PB Fortich

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  • Modular Phono Preamplifier

  • Created: Sep 11, 2014

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Summary


The Phono Preamplifier is a critical link in analog signal chain. The circuit features a very high input overload capability, very low distortion, and accurate reproduction of the RIAA equalization curve. It will provide a more life-like audio output by enhancing the bass and treble components of the sounds.


The two-stage op-amp circuitry in the RIAA equalization network is split in two halves: an input stage (IC1A) wired in a series feedback configuration, implementing the bass-boost part of the RIAA equalization curve and a second stage, implementing the treble-cut part of the curve by means of a second op-amp (IC2A) wired in the shunt feedback configuration. The IC1A is the LM833 which is a dual general purpose operational amplifier designed particularly for audio systems. The LM833 utilizes new circuit and processing techniques to deliver low noise, high speed and wide bandwidth without increasing external components or decreasing stability. The IC2A is the TL072 dual low-noise JFET-input general purpose operational amplifier. The TL072 has low input bias and offset currents and fast slew rate, it also has low harmonic distortion and low noise output. The 7815 and 7915 ICs are regulators which maintain the DC voltage levels at +15 and -15 volts respectively.


The characteristics of the device is ideally suited for high-fidelity and audio preamplifier applications. The device also optimize a sound mixer by pre-amplifying audio signals; it will compliment sonic characteristics of your cartridge and will optimize the sound quality of your audio output by providing improved clarity, deeper bass, and finer highs.

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