9 pages matching crystal radio variable-capacitor in this book
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Introduction to Radio
Simple Receiving Circuits
30 other sections not shown
alternating current amount amplifier circuit amplifier tube antenna applied approximately audio-frequency band carrier wave cathode characteristic curves choke circuit elements coil coupling crystal current flowing cycles decibel decrease diagram diode direct current distributed capacitance effect electrical electrons energy equal Example feedback filter circuit frequency modulation full-wave grid bias grid voltage heater impedance increase inductor input signal voltage loudspeaker maximum value meter microphone modulation negative ohms operation oscillator circuit output voltage pentode plate circuit plate current plate resistance plate voltage power amplifier power output power supply unit primary Prob produce quency r-f amplifier r-f signal radio receiver ratio reactance rectifier tube resistor resonant circuit resonant frequency ripple voltage screen grid secondary winding shown in Fig sound waves stage superheterodyne receiver tank transconductance transformer transmitter triode tuned circuit vacuum tube variable capacitor variation vary voltage amplification voltage drop volts watts wire zero