Classic Peak Detectors. Some classic circuits are still going after many decades. One of them is the peak detector, in certain cases called the peak-hold circuit. A peak detector does just one thing – ...

The standard hardware requirements for sample-and-hold and peak detector circuits apply to D1, C1, and A2. C1 must be a high-quality capacitor, D1 must be a low-leakage diode, ...

The diode bias current is created by a transistor-based peak detector circuit driven off the main audio signal. But don’t just take our word for it, watch the video after the break.