Moving a motor with a stroke R201T / R211 series ----- UPGRADE you amplifier with ne5532

Keywords: NE5532, amplifier servo circuit Author: Yang Yongjie The bass of the R201T, the R211 series active speakers are unprofitable, and the strength is insufficient. The tall parsing is not meticulous enough, there is no spatial layer, and the music is unable to express music. Observing the space space is relatively large, but the material material is taken in the circuit board is real, the output of the power transformer is 12V × 2, 840mA, the power is only 20W, which is clearly unable to effectively push 3 TDA2030, replace it with a R type of 40W or more. Transformers, add an AC power filter in the input of the power supply. The rectifier diode is selected from the 1N53 series, and the current is small, replaced with a 1N54 series, and improve the original single bridge rectifier circuit as a double bridge rectifier power supply. The original filter capacitor uses 3300μF / 25V domestic ordinary capacitance, now add 2 4700μF / 25V Japanese chemical Nichicon audio special capacitance, then two German WiMA0.47μF / 63V CBB capacitance, the above measures can increase the power of the power supply reserve. The audio input coupling capacitor is then replaced into a French SOLEN 10μF / 25V freely polypropylene capacitor, and the remaining electrolytic capacitance can be replaced by a corresponding supplement capacitor such as Japanese ELNA, and the original, the original, the porcelain capacitance is upgraded to a high-grade polyester capacitor. All resistors from 1 / 8W on the board are all replaced with 1 / 4W Philips metal film resistance, and the YG4558 op boos of the subwoofer unit is replaced into the imported original NE5532. After the Mocha completing the machine, it can clearly understand the bass elasticity and powerful, and the performance is not forced when playing in a large dynamic large volume, and the sharpness of the medium and high frequency band has improved. This active speaker uses an electronic two-point frequency circuit, which is now incremented by a NE5532 op amp for transforming a power amplifier circuit that drives the satellite box. The circuit is shown in the drawings (only one channel is plotted). VD1, VD2 is selected 1 N4148. The resistor uses a 1 / 4W metal film series, and the capacitor is selected from Japanese ELNA. R1 is selected from the 0.56Ω / 5W imported cement resistance, the circuit is more concise, and only a small print plate can be made. After the short-circuit input test power amplifier output voltage, the output voltage below is required to be normal. If the output voltage exceeds 1mV, it is a problem that the servo circuit has problems, and the components that can be checked and the components around it can troubleshoot. Through this tapped, the listening comparison: the dynamic range of the playback sound field is greatly expanded, and the level of the medium and high-tone is very distinct. The original turbid listening feel has walked.