Both LAG665 and LAG668 are single-chip player ICs. LAG668 is an improved version of LAG665, and the internal circuit structure of the two is roughly the same. For lovers of bass, LAG668 can be used to replace the original LAG665, and the corresponding external circuit is modified to achieve the improvement of the bass effect. The measures of low frequency boosting are usually high attenuation and middle frequency. After high and intermediate frequency attenuation, the signal is weakened at the same time, the excitation to the subsequent stage is reduced, affecting the audio sensitivity and dynamic effect, the volume is reduced, and the rated power output cannot be reached. The remedy is to increase the voltage gain of the previous stage; second, to increase the voltage amplification of the first stage; third, to increase the input impedance of the latter stage to improve the input sensitivity of the latter stage, and to meet the needs of the latter stage with less excitation; Is to increase the gain of the power amplifier. LAG668 uses the latter two measures, one is to increase the input impedance of the rear stage (attenuator) from 20k12 of LAG665 to 200kt2; the second is to increase the voltage gain of the power amplifier from 28dB of LAG665 to 38dB. As shown in the figure is the Walkman bass boost circuit, the tone network of channel 1 is the same as channel 2.
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