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These phones are wound to resistances of from 75 ohms to 8,000 ohms, and cost from $1.25 for a receiver without a cord or headband to $15.00 for a pair of phones with a cord and head band.
Such resistance represents a length of eighteen miles of ordinary telegraph wire. After this, 700 ohms were overcome with 3.4 volts. This result was obtained by direct transmission, and without an induction coil, and it is probable that it might be much exceeded without sensibly increasing the electromotive force of the current. Le Genie Civil.
A good lightning conductor should not have a higher electrical resistance than 10 ohms from the point to the ground, including the "earth" contact. Exceptionally good conductors have only about 5 ohms.
This consists of: the grid leak; the chopper; the choke coil, and the key. The grid leak is connected in the lead from the grid to the aerial to keep the voltage on the grid at the right potential. It has a resistance of 5000 ohms with a mid-tap at 2500 ohms as shown at C. It costs $2.00. The chopper is simply a rotary interrupter driven by a small motor.
This coil usually has a resistance of about 75 ohms and the meaning of the ohmic resistance of a receiver and its bearing on the sensitiveness of it will be explained a little farther along. How a Wireless Headphone Is Made. For wireless work a receiver of the watch-case type is used and nearly always two such receivers are connected with a headband.
So it has to force its way through whillions and skillions of ohms of resistance, so only the most powerful stimuli 'maximum signal' in your jargon, perhaps? can get through to you at all." Suddenly she giggled like a schoolgirl. "You're either psychic or the biggest wolf in the known universe, and I know you aren't a wolf.
The little group in the machine shop was soon deep in the discussion of ohms, amperes, volts and currents, and, for a time, Tom almost forgot the message calling him to Philadelphia. Taking advantage of the momentary lull in the activities of the young inventor, I will tell my readers something about him, so that those who have no previous introduction to him may feel that he is a friend.
"You see, they weren't designed to indicate such distances on such small objects as men, so I threw a million ohms in series with the impulse. That cuts down the free rotation to less than half an hour, and increases the sensitivity to the limit. There, isn't she trying to quit it?" "Yes, it is settling down. It must be on him still." Finally the ultra-sensitive needle came to rest.
Had you recognized that she was a woman with as good a right as you to know the truth concerning all matters in this world which she has to make her way through, you would have answered her question, and then I suppose I should have gone away without having exchanged a word with her on any more personal matters than induction coils and ohms of resistance; and in all probability you would have been spared the necessity of having me for a brother-in-law."
These phones are wound to resistances of from 75 ohms to 8,000 ohms, and cost from $1.25 for a receiver without a cord or headband to $15.00 for a pair of phones with a cord and head band.
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