The Basic lessons · Circuit components · B-004-001

Amplifiers: Boosting Signals Without Distortion

Learn how amplifiers increase signal strength for radio and audio, and why keeping them linear prevents distortion. This lesson explains gain, efficiency, and the specific frequency ranges used in amateur radio.

This lesson is free to read; the rest are part of SignalPrep Pro. The subsection's 11 exam questions are free to practise: practise B-004-001.

What this subsection asks

• What term describes a circuit designed to increase the amplitude of a signal?
• If an amplifier becomes non-linear, the output signal would:
• To increase the level of very weak radio signals from an antenna, you would use:
• To increase the level of very weak signals from a microphone you would use:
• What range of frequencies does the speech amplifier of an amateur radio transceiver typically process?
• Apart from power and current, which signal property can amplifiers be specifically designed to increase?
• The increase in signal level by an amplifier is called:
• A device with gain has the property of:
• A device labelled "Gain = 10 dB" is likely to be an:
• What term describes the ratio of output power to DC input power of an amplifier?
• What is the result of excessive positive feedback in an amplifier stage?