Discussion
Which of the following is not a sinusoidal oscillator?
Astable multivibrator
Wien bridge
Colpitts
Hartley
Answer: D
An astable multivibrator is a relaxation circuit producing a square wave by charging and discharging between thresholds, with no resonant element and no sinusoidal behaviour. The other three sustain a sine by satisfying the Barkhausen conditions around a frequency-selective network. The two families are distinguished by whether energy oscillates between two storage elements or is repeatedly dumped, and every other difference between them follows from that.
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