Powerful subwoofer LM3886


In music playback, perfect bass reproduction not only enhances the sense of music, but also increases the sense of presence and reality. This article introduces a small but powerful energetic subwoofer, which is very suitable for application in the audio system of multimedia computers, or to enjoy music in a small home environment, so that you can easily soak in the music Here, melt into the game and experience the true feeling.
The circuit part of the subwoofer is shown in Figure 1. The circuit principle of the active bass amplifier is almost the same. It is basically composed of a low-pass filter and a power amplifier. This circuit is no exception. A 120Hz low-pass filter is formed by the well-known NE5532, which filters out the input signal above 120Hz. Then, it is sent to the famous LM3886 power amplifier integrated circuit for power amplification, and the strong and powerful subwoofer signal is sent to the speaker. The sound of the high-power integrated circuit LM3886 is very good. Although its size is not large, its effect is better than that of the general discrete transistor amplifier.

The structure of the subwoofer's speaker is shown in Figure 2. This subwoofer uses a Shanghai Yindi 734X 8-inch PP basin woofer. Because the LM3886 pushes the 8-inch cabinet with a great sense of volume, this cabinet adopts an inverted structure to extend the lower limit of low frequency as much as possible, so that it can truly reproduce the elastic and thick bass. It should be said that the reasonable design of the low-frequency reproduction of the labyrinth speaker is better than other forms of speakers, but it is more difficult to produce under amateur conditions, which is not used in this article. After the box is made, the asphalt is about 0-5 to 1 cm thick, and then the acrylic cotton 1 cm thick is glued to install the circuit.

This speaker is equipped in the original multimedia sound, forming a 2? 1 type or combined in the original home speaker using only 6? 5 inches of speakers in the home audio, the effect improvement is quite obvious.

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