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Updated: June 1, 2025
Next shunt a potentiometer around the A battery and connect the third post, which connects with the sliding contact, to the negative or zinc pole of a B battery, then connect the positive or carbon pole of it to the negative or zinc pole of a second B battery and the positive or carbon pole of the latter with one end of the primary coil of the second audio frequency transformer and the other end of it to the plate of the first amplifying tube.
And we probably are only a few years away from a storage disk capable of holding all the print media of our planet. What about documents other than text? As of 2005, there are 391 computer-generated audio books and a few human-read audio books. Voice-activated requests will be possible, as a useful tool for visually impaired readers.
Shuddering, the great cruiser eased to the ground foot by foot, perfectly balanced on the fiery exhaust from her main tubes. Seconds later the giant shock absorbers crunched on the ramp and Tom closed the master switch cutting all power. He glanced at the astral chronometer over his head and then turned to speak into the audio log recorder.
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.
Trigger found its control switch on the bedstand and shut it off. At once a soft chiming sounded from the miniature ComWeb on the bedstand. Its screen filled with a pulsing glow, and there was a voice. "This is a recording, Miss Drellgannoth," the voice told her. "If Room Service may intrude with an audio message, please be so good as to touch the blue circle at the base of your ComWeb."
And the radar is too complicated to change over to audio communications. We haven't got enough time." Tom clenched his teeth. He had had the same idea about using the communications set on the scout to contact the Academy. Now there was nothing to do but hope Vidac wouldn't find the one they were building. He called into the intercom again.
The gas filled tube, however, can be used as an amplifier and either kind of tube can be used for either radio frequency or audio frequency amplification, though with the exhausted tube it is easier to obtain the right plate and filament voltages for good working. The Fixed Resistance Unit, or Grid Leak. Grid leaks are made in different ways but all of them have an enormously high resistance.
By using a receiving set having a three step radio frequency and a three step audio frequency, that is, a set in which there are coupled three amplifying tubes with radio frequency transformers and three amplifying tubes with audio frequency transformers as described under the caption A Radio Frequency Transformer Receiving Set, you can use a loop aerial in your room thus getting around the difficulties if such there be in erecting an out-door aerial.
Run this wire on over and connect it with the first post of the second rheostat, the second post of which is connected with one terminal of the filament of the first amplifying tube; then connect the first post of the rheostat with one end of the secondary coil of the first audio frequency transformer, and the other end of this coil with the grid of the first amplifier tube.
While he's talking I've got to have audio waves heterodyned both ways in the circuit, and they'll be able to hear any noise any of us make so all of us except Carfon want to keep absolutely quiet, no matter what happens or what we see. As soon as he's done I'll cut off the audio sending and say something to let you all know we're off the air. Got it?"
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