Basic Qualification · B-004 Circuit components · B-004-001-004
To increase the level of very weak signals from a microphone you would use:
- A an RF amplifier
- B an audio oscillator
- C an audio amplifier
- D an RF oscillator
Correct answer: C — an audio amplifier. From the official ISED question bank, verified word for word.
Why
A microphone turns your voice into a very weak electrical signal that needs boosting before it can be sent out or recorded. The full explanation — and one for every question — is in Pro.
Practise this section
The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.