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NE5532 version: the use of new original NE5532 op amp chip, the use of round hole 8 feet IC socket, easy to upgrade the op amp chip. Using the patch process, the power input to increase the rectifier bridge, can AC and DC, the input DC do not have points positive and negative, and more convenient to use. Performance more stable, with the volume potentiometer. (DC input does not need to be divided into positive and negative poles) Working voltage: DC9-24V