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4 microphone mixer
This circuit is often used in panel discussions or meeting rooms to capture the audio from all partners without the need to give each a microphone. Putting this in the middle of the table captures the audio from each of them through which is formed by four electret capsules with a level control for each individual receipt.

We can say that This circuit consists of a hand of four electret modules, each providing power to the capsule through the resistance of 10 k Ω, DC blocking capacitor through 1 uF and put that sign on the end result AF a potentiometer that serves as a reception setting.

opposite end point becomes mute ground to allow that side of the table while the central point is derived from the final signal output. The 100 k Ω resistors and FET transistor form a summing network and pre-amplified signal something which can be applied without problems in both line input and a microphone channel a console. WIRING

output type must be shielded to prevent the resulting sound is "invaded" by interference or noise.

Another recommendation that is not in the scheme is to place a 100 nF capacitor between + V and PCB mass within the unit.
potentiometers to adjust the sensitivity of each of the microphones. This is useful when one side of the table there are more people than the other or when a person speaks too high compared to others. Food

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§ V max: simple DC 9V
§ I max: 0.1A