Receivers {radio, machine}| can convert electromagnetic radio waves with frequency range near 10^-6 Hz to electric current. Radio waves carry sound information in frequency modulation (FM) or amplitude modulation (AM). An adjustable LC circuit {tuner} selects radio-station frequency. A circuit {filter, electronic} removes radio-station carrier frequency and leaves sound vibrations that ride on carrier wave {demodulation}. A tube or transistor amplifier increases amplitude. Speakers change electric current into sound, by vibrating an inductance coil attached to a paper cone.
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Date Modified: 2022.0224