It is no stranger to talk about some old qualified DIY fans of NE5534. Although the NE5532 is used more, the sound quality of the NE5534 as a single op amp is obviously much better than that of the NE5532. Headphone amplifier circuits made with op amps are common, but the current of the op amp is limited, and it is obviously too powerless for heavy-duty headphones or large dynamics.
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