Example image of eyePlorer eyePlorer map for 'Electronic amplifier': Power (physics) Signal (electronics) Power supply Gain Conductance Decibel Transconductance RF power amplifier Transmission line Bipolar junction transistor Common base Common collector Common emitter Common drain Common gate Common source Field-effect transistor Negative feedback Two-port network Oscilloscope Feedback Servo DC motor Torque Electromagnetic spectrum Radio frequency Receiver (radio) Transmitter Audio amplifier Sound recording and reproduction Loudspeaker Operational amplifier Transformer Direct coupled amplifier Printed circuit board Reginald Fessenden Vacuum tube Integrated circuit Parametric oscillator Analogue electronics Electrical efficiency Electronic amplifier Linear amplifier Pulse-width modulation Delta-sigma modulation Electrical load Watt Audiophile Preamplifier Recording studio