*Question E7H04:
How is positive feedback supplied in a Colpitts oscillator?*  

*Correct Answer is  C: Through a capacitive divider*  

### AI Response: (may contain errors)  

In a Colpitts oscillator, positive feedback is essential for sustaining oscillations. The correct answer to how this feedback is supplied is:

**C: Through a capacitive divider.**

### Explanation of the Correct Answer:
- **Capacitive Divider**: In a Colpitts oscillator, the feedback is provided by a capacitive voltage divider formed by two capacitors in series. This divider allows a portion of the output voltage to be fed back to the input, which is necessary for the oscillator to maintain its oscillations. The capacitors are typically connected to the base or gate of the active device (like a transistor or FET), ensuring that the feedback is in phase with the input signal.

### Why the Other Choices are Incorrect:
- **A: Through a tapped coil**: 
  - This method is more commonly associated with other types of oscillators, such as the Hartley oscillator. In a Colpitts oscillator, the feedback is specifically through capacitors, not a tapped coil.

- **B: Through link coupling**: 
  - Link coupling refers to the use of inductive coupling between circuits, which is not the primary method of feedback in a Colpitts oscillator. This method is not used for providing the necessary positive feedback in this specific oscillator design.

- **D: Through a neutralizing capacitor**: 
  - A neutralizing capacitor is used to cancel unwanted feedback or oscillations in certain circuits, particularly in RF amplifiers. It does not provide positive feedback; rather, it is used to stabilize the circuit by reducing feedback that could lead to unwanted oscillations.

### Summary:
In summary, the Colpitts oscillator relies on a capacitive divider for positive feedback, which is crucial for its operation. Understanding the role of feedback components is key to mastering oscillator designs for the Extra Class exam.