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Amplifier Quiz - Part 2
March 1964 Popular Electronics

March 1964 Popular Electronics

March 1964 Popular Electronics Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

Part 1 of Robert Balin's "Amplifier Quiz" appeared in the February 1964 issue of Popular Electronics magazine, and this Part 2 came the following month. Part 1 had vacuum tubes, but these use transistors. Says Mr. Balin, "Young Squirts with ink still damp on their diplomas get a break here, as transistors came in after the oldsters left school." I admitted in Part 1 that I was stumped by two of the circuits. This time I did no better - 4 out of 6 again. That's a score of only 67% - a "C." Surely, you will fare better than I. Maybe that means an "old timer," has no advantage either way (tube or transistor) over a "Young Squirt." Part 1 | 2

Amplifier Quiz - Part 2

Amplifier Quiz (A) - March 1964 Popular Electronics - RF Cafe

Amplifier Quiz (B) - March 1964 Popular Electronics

Amplifier Quiz (C) - March 1964 Popular Electronics

Amplifier Quiz (D) - March 1964 Popular Electronics

Amplifier Quiz (E) - March 1964 Popular Electronics

Amplifier Quiz (F) - March 1964 Popular Electronics

By Robert P. Balin 

Old-timers had a slight edge in the tube amplifier quiz last month. The Young Squirts with ink still damp on their diplomas get a break here, as transistors came in after the oldsters left school. Try to match the circuits (A-F) with the names (1-6) widely (but not universally) given them in electronics handbooks. Four right without cracking a book is par; five without guessing is excellent. Next month's brain busters will deal with metals used in electronics.

 

1  Compound-connected amplifier ___

2  Reflex amplifier ___

3  Bridge amplifier ___

4  Push-pull amplifier ___

5  Complementary symmetry
        amplifier ___

6  Paraphase amplifier ___

 

Answers below.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

 

Quiz Answers

1 - D  In the COMPOUND-CONNECTED amplifier, over-all current gain remains relatively constant in spite of changes of emitter current with signal voltage.

2 - C  In the REFLEX AMPLIFIER, the r.f. amplifier stage preceding the diode detector is also made to amplify the audio signal output of the diode and drive a following audio stage via the iron-core transformer.

3 - F  The BRIDGE AMPLIFIER is driven by two input signals of opposite phase (or one signal balanced to ground) and due to the bridge configuration does not cause any d.c. to flow through the loudspeaker voice coil.

4 - B  The PUSH-PULL amplifier is symmetrical, and has less even-harmonic distortion than a single-ended amplifier of equal power.

5 A  In a COMPLEMENTARY SYMMETRY amplifier, pnp and npn transistors are connected so as to give a push-pull output when driven by a single input signal without phase inversion.

6 - E  A PARAPHASE AMPLIFIER is one that receives a single-ended input signal and develops two single-ended output signals of opposite polarity.

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Copyright: 1996 - 2025
Webmaster: Kirt Blattenberger,
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

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