Exam-style question
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Describe the function of an astable multivibrator circuit and explain what makes it oscillate continuously.
Model answer
What a good answer should say
- An astable multivibrator is a type of flip‑flop that has no stable state; it continuously switches between two states, producing a square‑wave output.
- The circuit uses two cross‑coupled amplifying stages (often with transistors or op‑amps) and timing components (resistors and capacitors) that charge and discharge alternately.
- Because each stage’s output feeds the other’s input, the charging of one capacitor forces the other to discharge, creating an endless cycle of oscillation.
Explanation
Why this works
The answer demonstrates recall of the basic definition and understanding of the feedback mechanism that drives continuous oscillation. It tests the student’s ability to link the circuit’s structure to its function, covering both conceptual and functional aspects of astable circuits.
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