First Book of Radio and Electronics

First Book of Radio and Electronics - Alfred Morgan

Reading time: 2 minute

Author: Alfred Morgan
Published by Charles Scribner's Sons, New York
Library of Congress Cataloging in Publication Data
Printed in the United States of America
Year of publication: 1977

Did you know that ...? Is the human ear sensitive to air vibrations with frequencies between 20 Hz and 20 kHz, with a maximum auditory sensitivity around 3500 Hz? This interval depends a lot on the amplitude of the vibration and on the age and state of health of the individual. Thus, sound can be defined as the sensation produced in the ear by vibrations or as the energy produced by vibrations or changes in pressure.

What does the book present?

How does a phone work? Who invented the radio and how are its signals sent? If you want to know about all these things and much more, here is a necessary book for basic knowledge, with a less technical content, helping a lot to unravel some 'mysteries'.

There are also detailed plans for many projects - including simple radio receivers, microphones, amplifiers and information on how to send and receive telegraphic radio signals.

All projects can be designed in your own workshop and are presented in a clear, interesting way, which arouses the curiosity of the young scientist.

First published in 1954 and now available in an updated version, the "First Book of Radio and Electronics" or translated edition, "Mr. Morgan's First Book of Radio and Electronics" is a classic in its field.

The structure of the book

  1. The First Wireless Telegraph and the First Wireless Telephone
  2. A Few Facts About Electricity
  3. About Radio Waves
  4. Electrons and Electronics
  5. Radio Tubes-Feedback and Regeneration
  6. Things You Should Know About the Parts and Materials Used to Build Radio and Electronics Apparatus
  7. Crystal Detectors
  8. Simple, Practical Radio Receivers and How to Build Them
  9. How to Build a One - Tube Regenerative Receiver
  10. You Can Build an Amplifier
  11. The Antenna and Ground for Your Homemade Radio Receiver - How to Solder
  12. Learning to Send and Receive Radio Telegraph Signals

sources:

https://ro.wikipedia.org/

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6 comments

  1. Very correct and clearly specified. Congratulations! I would also add here… The minimum energy for detecting sound through the human auditory apparatus is max: - 2… 5 nW; - 2… 5 nano wati; - 2… 5 x 10 minus 9 watts.

  2. Did you know that there is a radio transmitter on the frequency of 10khz that the human ear does not hear? What power should it have to be heard?

  3. Yes, let's have fun, an Olympics physics problem, knowing that the human ear can differentiate two sounds if there is 1/10 of a second between them, to calculate what is the minimum distance between man and an obstacle to notice the effect of echo? There are no other data, ie the rest are known. We try?

  4. Who hears 20kHz? The statistical average is somewhere at 14-16 kHz. It depends a lot on personal hygiene. Helmholtz, a representative of the human species, heard 30kHz, tested in the laboratory. There will be others, untested ..

  5. On topic: I knew that the maximum sensitivity of the human ear is around the frequency of 1.000 Hz, for intelligible speech the audio bandwidth is deliberately limited to 300 - 3.000 Hz in voice communications equipment! So: which 3.500 Hz? See also: physiological volume correction (aka loudness); physiological characteristic amplitude-frequency of the human ear, notions of acoustics, audiogram….

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