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operational amplifier - Explanation of 3 Tone Control Circuit - Electrical Engineering Stack Exchange
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TC3 Three Band Tone Control / Equalizer Kit (Bass, Mid-range and Treble) (Stereo)_Filter_Accessories Kit_Analog Metric - DIY Audio Kit Developer
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3band tone control using transistor – tataylino.com | Electronic circuit projects, Transistors, Diy amplifier
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