Simple preamplifier schematic built around the NE5532 dual low-noise op-amp, a 405 KB PDF; the extra tag in the name only marks the source site. The NE5532 is a classic audio op-amp widely used in preamps, mixers and filters. The drawing is useful for building or repairing a basic line or microphone stage, checking gain resistor values and supply decoupling. Verify the supply voltage intended in the diagram, typically a split rail, and the pinout of the package you use.
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