Replacing the carbon microphone in the phone. Scheme, description

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Replacing the carbon microphone in the phone. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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Replacing the carbon microphone in the phone

Author: Alexander Filin; Publication: N. Bolshakov, rf.atnn.ru

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Random news from the Archive

Eclipse and the body 15.11.2000

Employees of the German Institute for Pet Ethology at the University of Stuttgart observed the behavior of some animals during a solar eclipse on August 11 last year.

Of the three horses kept in the open, one began to snort loudly with the beginning of darkening, run around the pasture, and, finally, tail between her legs and trembling all over, huddled under a tree. The horses of the Icelandic breed reacted outwardly very calmly: they stood in the twilight, lowering their heads and closing their eyes, as if dozing off. However, a pulse sensor mounted on the leg of one horse showed that, compared with the usual 30-40 beats per minute, at the time of total eclipse, the pulse increased to 100 beats per minute or more.

Until now, the pulse of this frequency in horses was noted only during the races. The geese became worried and raised the alarm, and the ducks, sitting quietly on the shore, rushed into the water and gathered in the middle of the pond, as if hiding from a predator. Employees of two English universities conducted observations on a group of students. During the eclipse, the activity of leukocytes increased by almost nine percent in students.

Experiments carried out after the eclipse showed that neither darkness nor temperature per se affects the activity of leukocytes. Perhaps psychological stress is acting, and for people who do not understand what an eclipse is and are not prepared for the disappearance of the Sun in broad daylight, this effect should be even greater.

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