This is an optimized version of the passive preamplifier tone board, the circuit uses the quantised version of the high and low tone adjustment circuit, and the sound details rich This amplifier board uses the high-performance NE5532 IC which makes the device especially suitable for application in high-quality and professional audio equipment, instrumentation and control circuits, and channel amplifiers NE5532 IC allows better noise performance, improved output drive capability and considerably higher small-signal and power bandwidths
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