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He spoke into a telephone transmitter and his words were clearly heard by all in the audience, by means of amplifiers. At the same time a part of the electrical current from the amplifier, representing the sentence he voiced, was stored in a "delay circuit," another recent invention of the laboratories.
Dunark's machine couldn't work against resistance if the subject wasn't willing to give up his thoughts he couldn't get them. This one can take them away by force. In fact, by increasing plate and grid voltages in the amplifier, I can pretty nearly burn out a man's brain.
This done connect the negative, that is, the zinc pole of the B battery to the positive electrode of the A battery and connect the positive, or carbon pole of the former with one end of the grid leak and connect the other end of this to the plate of the amplifier tube. A Grid Leak Amplifying Receiving Set With Vacuum Tube Detector.
It was a complete two-way installation, however, comprising a generator of practically sustained waves, a good control system to modulate the output, and a ground system for radiating a portion of the modulated energy as well as a receiver and a good amplifier. "Here is this chimney in the rock about which Tom spoke," Jack pointed out. "They have hooked up through this.
It is built on exactly the same lines as the experimental transmitter just described, but instead of using a 100 volt plate amplifier as a makeshift generator of oscillations it employs a vacuum tube made especially for setting up oscillations and instead of having a low plate voltage it is energized with 350 volts. The Apparatus You Need.
Now connect one end of the tickler coil with the detector plate and the other post to the fixed .001 mfd. condenser, then the other end of this to the positive or carbon pole of the B battery. Finally, shunt the head phones and the .001 mfd. fixed condenser and you are ready to try out conclusions. A Regenerative Audio Frequency Amplifier Receiving Set.
You know those vast tin amplifiers employed in big convention halls, or in out-door meetings, to carry the voice of the speaker to the remotest depths of the audience; Johnson is a vast tin amplifier of the voice of the mass.
Where a six step amplifier, that is, where six amplifying tubes are connected together, or in cascade, the first three are usually coupled up with radio frequency transformers and the last three with audio frequency transformers. A radio frequency transformer is shown at B and costs $6 to $7. An Audio Frequency Transformer Amplifying Receiving Set.
As Bud nodded, Tom went on, "So we simply step up the volume till the sub's own noise gets drowned out or 'wasted' in all the racket." This could be done, he concluded, with fairly simple amplifying equipment. Bud, Hank, and Arv were jubilant at the idea. "Nice going," Bud said. "How soon can we give it a try?" "Soon as I can rig up the amplifier," Tom promised.
They had to put on their oxygen masks as the deadly fumes of the methane ammonia atmosphere began to swirl around them. They were near the outer limits of the atmosphere screen's effectiveness. "I think he's going into that building up ahead, Astro," said Tom, his voice distorted to a low metallic hiss by the miniature amplifier in the face of the mask.
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