United States or Saint Helena, Ascension, and Tristan da Cunha ? Vote for the TOP Country of the Week !
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. It may be that listening to this signal will give us clues that our eyes miss when we examine the tracings." Winston added, "That's your job. I intended to keep you here together, a half day at a time.
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.
Furthermore, Lew informed him, Henry had been talking to the wireless men at the Frankfort station, and not only were they willing to work with him to protect the forest, but they were also sending an amplifier to Oakdale so that Charley would be sure to get their messages with the greatest distinctness.
To use a loud speaker you should have a vacuum tube detector receiving set and this must be provided with a one-step amplifier at least. To get really good results you need a two-step amplifier and then energize the plate of the second vacuum tube amplifier with a 100 volt B battery; or if you have a three-step amplifier then use the high voltage on the plate of the third amplifier tube.
Connect the first post of the variable condenser to the + or positive electrode of the A battery and its or negative electrode with the rotating contact arm of the rheostat. Next connect one end of the resistance coil of the rheostat to one of the posts of the amplifier tube that leads to the filament and the other filament post to the + or positive electrode of the A battery.
From this lead tap off a wire and connect it to the free terminal of the filament of the first amplifier tube, and finally connect the end of the lead with the free terminal of the filament of the second amplifier tube.
Since the diagram shows only one amplifier and one radio frequency transformer, it is consequently a one step amplifier; however, two, three or more, amplifying tubes can be connected up by means of an equal number of radio frequency transformers when you will get wonderful results.
The way the positive and negative voltages of the oscillations which are set up by the incoming waves, energize the grid; how the oscillator tube clips off the negative parts of them, and, finally, how these carry the battery current through the tube are shown graphically by the curves at D. How the Vacuum Tube Acts as an Amplifier.
When listening-in to distant stations the energy of the received wireless waves is often so very feeble that in order to hear distinctly an amplifier must be used.
This latter relay action will be explained when we come to its operation as an amplifier. We have just learned that when the stream of electrons flow from the hot wire to the cold positive plate in the tube they form a conducting path through which the battery current can flow. This is the reason the vacuum tube amplifies as well as detects. How the Three Electrode Tube Acts as a Detector.
Word Of The Day