A Blocking oscillator uses ______ regenerative feedback

A Blocking oscillator uses ______ regenerative feedback

• A. Capacitive
• B. Inductive
• C. Mechanical
• D. Optical

Answer: (A)

Regenerative feedback in a blocking oscillator is achieved through capacitive coupling from the output back to the input. A small capacitor links the signal at the output (collector) to the input (base) so that the changing voltage portion is fed back in phase with the drive. This AC coupling means the base receives a reinforcing pulse that turns the transistor on, driving it toward saturation. As the pulse causes the output to swing, the capacitor transfers another trigger that sustains the conduction briefly, but as the capacitor charges, the base drive falls and the transistor turns off, allowing the cycle to repeat. The DC bias remains set by the resistors, while only the changing (AC) part of the signal provides the positive feedback, making the oscillator self-oscillate in short bursts.

Regenerative feedback in a blocking oscillator is achieved through capacitive coupling from the output back to the input. A small capacitor links the signal at the output (collector) to the input (base) so that the changing voltage portion is fed back in phase with the drive. This AC coupling means the base receives a reinforcing pulse that turns the transistor on, driving it toward saturation. As the pulse causes the output to swing, the capacitor transfers another trigger that sustains the conduction briefly, but as the capacitor charges, the base drive falls and the transistor turns off, allowing the cycle to repeat. The DC bias remains set by the resistors, while only the changing (AC) part of the signal provides the positive feedback, making the oscillator self-oscillate in short bursts.