Diode Envelope Detector | Amplitude Modulation AM Demodulation
The diode detector has been used for many years for detecting or demodulation signals using amplitude modulation, AM. The AM diode detector offers simplicity and low cost. The circuit for the AM diode detector uses a diode, capacitor and a load resistor which is often the volume control for the audio stages.
The video looks at the characteristics of a diode and how this can be used to rectify the amplitude modulated signal to recover the audio. The way in which the detection or demodulation process operates is shown in an easy to understand fashion.
The AM diode detector circuit is also used as a peak detector for RF signals where again its simplicity is a great advantage.
In the video we also look at what amplitude modulation is: how the amplitude of the signal varies in line with the modulating audio signal.
Amplitude modulation is mainly used for broadcasting on the long, mediaum and short wave bands. It has been used since the beginning of the twentieth century and is still in use today.
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