August 1965 Popular Electronics
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
It's Friday and therefore
time for a pop quiz (does that line give you a fearsome flashback to your school
days?). Whenever I have one available, I like to post quizzes from vintage
electronics magazines, like this one on diode circuit functions. Many of them have
vacuum tubes, but this one has the solid state symbols so the under-40 folks won't be
uncomfortable. Your job is to look at the diode circuits and match them with the
names of the functions. A couple of them will probably cause some head scratching,
but you should do well. Don't jump to a quick conclusion with circuit "E" without
noticing the two signal generators attached to it.
If you like diode quizzes,
here is another from the July 1961 issue of Popular Electronics.
Diode Function Quiz
By Robert P. Balin
The versatile semiconductor diode serves in many different ways in electronic
circuits. See if you can match the diode functions (1-10) listed below with the commonly
used circuits (A-J) illustrated.
1) Clamper Detector Gate ___
2) Detector ___
3) Gate ___
4) Limiter ___
5) Modulator ___
6) Noise Generator ___
7) Oscillator ___
8) Overload Protection ___
9) Regulation ___
10) Scale Expander ___
Popular Electronics published many quizzes over the years
- some really simple and others not so simple. Robert Balin created many of the quizzes.
This is a listing of all I have posted thus far.
- Bridge Circuit
Quiz -December 1966
- Diode Function
Quiz - August 1965
- Diagram Quiz, August
- TV Trouble Quiz,
- Electronics History Quiz,
- Scope-Trace Quiz,
Circuit Analogy Quiz, April 1973
Your Knowledge of Semiconductors, August 1972
- Ganged Switching
Quiz, April 1972
- Lamp Brightness
Quiz, January 1969
- Lissajous Pattern Quiz, September 1963
Quizoo, October 1962
- Electronic Photo Album Quiz, March 1963
- Electronic Alphabet Quiz, May 1963
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960
- Vector-Circuit Matching Quiz, June 1970
Quiz, September 1961
- RC Circuit
Quiz, June 1963
- Diode Quiz,
- Electronic Curves Quiz, February 1963
- Electronic Numbers Quiz, December 1962
- Energy Conversion Quiz, April 1963
Function Quiz, June 1962
Geometry Quiz, January 1965
Factor Quiz, November 1966
Math Quiz, November 1965
- Series Circuit Quiz,
Electrochemistry Quiz, March 1966
- Electronic Analogy
Quiz, November 1961
Coupling Quiz, August 1973
- Electronics Analogy Quiz, August 1960
- Audio Quiz,
Unit Quiz, May 1962
Capacitor Circuit Quiz, June 1968
- Quiz on AC Circuit Theory, December 1970
- Magnetic Phenomena Quiz, February 1962
- Electronics Geography Quiz, April 1970
Electronic Menu Quiz, August 1963
- Electronic Noise Quiz, August 1962
- Electronic Current Quiz, October 1963
- Electronic Inventors Quiz, November 1963
Function Quiz, January 1962
- Electronic Measurement Quiz, January 1963
Tube Quiz, February 1961
- Kool-Keeping Kwiz, June
Diode Function Quiz Answers
1 - H In a positive clamping circuit, diode conduction during the negative
half cycle permits the capacitor to charge up to a voltage nearly equal to the peak value
of the input signal, but the output is zero. On the positive half cycle, the diode stops
conducting. The voltage across the capacitor adds to the signal voltage and the output
is approximately twice the peak voltage.
2 - C A diode detector passes only one-half of the input signal's
waveform to recover the audio portion of the signal.
3 - F In an "And" or "Coincidence" gate, used in logic circuits,
two simultaneous input signals of proper polarity and sufficient amplitude to overcome
the forward bias of both diodes are required to produce an output signal.
4 - I In limiter circuits, a single reverse-biased diode can be
used to clip one side of the waveform at a preselected voltage level.
5 - E In a double-sideband modulator, the carrier is suppressed
while upper and lower sidebands are developed.
6 - A A small current passed through a silicon crystal diode in
the reverse direction creates a noise or hiss, which can be used to test a radio receiver
and other equipment.
7 - G In a Zener diode relaxation oscillator, a charging capacitor
increases the reverse voltage across the diode until its Zener breakdown point is reached.
The capacitor then discharges through the diode. When the diode stops conducting, the
charging cycle repeats itself.
8 - D A reverse-biased Zener diode is often connected in parallel
with a meter to provide overload protection. When the preselected diode breakdown voltage
is exceeded, the diode acts as a shunt.
9 - B Two Zener diodes connected back-to-back are used to regulate
an a.c. supply voltage by alternately clipping the voltage peaks at a preselected level.
10 - J In a depressed-zero meter, a reverse-connected zener diode in
series with the meter prevents any indication until the breakdown voltage is reached.
Input voltages ranging from the diode's breakdown point to the meter's limit can then
be spread to fill the entire scale, from one end to the other.
Posted May 25, 2018