Schematic: High-impedance preamplifier with MPF102 JFET. Easy to build. Battery-powered. Radio Shack stoc… | Circuit diagram, Buffer amplifier, Radio shack
Building JFET Preamplifiers for Musical Instrument Use. : 9 Steps (with Pictures) - Instructables
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Peppermill
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Building JFET Preamplifiers for Musical Instrument Use. : 9 Steps (with Pictures) - Instructables