Dc_and_bridge_titles_and_descriptions

Published:2009/7/22 2:12:00 Author:Jessie | From:SeekIC

The circuit of Fig. 1-1A is adjusted to match a 40-dB RIAA curve (Fig.1-1B). With break points at 50, 500, and 2100 Hz, the entire curve is fixed by a specified gain at1 kHz. The circuit is designed for use with newer moving-coil magnetic phono cartridges, which have a sensitivity of 0.1 mV per CM/S (compared to older cartridges with sensitivities of1 mV per CM/S). The circuit is adjusted by injecting a low-level signal into TP-1, with the transformer disconnected. At 100 Hz, adjust C3A for an output level that is 6 dB lower than the low-frequency output. At 1000 Hz, adjust R8A for an output level 20 dB lower than the low-frequency output. At 21 kHz, adjust C4A for an output that is 40 dB less than the low-frequency output. Raytheon Linear integrated Circuits 1989, p 4-78, 4-79.



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