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Diy audio projects - electronics projects circuits, 177 diy audio projects. browse total 177 audio amplifiers, filters, generators, mixers audio preamplifier circuits. huge collection audio. http://www.electroschematics.com/audio/ Electronic circuit schematics - satsleuth, Electronic circuit diagrams / circuit schematics. general assistance specific design question electrical engineering. http://www.satsleuth.com/schematics.htm Amplifier bias boards sale - w4zt, This board built tl431 voltage reference chip tip147 pnp power darlington transistor. circuit data sheet tl431 . http://www.bias.gs35b.com/