1. LM2904ST Substitution Conclusion The feasibility of substituting the LM2904ST for the BA8522RFVM-TR is low, primarily due to significant differences in key performance parameters: the slew rate of the LM2904ST (0.6 V/µs) is far lower than the original part's 3 V/µs, which may cause distortion and sluggish response when handling fast signal transitions in audio applications; its gain-bandwidth product is only 700 kHz, severely insufficient compared to the original's 6 MHz, limiting its ability to amplify high-frequency audio signals; the input offset voltage is as high as 2 mV (vs. 100 µV for the original), introducing noticeable DC offset error that degrades audio accuracy and SNR; and its output current of 30 mA, lower than the original's 50 mA, may be inadequate for effectively driving low-impedance loads. These discrepancies indicate that the LM2904ST, as a standard general-purpose op-amp, lacks the performance required for dedicated audio applications. Direct substitution is not recommended unless the application has extremely low demands for bandwidth, speed, and precision.