- 6Mixer channels Circuit
Many friends ask me, an audio circuit MIXER for different applications. I’m going to circuits that can make you start as you wish. These can be requested in modules of entries for each circuit, depending on what you intend the mixer, the same place as the number of input channels that you file. Below I have a lot of circuits with different levels of quality and complexity. All circuits, and proposes that they are easy to maintain a very good quality. For those interested, they have little patience. Soon I will give the project the professional level of the combination of audio signals console.
In Fig. 1, the main draw of the mixer is 6ch. It consists of 6 input channels. Channels CH 1-4 channels are in mono. The route you choose for this place where you can input connection, balance or be IMBALANCE [symmetrical or asymmetrical] have PHANTOM POWER electret microphone, with different input connectors. Channels CH 5-6, are intended to be used in stereo. The number of input channels can increase as long as you want, the choice between mono and stereo channels. Further details on the input circuits I separately for each circle. The output of each channel to drive the RV1-6, regulation potesometer sound level.
With RV7-12, we create the conditions for equilibrium between two channels [potesometer Panorama [MIX]]. All signals of input channels at this stage are added to two adders [IC1A-b], where each channel has two trimmer TR1-2, the profit of each IC to settle, adjust the level of production signal in the plane we want. They can be removed if you need anything. The next step is an equalizer [Fig. 9], Book III of the Regulation. The แ IC3-B to form the output of the mixer, they have a profit and they are essential isolation of the previous steps, with the unity we seek. Who they want, there is a headphone drive classic helmet to give IC2A-b production in jf13. It may also be present, but also optical indication of audio level meter with a stereo. Circuit, you can choose between what I give in the category of VU meters, or others that you want. The range of individual circuits is the power, connect the JF12b in touch and gives a series of constraints, the likely need. .
Part List
| R1…..12=4.7Kohms | RV1….4=47Kohms Log. [Fader] | C19-20=220uF 25V |
| R13…..24=10Kohms | RV5-6-13=2X47Kohms Log. [Fader] | Q1-3= BD139 |
| R25-26=22Kohms | RV7….12=10Kohms Lin. pot. Log. | Q2-4= BD140 |
| R27-30-34-39=100ohms | TR1-2=4.7Kohms trimmer | IC1-3=NE5532 |
| R28-29-36-37=100Kohms | C1….8=10uF 25V | IC2=NE5532 – TL072 |
| R31-42=10Kohms | C9-11=47pF ceramic or mylar | JF1….6=XLR Female Plug |
| R32-41=4.7Kohms | C10-12=47uF 25V | JF7….11= RCA Female Plug |
| R33-40=10Kohms | C13-14=100uF 25V | JF13=JACK Female Plug |
| R35-38=47ohms | C15-16=2.2uF 16V [C17-22=No use] | |
| All the Resistors is 1/4W 1% metal film | C18-21=100pF ceramic or mylar |
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