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An important principle used in crystal radio design to transfer maximum power to the earphone is impedance matching. [53] [73] The maximum power is transferred from one part of a circuit to another when the impedance of one circuit is the complex conjugate of that of the other; this implies that the two circuits should have equal resistance.
A crystal set receiver consisting of an antenna, a variable inductor, a cat's whisker, and a filter capacitor. A crystal receiver is very simple and can be easy to make or even improvise, for example, the foxhole radio. However, the crystal radio needs a strong RF signal and a long antenna to operate.
English: Circuit of the simplest possible crystal radio receiver. Circuits of this type were used in the first experimental crystal radio receivers in the pioneering days of radio, just after 1900. It consists of a crystal detector (semiconductor diode) DI connected between a long wire antenna and ground, with a sensitive earphone E1 attached ...
Different types of antennas are made with properties especially optimized for particular uses, and the electrical design of antennas serves as a way to group them: Most often, the greatest design constraint is the size of the radio waves the antenna is to intercept or emit.
These weren't very efficient rectifiers in crystal radios, because the low voltage signal from the antenna had to overcome the device's forward voltage drop, and so was insufficient to drive the device far into its conduction region, so it had a large AC resistance.
Instead of a single tuning coil, it has an antenna coupling transformer (L1,L2) which improves the poor selectivity found in most crystal receivers. Each coil functions as a tuned circuit; the primary L1 resonating with the capacitance of the antenna and the primary tuning capacitor C1 and the secondary resonating with the secondary tuning ...
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.
The crystal radio receiver is the simplest kind of radio receiver or tuner, and was the basis for the first commercially successful type of radio product design. Inexpensive and reliable, it was sold in millions of units and became popular in kits used by hobbyists, and was a major factor in the popularity of radio broadcasting around 1920.
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