Audio Mixer (LBB)

Audio Mixer - Lab Bench Board
(Version 1.0)

Prototype and Simulation Stage

The idea is to connect an audio Bluetooth module into an audio mixer with the goal to control the left and right channel gain and overall volume.

After getting an idea on the desired functionalities, input and outputs, the circuit was built on protoboard.

Testing Stage (with Prototype)

Download a function generator app in your phone
- The Oscillator (for iPhone) Free
- Function Generator (for Android) Free
The Audio Mixer LBB output was connected to an oscilloscope and tested with different types of waveforms.
Oscilloscope: Keysight MSOX3012T - 100 MHz @ 5 GSa/s

Sine + Sine Waveform

Sine + Triangle Waveform

Square + Triangle Waveform

Design Stage

During design stage, Fusion 360 and KiCad were used to model the board and get an idea on how the board would look like.

Assemble Stage

The boards were manufactured by JLCPCB.

Assembled in house.

Testing Stage (with PCB)

The Audio Mixer LBB output was connected to an oscilloscope and tested with different types of waveforms.
Oscilloscope: Keysight MSOX3012T - 100 MHz @ 5 GSa/s
The Oscillator App for Iphones or the Function Generator App for Androids can be used to generate waveforms and transmit that information over Bluetooth to the Audio Mixer LBB.