This circuit should be placed between a turntable and recorder or playback media from the input to equalize the old vinyl records curve matching it with modern equipment. Among the possible applications we suggest the conversion of old media (vinyl records) to modern media such as MP3, CD, etc. The circuit must have symmetrical power supply and the operational may be the 741. An excellent filtering is important to prevent any noise. Input cables and output signals cables must be shielded also to prevent noise. 4658 is a double 741 and the brackets are for the other channel using the same integrated. Can be used other equivalent to the 741 as the MC1458. The capacitor of 10 ?F to 1k resistor must be of tantalum, for higher gain stability. When assembling is also important that the board is designed so that the distances between the components as small as possible. We recall that the RIAA equalization attenuates differently frequencies of the audio track to match the characteristics of recording of vinyl records. Thus, in the reproduction this attenuation should be undone so that the sound recovers its original characteristics, which is achieved with the aid of this circuit.
