NE5532 parallel drive 20W pureroa power amplifier ----- 20W Class A Power Amplifier

NE5532 Centrally driven 20W pureroa power amplifier, 20W Class a Power Amplifier Keywords: NE5532 parallel drive 20W pureroa power This circuit is provided by Aishan Leshui netizen. It seems to be from Japan enthusiasts. There are many well-produced power amplifiers in foreign countries, and the output power is not large, but its sweet and elegant music is often unable to match the large power amplifier. This amplifier introduced in this article, although its components are used in general, their output power is only 20W, but its music expressions are extremely outstanding, especially for the replay of classical music. [Circular Principles] As shown in Figure 6-1, the two sets of independent op amps (NE55532) are used in the motor circuit form two complete single-ended amplifiers, and they are working in purel. A full-wave amplifier excellent performance. The zoomed signal is mixed in the output point, effectively reducing the wonderful harmonic distortion of the sound quality harm. The bipolar diode (VT1 and VT2) of the excitation stage is a more ideal method of use directly from the output of the op amp. VT3 and VT4 are used as the constant current source load of VT2 and VT1, respectively, ensuring the stability of the whole machine, which also enables this unit to avoid trouble-free debugging procedures. The two high-power triodes of the excitation level and the output stage constitute a cross-coupling method. Due to the clamping between each diode operating point, the stability of this circuit is excellent, and the impact current sound does not appear in the powerway. Another advantage of cross-coupling is that the excitation level and output stage are strip working current from the positive and negative power supply terminal, which is very advantageous to increase the common mode suppression of the amplifier. The motif-level operating current is up to 85mA, and the output stage is more than 1.7A (two tubes in parallel). Since the current is very large, it is necessary to give each triode (including the excitation level and constant current source load triode), and the power transformer must have sufficient margin (recommended to 150W). . Since the unit has strong adaptability to the power supply, the power supply circuit only needs to be simple and filtering. Conditioners can get inductive inductances from 1 to 2 hours in power circuitry to achieve better results.

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