[Photo] NE5532 20W pure class A amplifier driven in parallel


20553 pure class A power amplifier driven by NE5532 in parallel

There are many well-made power amplifiers abroad, and the output power is not large, but its sweet and elegant music is often unmatched by many high-power amplifiers.
The power amplifier introduced in this article, although its components can be used in general, and its output power is only 20W, but its musical expression is extremely outstanding, especially for the replay of classical music.

[Circuit principle]
The circuit is shown in Figure 6-1. Two sets of independent operational amplifiers (NE5532) are used in the local circuit to form two complete single-ended amplifiers. They all work in pure class A mode, and each independently constitutes a full Waveform amplifier. The amplified signal is then organically mixed at the output point, effectively reducing the odd harmonic distortion that is extremely harmful to the sound quality. The bipolar diodes (VT1 and VT2) of the excitation stage, as current control devices, directly draw the required base current from the output of the op amp, which is an ideal way to use. VT3 and VT4 are used as the constant current source load of VT2 and VT1 respectively, which guarantees the stability of the whole machine and also makes the machine free from troublesome debugging procedures.
The VT1 and VT2 of the excitation stage and the two high-power transistors of the output stage constitute a cross-coupling mode. Due to the clamping effect between the working points of the diodes, the stability of this circuit is excellent, and there will be no inrush current sound when the power is turned on. Another benefit of cross-coupling is that the excitation stage and the output stage request operating current from the positive and negative power supply terminals, which is very beneficial to improve the common mode rejection ratio of the amplifier. The working current of the excitation stage is up to 85mA, and the working current of the output stage is as high as 1.7A (two tubes in parallel). Due to the large current of this machine, each transistor (including excitation stage and constant current source load transistor) must be equipped with a sufficiently large heat sink, and the power transformer must have sufficient margin (recommended 150W) . Because this machine has strong adaptability to the power supply, the power circuit only needs simple rectification and filtering. Those with conditions can add 1 ~ 2H inductance in the power supply loop to get better results.

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