Commonly called “mix”, mixing consists of balancing the frequencies and volume of a number of audio sources. Typically, these audio sources come from microphones, midi sources or sounds synthesized by a computer or a synthesizer. Mixing can be done in studio or live, in real time, during the sound of a concert, for example.
In the studio, a sound engineer uses a mixer, also called a console, on which we find a large number of potentiometers, grouped in columns according to the channel they control. The purpose of the mix is then to harmonize the different tracks of a multi-track recording for the creation of a standard recording.
Mixing can also be done by a DJ (disc jockey) who mixes two recordings between them. Often, the DJ makes a transition between the end of one music and the beginning of another, which requires an adjustment of the volume, the tempo and the frequency. Nowadays, personal computers have become powerful enough to act as a mixer.
More and more independent artists are starting to use their personal computers for digital recording, audio editing and home studio mixing. In fact, a computer equipped with a sound card can produce a result of a quality that is similar to that which would be obtained in a professional recording studio. It should be known that audio and computer equipment does not is not the only condition of a good recording, mixing and mastering. But home studios can still be satisfying solutions for reasonable budgets. One just needs to know the purpose of mixer.
Some resistors are enough to make an ultra-economical passive audio mixer. Ideal for connecting an amp to two or more audio sources at the same time without having to unplug each cable and reconnect another! Here’s what a stereo, two-input stereo audio mixer looks like:
Realization and diagram of a stereo passive audio mixer amplifier
The left and right audio signals are connected by their respective resistance to the mixed output. All the masses are to be connected directly.
Any resistance value can be used between 1k and 22kOhms. Here, one can choose 10k, ultra standard value.
There is not even much need to build a case. An insulating plastic plate (or even tape to go fast) is enough to isolate the underside of the circuit board (if we ever put the mixer on a metal surface).
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