From the course: Electronics Foundations: Semiconductor Devices
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Detect the signal peak
From the course: Electronics Foundations: Semiconductor Devices
Detect the signal peak
- [Instructor] A peak detector is a circuit that measures the peak amplitude of a signal to determine the highest voltage that a signal reaches. One common use for peak detectors is in audio processing systems. Since the volume of an audio signal will vary depending on its voltage levels, by monitoring the audio signal with a peak detector to determine its maximum value, a sound system can appropriately scale its output. I can build a simple peak detector circuit by connecting a diode in series with a capacitor. When a positive input voltage is applied to this circuit, current will pass forward through the diode and charge the capacitor up to that value. If the input voltage is then reduced, that charge stored in the capacitor doesn't have anywhere to go since current can't pass backwards through the diode. If the input voltage is then reduced, that charge stored in the capacitor doesn't have anywhere to go since…
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