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[1] [74] [75] However, in crystal sets, the impedance of the antenna-ground system (around 10–200 ohms [57]) is usually lower than the impedance of the receiver's tuned circuit (thousands of ohms at resonance), [76] and also varies depending on the quality of the ground attachment, length of the antenna, and the frequency to which the ...
Those used with early wireless radio had more turns of finer wire to increase sensitivity. Impedances of 1,000 to 2,000 ohms was common, which suited both crystal sets and triode receivers. Some very sensitive headphones, such as those manufactured by Brandes around 1919, were commonly used for early radio work.
A foxhole radio is a simple crystal sets radio receiver cobbled together from whatever parts one could make (which were very few indeed) or scrounged from junked equipment. Such a set typically used salvaged domestic wiring for an antenna, a double-edged safety-razor blade and pencil lead (or bent safety-pin) for a detector, and a tin can ...
There are two jack outputs, the second of which is optional and can be used to send the bass through a different amplifier. There is also a headphone output jack, but it's designed for now-obsolete 2000 ohm-impedance headphones. [17] Though advertised as a "transistorised" model, the spring reverb tank is valve-driven. [17]
Headphone outputs and line outputs are sometimes confused. Different make and model headphones have widely varying impedances, from as little as 20 Ω to a few hundred ohms; the lowest of these will have results similar to a speaker, while the highest may work acceptably if the line out impedance is low enough and the headphones are sensitive ...
Greenleaf Whittier Pickard (February 14, 1877 – January 8, 1956) was an American electrical engineer and inventor.. While not the earliest discoverer of the rectifying properties of contact between certain solid materials, he was largely responsible and most famous for the development of the crystal detector, the earliest type of diode detector. [1]