Circuit of RIIA phono pre-amplifier with op-27
The op-27 is used in that circuit as phono pre-amplifier for your
characteristic of low noise.
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 75µsec. For initial equalization and
stability, resistors metal-film and capacitors of film of polystyrene
or polypropylene are recommended.
Filter
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.
For more information to do
download of the datasheet of the op-27
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Tags: Phono Amplifier op-27
Reference: collection of amplifier circuit
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