![]() Op-amp based peak detector circuit is the modification of basic peak detector circuit, used to remove the voltage drop across the diode. So, this voltage drop at diode reduces the efficiency of the circuit, and to improve the design next we will use Op-amp.įor detecting the negative peak of the input signal connect the diode in the reverse condition. Here, in the output waveform, you can the see the peak is shifted down because of the voltage drop acrosss the diode in the circuit. Where V IN is the input signal voltage and V D is the voltage drop across the diode. The output of the circuit will be defined as V OUT = V IN - V D To hold the charge and slow down the discharging of capacitor choose the load R L of very high value. So, when the input signal is decreasing the capacitor starts discharging through the load R L. Practically the output is taken across some load connected to the circuit. Hence, this is called as Peak Detector and the output waveform will look like the image given below, Now, in the negative half cycle of the signal, the diode gets reverse biased and at that time the capacitor holds the peak value of the previous half cycle. At the same time, the capacitor starts charging to the peak value of the input signal until the diode remains forward biased. In the positive half cycle of the signal, the diode will be forward biased and allows the current to pass through it. Below is the schematics for a Basic Peak Detector Circuit. The diode is placed in forward biased condition and for output, the oscilloscope probe is connected between the diode and capacitor. In our circuit, we are giving a sine wave input from a 220v to 6v step-down transformer. A Simple Peak Detector Circuit can be built by using a diode and a capacitor.Ī basic peak detector circuit is a connection of a diode and a capacitor in series. For a Basic Peak Detector Circuit, we don’t even need any complex electronics components. ![]() So, like this there are number of applications where a Peak Detector Circuit is used. ![]() Peak detectors are generally used in the sound measuring applications to find the maximum level of sound in a particular area or place, that helps in determining the maximum loudness level in that place. Peak Detector Circuit is used to find the peak amplitude in a rapidly changing waveform. ![]()
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