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5 Tone control (bass mid treble) circuits using NE5532, 4558, LF353
4 Channel DJ Audio Mixer Circuit - Part 1
Hi-Fi Stereo Preamp Circuit - ElectroSchematics.com
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PreAmp2 – BuildAudioAmps
STEREO_PREAMP - Amplifier_Circuit - Circuit Diagram - SeekIC.com
3 Low noise microphone preamplifier circuit using NE5532 LF356