Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-001-006
Positive feedback from a capacitive divider indicates the oscillator type is:
- A Miller
- B Colpitts
- C Pierce
- D Hartley
Correct answer: B — Colpitts. From the official ISED question bank, verified word for word.
Why
A Colpitts oscillator uses two capacitors in series to split the voltage and feed a portion back to the input, creating the positive feedback needed for oscillation. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.