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Updated: May 3, 2025
Shunt the potentiometer around the A battery and connect the sliding contact with the or zinc pole of the B battery and the + or carbon pole with one terminal of the headphone; connect the other terminal to one of the posts of the variometer and the other post of the variometer to the plate of the detector. Finally shunt a .001 mfd. fixed condenser around the headphones.
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.
George Prince had said that he would make opportunity to disconnect the room's insulation. He had evidently done so. I picked up the interior sounds at once; my headphone vibrated with them. And with trembling fingers on the little dial between my knees as I crouched in the darkness behind the cylinder case, I synchronized. "Johnson is a fool." It was Miko's voice. "We must have the passwords."
I used about 15 plates and to this day I have no idea what the capacity of the finished capacitor was. Some small items for the receiver could be found in a little shop owned by an old man who charged exorbitant prices, so I decided I must go to Moscow for the valve and a single headphone that I needed. "But Moscow was three days and two nights away by train, and it was the middle of winter.
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.
In the better makes of microphone transformer, there is a third winding, called a side tone coil, to which a headphone can be connected so that the operator who is speaking into the microphone can listen-in and so learn if his transmitter is working up to standard. The Magnetic Modulator.
Particularly a decent pair of headphones; I had to hold the army headphone to me ear with one hand which gave me pins and needles. For some years I had kept goldfish and pigeons, so I sold them. A friend of mine had gone to sea as a cadet and his ship went abroad, so I asked him to get me a pair of headphones.
He also bought a dry battery pack which gave 80 volts, and an enormous single headphone for one ear which was ex-army surplus. When he returned home and began to build his receiver he raided his mother's kitchen to build things like terminals, switches etc.
Shunt the potentiometer around the A battery and connect the sliding contact with the or zinc pole of the B battery and the + or carbon pole with one terminal of the headphone; connect the other terminal to one of the posts of the variometer and the other post of the variometer to the plate of the detector. Finally shunt a .001 mfd. fixed condenser around the headphones.
A further difference between them is that the wireless headphone is made as sensitive as possible so that it will respond to very feeble currents, while the ordinary telephone receiver is far from being sensitive and will respond only to comparatively large currents. How a Bell Telephone Receiver Is Made.
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