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Updated: May 1, 2025
Where either a radio frequency transformer, that is one without the iron core, or an audio frequency transformer, that is one with the iron core, is used to couple the amplifier tube circuits together better results are obtained than where a high resistance grid leak is used, but the amplifying tubes have to be more carefully shielded from each other or they will react and set up a howling noise in the head phones.
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.
But the furniture was new and attractive; these were not the rooms of a poor man. An elaborate audio system took up one entire wall; elsewhere, Alan saw books of all kinds, tapes, a tiny mounted globe of light-sculpture within whose crystal interior abstract colors flowed kaleidoscopically, a handsome robot bar.
Trigger touched the blue circle. "Go ahead," she invited. "Thank you, Miss Drellgannoth," said the voice. "For the duration of the voyage your personal ComWeb will be opened to callers, for either audio or visual intrusion, only by your verbal permission or by your touch on the blue circle." It stopped. Another voice picked up. "This is your Personal Room Stewardess, Miss Drellgannoth.
"O.K., it's all set. Let's get out of here!" The two cadets raced back to the jet boat and blasted off immediately. Once in space, Astro turned to Roger. "Better check in with Major Connel before he tears himself to pieces!" "Yeah," agreed Roger. "I guess you're right." He flipped on the audio communicator. "Attention! Attention! Manning to Major Connel. Am making flight back to Polaris.
It was the 1939 edition and I found a circuit for a receiver which looked simple enough for me to try. It was described as a regenerative detector and audio amplifier. One was the Electron run by George Spanos, who was the agent for the Dutch Philips company.
To receive wireless telegraph signals, however, from a transmitter that uses an arc or a vacuum tube oscillator and which sends out continuous waves, either the transmitter or the receptor must be so constructed that the continuous waves will be broken up into groups of audio frequency and this is done in several different ways. The heterodyne method will be described in this chapter.
The use of amateur regenerative cascade audio frequency receiving sets is getting to be quite common. To get the greatest amplification possible with amplifying tubes you have to keep a negative potential on the grids.
In order to secure the reproduction of the higher audio frequencies, it was found necessary to run the tape at a rate of 90 metres per minute past the recording and reproducing heads. This meant that the length of tape required for a half-hour's programme was nearly 3 kilometres! Brief description of the ribbon or velocity microphone.
To test range, life, and general performance of audio communications transmitter, type X21. To test the above-mentioned transmitter under conditions of deep space flight. This test to take place on the planet Tara, Alpha Centauri. This communication and all subsequent information relative to above-mentioned mission shall be classified as topmost secret. Signed: WALTERS, Commandant, Space Academy
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