I want to know what is the physics behind a crystal radio What does the resistor

Question

I want to know what is the physics behind a crystal radio What does the resistor do ? What does the capacitor do ? What does the coil do ? What earphone do ? What does the diode do ? What are the physics behind it ? I want to know what is the physics behind a crystal radio What does the resistor do ? What does the capacitor do ? What does the coil do ? What earphone do ? What does the diode do ? What are the physics behind it ? What does the resistor do ? What does the capacitor do ? What does the coil do ? What earphone do ? What does the diode do ? What are the physics behind it ?

Explanation / Answer

the resistor, capacitor and inductor coil form a band pass filter in the crystal radio. the combination is so chose to the set the radio to a suitable frequency. The ear phones are not only to hear the voice from the radio but would also act like a small antenna to collect EM waves from the radio station.

The diode is used in reectification of the signal which is transmitted into the air. The audible frequency is allowed through the band pass filter and carrier frequency (high frequency) wave is eliminated. This is done by the diode.

The incoming waves serve as a small battery to run the crystal radio. The electical pulses and the magnetic field due to the coil are perpendicluar so that the third phase or axis provides mechanical waves (sound). The change in electrical and magnetic pulses causes sound waves.

crystal radio captures the radio wave and converts into audio waves

resistors opposes the flow of charge /energy

Capacitors stores electric energy

coil stores magnetic energy

Earphone convert electrical pulses into sound waves

diode converts an Alternating current into direct current.

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