4 microphones mixer circuit with TL081

  
A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is about 1 kohm. Two 9 volt batteries are used as power source.

4 microphones mixer circuit with TL081 - img1

Battery must be several hundreds of hours with alkaline batteries.




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