Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 17, 2025
With a tuner, which can be tuned to bring you into the same key with the station you are listening to; a detector to catch the signal after the persons talking have been brought into tune; and an amplifier that intensifies or increases the sound you have your receiving outfit.
Where radio frequency or audio frequency amplifiers are used to couple your amplifier tubes in cascade you must take particular pains to shield them from one another in order to prevent the feed back of the currents through them, which makes the head phones or loud speaker howl.
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.
It seated on a plastic seal, and the little air compressor at his back began to hum, ready to turn the thin wisp of Mars' atmosphere into a barely breathable pressure. 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.
Rick hunted until he found a space under an amplifier that was big enough for the two extra kittens. The space was covered by an access door. The kittens would be safe there. It would be no real loss if they were stolen, anyway. Later, the boys helped check circuits while the radio telescope swung through a variety of arcs, with Farid at the controls.
In this way then are the faint incoming signals, speech and music which are received by the amplifying receiving set reproduced and magnified enormously. The Telemegafone is shown complete at B. From the foregoing chapters you have seen that the vacuum tube can be used either as a detector or an amplifier or as a generator of electric oscillations, as in the case of the heterodyne receiving set.
A little later they stood entranced in the Convention Hall before a new, beautifully modeled radio amplifier, so massive that the volume of music it poured forth actually seemed to cause vibration in the walls of the great room in which they stood. One of the most interesting features was the radio-controlled automobile.
Seaton crouched over the amplifier, his jaw set and every muscle taut, his eyes leaping from one meter to another, his right hand slowly turning up the potentiometer which was driving more and ever more of the searing, torturing output of his super-power tube into that stubborn brain.
The man's weight was a stiff load, even on Mars; but, somehow, he couldn't leave his body with the old couple. He stopped finally ten blocks of narrow alleys away, and put Murdoch down. Now he had no witnesses, except Sheila Corey. He had no book, no clues as to whom to see and what to do. He heard the sound of a mobile amplifier, and strained his ears toward it.
Together they switched on the current, regulated amplifier, detector, and tuner, and each with a head receiver tight to his ears sat down. "Whee, but it is thick, to-day!" shouted Dick. "Run the tune up, kid, and see if we get anything." "It is always bad a day like this," called Walter. "Besides, everybody seems to be butting in in the morning. Infernal, isn't it?"
Word Of The Day
Others Looking