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Circuit diagram of a crystal radio receiver: File usage. No pages on the English Wikipedia use this file (pages on other projects are not listed). Global file usage.
Block diagram of a crystal radio receiver Circuit diagram of a simple crystal radio. A crystal radio can be thought of as a radio receiver reduced to its essentials. [3] [39] It consists of at least these components: [22] [40] [41] An antenna in which electric currents are induced by electromagnetic radiation.
English: Block diagram of a crystal radio, the simplest type of radio receiver which was invented in the early 1900s and widely used until vacuum tube receivers replaced it.
It consists of a crystal detector (semiconductor diode) DI connected between a long wire antenna and ground, with a sensitive earphone E1 attached across it. The diode rectifies the radio signals picked up by the antenna by conducting the RF current moving in one direction to ground, leaving a pulsing DC voltage across the detector.
English: A circuit of an inductively-coupled crystal radio receiver with impedance matching.This type of circuit, called a "two circuit" or "loose coupler" receiver, was used in most sophisticated crystal receivers from the wireless telegraphy era which ended in the 1920s, until today.
English: Circuit of a "two-slider" crystal radio receiver, a popular circuit used in simple crystal radios made before 1920. To tune in different stations, it used a tuning coil (L1) with two sliding contacts on it. It doesn't use a tuning capacitor, instead the coil resonates with the capacitance of the long wire antenna to create a tuned circuit.
Schematic Wiring Diagram of the Type SCR-54 Set. Its primary (antenna) and secondary circuits were both tunable by variable capacitance and inductance. A crystal detector (Type DC-1) and telephone circuit were connected to the secondary circuit. It could receive wavelengths from 250–550 meters (545 to 1200 kHz).
English: A crystal radio receiver circuit that uses impedance matching to increase the power transferred from the antenna through the receiver to the earphone E1. This type of circuit was used in higher quality radios around 1920. Maximum power is transferred from one circuit to another when their impedance (resistance) is equal.