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The opening line of this Transistor
Terminology Puzzle states it is the tenth anniversary of the invention of the transistor,
but that is because the crossword appeared in a 1958 issue of Radio & TV
News magazine. It was just before Christmas of 1947 that
Drs. John Bardeen, Walter H. Brattain and William Shockley announced their discovery
from Bell Laboratories. Note that 1947 is eleven years earlier, not ten. However,
the theme of this crossword seems to reference the bipolar junction transistor (BJT),
which was developed in 1948 - hence the 10th anniversary claim. The first transistor
was a point contact type. Print out the page and have a go at it.
Transistor Terminology Puzzle
By John A. Comstock
This year marks the tenth anniversary of the development of the transistor by
three Bell Telephone Laboratories' scientists. Have you kept up with this revolutionary
component? Test your knowledge.
Across
1. Semiconductor which is neither "p" nor "n," containing roughly an equal
number of electrons and holes.
5. Current carriers in a semiconductor which are positively charged.
8. Parameter letters symbol representing a transistor's power output.
9. Maximum inverse voltage rating which a transistor can withstand without
breakdown.
10. Collector cut-off current.
12. Semiconductor material found most often in rectifiers.
15. Symbol for transistor operating temperature.
16. D.C. collector current.
18. Transistor input impedance.
19. Forward current ratio (input a.c. open-circuited) .
20. Junction of "n" and "p" areas in a semiconductor.
22. Metal button alloyed into base wafer of an alloy-type transistor.
23. A number of these particles carry current, specifically electrons and
holes.
25. Parameter letters symbol for transistor output impedance.
27. One of the electrodes of a field-effect transistor.
31. Current carriers of a negative polarity.
32. Letters symbol for d.c. supply voltage base-to-emitter.
Down
1. Small addition to semiconductor, usually a donor or an acceptor.
2. Imperfections in a crystal which snare current carriers.
3. A transistorized preamp should generate minimum _____________.
4. Parameter symbol for emitter cut-off current.
5. Four-layer transistor with built-in amplifier for a collector.
6. That portion of cut-off current caused by surface effects.
7. Semiconductor commonly used in transistors and crystal diodes.
11. Location of transistor barrier.
13. Electrode of a transistor corresponding to vacuum tube's cathode.
14. Intrinsic region-type transistor with "n"-type emitter and collector
and "p"-type base (Abbr.).
17. Runaway condition in which transistor's heat dissipation increases
with higher temperature at such a rate that temperature keeps rising.
21. Parameter symbol for common emitter power gain.
24. Small current flowing opposite to normal in a diode when an opposing
potential is applied.
25. Reverse voltage at which a large current begins to flow, caused by
crystal breakdown.
26. Impurity used intentionally to produce an "n"-type semiconductor.
28. One of the electrodes of a transistor.
29. Letters symbol for emitter-to-base d.c. voltage.
30. Letters symbol used to represent common base output admittance (input
a.c. open-circuited).
32. Symbol for transistor's junction temperature.
(Solution at bottom)
Here are other electronics-themed crossword puzzles from vintage electronics
magazines (RF Cafe
Crosswords here):
Answer to Puzzle
Posted November 7, 2019
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