A current of audio frequency that is amplified by an amplifier tube or other means.
A Six Step Amplifier Receiving Set With a Loop Aerial.
There is a vacuum tube amplifier [Footnote: This is the radiation UV-201, made by the Radio Corporation of America, Woolworth Bldg.
With Vacuum Tube Detector and Two Step Amplifier Tubes.
Wiring Diagram for Using One A or Storage Battery with an Amplifier and a Detector Tube (A) Fig.
The Telemegafone itself is not an amplifier in the true sense inasmuch as it contains no elements which will locally increase the incoming current.
A scheme that uses a third circuit to feed back part of the oscillations through a vacuum tube and which increases its sensitiveness when used as a detector and multiplies its action as an amplifier and an oscillator.
Loor continued to blink while Sy reduced the amplifier to jumbled scrap, and then the old man found his voice again.
He showed Arna the delicate telepathic amplifier which carried his mental transmissions across the dust-voids of space, to be received by the unaided mind of a youthful Unique.
You've got a pad on your tail," the kid said, again as low as his amplifier would permit.
He tested the Marspeaker--an amplifier and speaker in another pouch, designed to raise the volume of his voice to a level where it would carry through even the air of Mars.
It was very faint, but I had the amplifier turned down low.
He turned the extra amplifier to maximum output, to increase the effectiveness of the noise, and turned on the apparatus.
He trailed the submarine ear overboard and set the recorder to work as an amplifier only.
Then he began to assemble an audio amplifier to build up the volume of the sounds already taped for re-use under the sea.
It is only when the amplifier of the wireless magnifies the sounds that we realize how many of them our ears fail to hear.
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.
The battery would be forwarded as soon as it reached the Wireless Club and had been inspected, and the amplifier would go with it.
He took down the aerial, threw away the spreaders, uncoupled the amplifierwhich he needed for use himself, and replaced the little outfit in the pasteboard box.
Charley took advantage of the remaining daylight to couple up the battery and the amplifier to his wireless.
Her father had telegraphed for the material to build the super-regenerative and amplifier circuit, and the material came by express the morning after the picnic on which Henrietta had disgraced herself.
The amplifier worked all right that evening, and Jessie was very glad.
They had brought the two-step amplifier and proposed to use that for most of their listening in, rather than the headphones.
The two-step amplifier Mr. Norwood had formerly bought did not always work well, especially, for some unknown reason, since they had come to the seashore.
I might get a chance to work out my amplifier then, as I used to think I would, some day.
Then—who knows—I might in time go Lee De Forest one better, and have my amplifier knock his old-fashioned electrolytic out of business, for good.
He walked to the amplifier and bent, fumbling with the door latch.
We've about concluded that somehow our amplifier system is modulating the incoming hydrogen signal from the antenna.
Farid has set up an amplifier on the output circuit, in parallel with the normal system, and he has brought in a pair of tape recorders we borrowed from the government radio station.
Rick hunted until he found a space under an amplifier that was big enough for the two extra kittens.
In the final amplifier stage Harry used a Telefunken pentode, the famous and very efficient RL12P35 which was used in the German tank transmitters in all stages, oscillator, P.
He adopted the same method of modulation using a record player amplifier and an Astatic crystal microphone.
And equally obviously, without his amplifier jewels, he'd be little stronger psionically than one of Dar Girdek's drivers.
The control and amplifierjewels he wore had lost their inner fire--were merely dull, lifeless reflectors of the sunlight.
The resulting signal was fed to an amplifier stage.
A blast of hatred that drove through theamplifier and into his skull.
They listened in on the radio that evening until late, using the amplifier and horn that Mr. Norwood had bought.
With an amplifier the concerts broadcasted from several stations can be heard inside the tent, and we will charge admission to the tent.
Mr. Norwood brought out from the city a two-step amplifier and a horn and they were attached to the instrument.
And an amplifier of this kind is not scratchy one bit.
But, of course, father is getting a set with phones, not with an amplifier like that one out at Parkville," Jessie explained to her chum.
You see, Henry, this tube is just about 400 times as much of an amplifier as the other tubes, and we get a detector and amplifier all in one.
Those things like little electric lights are the tubes and they're the heart of the whole thing, and I've a one-step amplifier and that has to have another tube.
Wires were run from the amplifier through the rear-seat windows, which were opened just enough to take the thin cables.
Rick supervised the placement of the amplifierin the rear seat.
Slipping a hand inside his blouse, Corba produced the tiny amplifierand earphone.
Small and easily concealed as a man's wrist watch, the device was a powerful amplifier of ordinary sounds.
The output was amplified by a two-stage audion amplifier and supplied through a coupling coil to the large antenna of the U.
If you take the precautions which I have mentioned your radio receiving set formed by a detector and one amplifier will look like that of Fig.
You can use any detector circuit which you wish,[10] one with a grid condenser and leak, or one arranged for feed-back In either case your amplifier may well be as shown in the figure.
Illustration: Fig 127] In the case of a multi-stage amplifier of audio-frequency current there is always the possibility of the amplification of any small variations in current which may naturally occur in the action of the batteries.
Illustration: Fig 116] The next step is to use the audion as an amplifier of the radio-signal before its detection.
We say that the tube acts as an "amplifier of voltage" because we can get a larger effect than the number of volts which we apply would ordinarily entitle us to.
If a multi-stage amplifier is to be built for a current which does not have too high a frequency the "capacity effects" and the other difficulties due to high-frequency need not be seriously troublesome.
You remember that when the audion is operated as an amplifier the resistance to which it supplies current is made equal to its own internal resistance of R{p}.
When we use an audion as an amplifier of an alternating current we send the current which is to be amplified through the primary of a transformer, as in Fig.
An efficient multi-stage amplifier for radio-frequencies is difficult to build because of what we call "capacity effects.
Impulsively he halted again and listened, his amplifier turned up.
Dworn halted and listened intently, his amplifier turned all the way up.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "amplifier" in a variety of sentences. We hope that you will now be able to make sentences using this word.
