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60 hertz amperes amplifier circuit amplitude antenna arrangement atom audio basic battery bias block diagram C₁ C₂ called capacitive reactance capacitor carrier wave cathode cathode-ray tube characteristic curves circuit symbol coil components conductor connected in series control grid coupling current flow DC Supply detector device dielectric diode electrical electronic power supplies elements emission emitter energy factors feedback free electrons frequency modulation grid circuit hertz high frequency impedance inductive reactance intelligence signal layer load magnetic field maximum megahertz modulation negative NPN transistor ohms operation oscillator circuit output circuit P-N junction P-type material parallel pentode plate circuit plate current polarity power supply primary pulse push-pull R₁ R₂ radiation radio waves rectifier circuit represented resistance resistor resonance secondary semiconductor series tuned circuit shown in Fig sine wave space square wave temperature transducer transformer transmission transmitter triode triode tube tuned circuit typical voltage volts waveform wire