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