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CERAMIC_CARTRIDGE_SYSTEM

2017-01-17 05:17  
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CERAMIC_CARTRIDGE_SYSTEM
Circuit using National LM389 opamp having three transistors on same chip provides required high input impedance for ceramic cartridge because input transistor is wired as high-impedance emitter-follower. Remaining transistors form high-gain Darlington pair used as active element in low-distortion Baxandall tone-control circuit.-“Audio Handbook,” National Semiconductor, Santa Clara, CA, 1977, p 4-33-4-37.