For Pre amplifying of signal of low potency, the earnings of the amplifier can be increased, reducing the value of R1 in agreement with the formula:
For a version stereo, they are necessary two same amplifiers
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Performance of the circuit: (Vout = 6Vrms, R1=4k©)
T.H.D @ 100HZ = 0.0025%
@ 1KHZ = 0.003%
@ 10KHZ = 0.011%
Relationship sign noise p5; 80dB
answer = ±0.4dB from 10Hz to 20Khz
Band with = -3dB @ 56KHz
For more information to do download of the datasheet of the op-50
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