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Updated: May 17, 2025
But a wireless instrument, on the contrary is spared nothing, having attached to it a detector that catches every sound and an amplifier that magnifies it and makes it discernible to our ears. When you listen in on a wireless telephone you will be uncontestably conscious of this.
This is an induction coil that is designed especially for wireless telephone modulation. The Magnetic Modulator. This piece of apparatus is also called a magnetic amplifier. The iron core is formed of very thin plates, or laminations as they are called, and this permits high-frequency oscillations to surge in a coil wound on it.
A better amplifying receiving set can be made than the one just described by using a vacuum tube detector instead of the crystal detector. A Radio Frequency Transformer Amplifying Receiving Set. In this set, which gives better results than where a grid leak is used, the amplifier tube is placed in the first oscillation circuit and the detector tube in the second circuit.
Where two or more amplifier tubes are coupled together in this way the scheme is known as cascade amplification.
With this six step amplifier set and loop aerial you can receive wave lengths of 150 to 600 meters from various high power stations which are at considerable distances away. Efficient Regenerative Receiving Set. How to Prevent Howling.
Connect the lead that runs from the second post of variable condenser to the first post of the third rheostat, the second post of which is connected with one terminal of the second amplifying tube; then connect the first post of the rheostat with one end of the secondary coil of the second audio frequency transformer and the other end of this coil with the grid of the second amplifier tube.
World's Largest Loud Speaker ever made. Either kind may be used with a one- or two-step amplifier or with a cascade of half a dozen amplifiers, according to the degree of loudness desired. The Telemegafone itself is not an amplifier in the true sense inasmuch as it contains no elements which will locally increase the incoming current.
Now, the situation of Charlemagne, successor to a throne already firmly established, and in his own person a mighty amplifier of its glories, and a leader in whom the Franks had unlimited confidence, threw into his hands an unexampled power of modifying the popular restraints upon himself in any degree he might desire. 'Nunquam libertas gratior exit, Quam sub rege pio' is the general doctrine.
The reason a vacuum tube detector is more sensitive than a crystal detector is because while the latter merely rectifies the oscillating current that surges in the receiving circuits, the former acts as an amplifier at the same time.
To use the amplified radio frequency oscillating currents or amplified audio frequency alternating currents that are set up by an amplifier tube either a high resistance, called a grid leak, or an amplifying transformer, with or without an iron core, must be connected with the plate circuit of the first amplifier tube and the grid circuit of the next amplifier tube or detector tube, or with the wire point of a crystal detector.
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