Circuit amplifier for headphone op-50 Amplifier Schematic for headphone using op-50

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:

R1=20K©/Av-1

For a version stereo, they are necessary two same amplifiers

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