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AIYIMA Pre amplifier Tone Board UPC4570C OP AMP Stereo Preamplifier Volume Tone Control Super OPA2604 AD827JN With LM317+LM337|tone control board|volume tone control boardstereo preamp - AliExpress
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5 (bass mid treble) Tone control circuits projects using NE5532, 4558, LF353 | Circuit projects, Audio amplifier, Electronic schematics
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