Circuit of RIIA phono pre-amplifier op-27

  
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He only contributes with 3. 2nV/ HZ of noise tension and 0. 45pA/ HZ of current noise to the circuit. To minimize the noise of other sources, R3 it is configured for 100 ©. That generates tension of noise additional of only 1. 3nV/ HZ. R1, R2, c1, and c @ form a net RIAA of a lot of precision with standard components supplying the necessary constant of time of 3180, 318 and 75 µsec.
Circuit of RIIA phono pre-amplifier op-27 - schematic

For initial equalization and stability, resistors metal-film and capacitors of film of polystyrene or polypropylene are recommended. Capacitor C3 and resistor R4 forms a simple filter of -6dB for octave, with cut to 22Hz. That circuit is capable of very low distortion on the entrance sign, usually below 0. 01%. To 3v of total harmonic exit produced distortion is smaller than 0. 03% in the frequencies above 20KHZ.



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