Free: www.pcbway.com

The gerber file for this design can be downloaded below

1# Power Supply

Based on the datasheet, the default power supply of this module is 5V. To use a 3.7V battery, it is necessary to modify this modu by replacing the diode (designated) with an 0 Ohm resistor or directly connecting the pad.

2# Navigation button

There is one PIN in this module which functions for buttons. With 1 pin we can make 4 buttons with a resistor combination. Each button can work with a predetermined resistor.

Because the predetermined resistor value is difficult to obtain. I replaced it with a resistor that was close to that. i don't know if this works or not.

• Pause Button -> 51k replace with 47k
• Next/V+ Button -> 33k replace with 27k
• Pre/V- Button -> 9.1k replace with 10k
• ON/OFF Button -> 0R

Now is the time to insert the component. Insert one by one the components and make sure they are installed properly. to see this process in more detail you can see it in the video.

for the results you can see in the image above. And for testing the module you can see the video on YouTube.

for the record, here I will give a conclusion to the module that I have created. so the conclusion that I can give to this module is.

• Based on its function this module can be used to convert ordinary amplifiers into bluetooth amplifiers
• There are features that are not yet functioning properly, namely the button feature.

then I will try to upgrade this module to function better.

thank you for reading this article. see you in the next article