Two modem options, Hamcomm and Hamcomm+. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two modem options, Hamcomm and Hamcomm+. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Data transfer

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Two modem options, Hamcomm and Hamcomm+

Chip: LM741
Electrolyte: 10mf x 63v
Capacitors: 3 x 100nf, 1 x 220nf
Diodes: 5 x 1N4148
Transistor: 2N2222
Resistors: 2 x 100k, 1 x 22k, 1 x 3k, 3 x 1k

Publication: krasnodar.online.ru/hamradio

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Random news from the Archive

Our era was given a new name 22.07.2018

Geologists from the International Commission on Stratigraphy gave the official name of our era - Meghalai. This period includes the last 4200 years of the development of the planet Earth.

The beginning of the Meghalaya era is a megadrought that destroyed several civilizations in Egypt, Greece, Syria, Palestine, Mesopotamia, China and other ancient states. The drought was provoked by the movement of the waters of the World Ocean and atmospheric air circulation.

Scientists have identified two more periods in the history of the planet - Northgrippium and Greenland. The Northgrippia phase began 8300 years before Meghalaya and is characterized by a sharp decrease in the temperature of the earth's surface due to the melting of glaciers. Because of this, the volume of fresh water has increased and ocean currents have been disrupted.

The Greenlandic era began 11 years ago, just after the Ice Age. All three eras are included in the Holocene epoch, which began in 700 BC. e. and is still going on.

The decision to single out new eras is not supported by all scientists. Mark Maslin, professor of geography at the University of London, doubts that climate change, chosen as the boundaries of new eras, is really important. Also, Maslin and his colleagues believe that the names of time boundaries should have reflected the influence of people on the planet.

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