Discussion
Match each oscillator with its feedback element.
List I
A. Hartley
B. Colpitts
C. Armstrong
List II
P. Tapped inductor
Q. Capacitive divider
R. Coupled winding
Select the correct match.
Answer: D
The pairing is A-P, B-Q, C-R. All three are the same amplifier and tank with three ways of extracting a fraction of the tank's signal, which is why they share a frequency formula and differ only in how the fraction is set. Recognising a family as one circuit with one element varied is far more economical than learning three circuits.
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