The active speaker amplifier I recommend to everyone uses two integrated circuit chips, namely LM 4766 and NE 5532. Among them, LM4766 is an audio power amplifier specially designed for digital circuits by American Semiconductor Company. It can produce 30W & TImes; 2 sinusoidal output power on an 8Ω load when it is powered by plus or minus 30V. It has large output power, no signal amplification, and simple circuit connection. advantage.
The pre-amplification part adopts NE5532 as a 10 times amplifying circuit. The coupling capacitor selects the German WIM polypropylene supplement capacitor. The large-capacity filter capacitor selects the Japanese ELNA electrolytic capacitor. The resistors use five-ring metal film resistors. The power amplifier circuit is shown below.
The power supply part uses toroidal transformer 100W double 18V. Powering NE5532 is done by 7812 and 7912. The rectifier uses 3A full bridge. The {6} and {11} pins of the LM4766 are the left and right channel Mute control pins, which can be controlled together or separately. (This connection method is controlled together by me. 6} feet and {11} feet are connected to {4} feet of LM 4766 respectively). The treble uses the silver flute YDQG5-2, the maximum power is 30W, and the bass selects the silver flute YD178-P, the maximum power is 60W.
After connecting all the circuits and devices, the sound of the audition is soft and beautiful, full and flexible, especially the shocking effect displayed when playing 3D games is really indescribable. 
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