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Peak detectorPeak detector is a device designed to store the peak (minimum or maximum) value of the input signal (Vin). The memory element is capacitor C, charged by peak voltage values through diode D.
To clear the stored peak value, switch K must be closed. The capacitor discharges and the voltage on its plates becomes zero. After opening switch K, the device is ready for operation again. To store the negative value of Vin, the polarity of the diode must be changed to the opposite. In real devices, switch K is implemented on a transistor. Most often, the peak detector is used in sound-reproducing equipment to indicate peak signal levels. |
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