Abstract: A low-noise junction field effect depletion mode transistor amplifier and a signal retrieval network therefor is described. The junction (JFET) is used to amplify the signal from a piezoelectric transducer which forms the sensing element of a bone conduction microphone. A conventional transistor or Darlington pair is provided with a base electrode coupled to the source electrode of the JFET and a collector electrode coupled to the JFET drain electrode. The emitter circuit of the transistor includes a first voltage divider for feeding back a portion of the emitter signal to the base circuit of the transistor and another portion to the gate circuit of the JFET through the piezoelectric transducer. A second voltage divider is provided in the feedback path from the first divider to the transistor base to apply a portion of the base feedback signal to the JFET gate through the gate input resistor.