Stereo sound balancer

  
It many times happens, we want erase or decrease in a musical song, the voice of singer or some other sound that usually is written in same level and in the two channels. If we remove between them two signals of channels, we can take in the output a mono signal without the voice. Here exist a problem. The sound of bass instrument is also this written in two channels. With this circuit, the bass they can be not removed, if it is added in the signal [ L+R ], the signal [ L-R ]. The signal of low frequencies and the signal of difference, are applied in adder IC3?. The balance between, regulated from the RV1-2. In the circuit do not exist capacitors in the line of signal, because add undesirable drift of phase in the signal of input.
Stereo sound balancer - schematic

Attention should be given in the quality of materials of circuit. The resistors should anyhow be is precision 1% metal film. Elektor 8/89 Part List R1-2=100Kohm R13-14=5.6Kohm IC1-2-3=TL072 R3-4-5-6-10=10Kohm R15-16=100ohm RV1=100Kohm Log. R7-8-9=6.8Kohm C1-2-3-4-5-8=100nF ceramic RV2=250Kohm Log. R11=27Kohm C6=180nF 100V MKT R12=47Kohm C7=120nF 100V MKT All the Resistors is 1/4W 1% metal film



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