![]() ![]() If you regularly use more than one microphone, play music, or broadcast video gameplay on your streams, an audio mixer is a must for fine-tuning your sound. I am novice to the world of circuitry, so I have a few related questions: What is the purpose of the 1K resistors off the pot outputs? Could they be either lessened (.5K?) or done away with entirely? Would that lessen the gain loss? Is there any gain loss from the potentiometers themselves when they are turned to full volume? Attached is a partial diagram of what I built.An audio mixer takes multiple sources of audio and mixes, balances and combines them into one signal. There is a slight loss of gain (I’d guess 3-6db?) for each pair, compared to running the preamp directly into the recorder, but there is still more than enough gain. It is working very well, it’s dead quiet, I can’t hear any alteration/deterioration of the signal, and I can mix the two pairs however I like, just as intended. I’m running 2 pairs of Schoeps mics into a Fred Forssell preamp, then into the mixer, then two tracks out to a recorder. The jacks are all XLR, it has 4 dual ganged 10K potentiometers with 1K resistors connected to the 8 pot output terminals. I made a variation of this mixer, and have a few questions. ![]() Stick this partially peeled label to the enclosure's lid.Īlso, while you're at it, stick the input and output jack labels to the sides of the enclosure. It is only at this point that the label will be fully applied. At the end, you will need to be able to get underneath the corners of the label to fasten the case shut. The reason for doing it this way is because the enclosure's mounting screws will ultimately be hidden under the label. This is where having split-back sticker paper comes in very handy because you can peel only a little bit of the label at a time. ![]() To begin, trim the labels down with scissors and peel the top label such that the far ends still have their backings on. This actually makes it easier to build and debug the circuit. Secondly, understanding the constraints of the enclosure means that you have clearly planned ahead and know what needs to get done. Why invest a lot of time making something if it's hastily jammed haphazardly into a travel soap dish as an afterthought? The nicer you can make this, the less likely it will be to get thrown away some day. First of all, aesthetics are important and you should always make things that look reasonably good. However, I intend to show you how to do it correctly. If you want to ignore my methodology and go your own way, that is your business. There will be no soap dishes with wires sticking out of them in this class. Not only that, I am going to show you how to build them well. In most of these projects throughout this class we will be starting with the enclosure. Typically enclosures are made as after thoughts for electronics projects. This is the simplest audio mixer you can make, but hardly the best one. Otherwise, any time lines intersect, they should be connected together. Also, notice the strange half-loop to the right of the 1K resistor that is third from top? That loop represents a 'hop' in the schematic and means not to connect those wires together. The triangles next to each jack represent a channel. The three boxes that look like strange renderings of potted flowers are actually audio jacks with their barrels connected to ground. This schematic shows the left channels and the right channels being connected together through resistors. You are left with a two channel stereo mixer. The right channels can be mixed in identical fashion. If you connect each respective left channels to a 1K resistor, and the other end of each resistor together, then you have effectively mixed the left channels together. The easiest way to do this is to combine them together using resistors. If we want to combine two stereo signals into one, we will need to mix together the left channel of each stereo signal, and the right channel of each signal. A stereo signal is two channels (left and right) which are actually two separate audio signals with a shared ground. ![]()
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