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Alternating Current amplifier appears APPENDIX balance resistor bias supply bridge balance bridge circuitry bridge networks bridge output calculated characteristic curve circuit Fig complete bucking conductance constant voltage modulation current bias current source d.c. bias d.c. current d.c. techniques d.c. voltage data peaks detection bandwidth detector input Direct Current dl/dV dV/dl dynamic resistance electronic Figure flicker noise four-terminal connection frequency Fundamental a.c. harmonic distortion I-V characteristic impedance Instr J. G. Adler J. S. Rogers Johnson noise junc junction lead resistances Kelvin double-bridge LEAD RESISTANCE EFFECTS load line lock-in amplifier low-pass filter modulation broadening noise level noise sources OHMS Phys Practical circuitry pre-amp Random Tunneling ratio reactance reduce result Rowell second derivative measurements shot noise signal signal-to-noise single-bridge source impedance Straus superconducting swept Taylor series Thermal Broadening three-terminal total instantaneous transformer tunnel junctions tunneling experiments V/dl voltage biasing VOLTAGE MEASUREMENTS Wheatstone bridge