When using a 15 ~ 50W power amplifier IC such as TDA1521, LM1876, TDA1514, TDA72294 to make a two-channel power amplifier, if only a pair of 220μF capacitors are used for power filtering, what will happen? Will the treble be dim, the mid-tone will be fuzzy, the bass will be weak, or even not work properly? Don't worry, when playing at a moderate volume, in addition to the large exchange sound, the middle and high trebles are as clear, and the bass is powerful enough. Only when the dynamic bass is amplified at the maximum volume (above 30W) will the self-excitation occur. It can be seen that to make the power amplifier work properly, the filter capacitor should not be very large. If the filter capacitor is compared to a pond, it only has a smooth wave (filter) effect on the water flow (current). As long as the capacitor capacity is large enough, the impact on the current output, that is, the sound quality, is less.
Many low-end power amplifiers use only a pair of 1000μF filter capacitors on the power amplifier board. The hum of this type of power amplifier is more obvious. But don't rush to change the filter capacitor first when playing motorcycle. Many 50W IC power amplifiers and discrete power amplifier power supplies are filtered with 1000μF capacitors. You can no longer hear the hum during playback, you ca n’t hear it with your ears attached to the speaker, and the sound at the maximum volume will not be self-excited. Therefore, low-end power amplifiers such as motorcycles may wish to start from the front-level board and circuit, and maybe eliminate the hum without too much cost.
Practice has proved that making 10W power amplifiers such as TDA2030, TDA1521, TA7240, etc., filtering with 2200μF capacitors? Making 50W power amplifiers such as TDA1514, LM3886, TDA7294, and filtering with 3300μF capacitors; making 100 ~ 200W power amplifiers, using the filter itself, using 4μF capacitors, and using the filter Effect. Although the sound quality may be better with a large water tank capacitor, for most audio enthusiasts, there is no fever-grade ears, no fever-grade software and hardware, it is difficult to hear this difference.
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