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About RF Cafe
1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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January 1965 Electronics WorldTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Electronics World was published from May 1959 through December 1971. See all Electronics World articles.
Robert P. Balin created many electronics-related quizzes for Popular Electronics. I have posted many of them here on RF Cafe, and will post more in the future. Most of the Popular Electronics quizzes were pretty easy for anyone who has been in the electronics realm for a few years. This quiz, by contrast, is a real head scratcher. I was only able to get two out of 10 answers correct. It would take someone who is a physics historian to even come close to acing it - or I'm really just lacking in knowledge. Good luck.
By Robert P. Balin
Many important discoveries and inventions in the field of electronics were made by men who worked together as a team, and current textbooks still include the names of the co-inventors (1-10) listed below, See how many of these teams you can match with the sketches (A-J) which illustrate the devices or theory which they helped to develop.
(See answers below)
2. Biot-Savart ____
3. Eccles-Jordan ____
4. Fermi-Dirac ____
5. Fletcher-Munson ____
6. Foster-Seeley ____
7. Geiger-Muller ____
8. Kennelly-Heaviside ____
9. Langmuir-Child ____
10. Loftin-White ____
1-D. The Barkhausen-Kurz oscillator circuit is a positive-grid u.h.f. oscillator by Lecher wires in the grid and plate circuits.
2-E. The Biot-Savart Law, or Ampere's Law, specifies
the direction and magnitude of the magnetic field at any point
the vicinity of a current-carrying conduelor.
3-J. The Eccles-Jordan trigger circuit, or flip-flop,
is a bistable multivibrator in which the conducting state of
each half is
changed only by the incoming pulses.
4-B. Fermi-Dirac statistics predict the availability of current carriers in the semiconductor materials used to make transistors.
55-I. Fletcher-Munson curves show the relationship
between the signal frequency and the sound intensity required
listener to hear a constant loudness.
6-G. The Foster-Seeley FM discriminator circuit converts
a frequency-modulated radio-frequency carrier into an
amplitude-modulated signal from which the audio is detected by a balanced diode circuit.
7-F. A Geiger-Muller tube detects nuclear radiation
when beta particles ionize the gas inside the tube to start
of electrons between the cathode case and highly positive anode.
8-C. The Kennelly-Heaviside layer is the original term
for the ionosphere, now known to consist of various layers,
height and degree of ionization determine their effect upon high-frequency radio transmission.
9-H. The Langmuir-Child Law, or Three-Halves
Power Law, describes the relationship between the applied voltage
the resulting current in a diode vacuum tube.
10-A. The Loftin-White amplifier circuit uses direct coupling between stages and can handle signal frequencies down to d.c.
Posted March 19, 2015