It would be great if we start with the proven circuit of a practical audio peak detector. The circuit provided is a VU meter driver with bipolar peak detection. This clever design features a peak ...

The following circuit improves upon a simple peak detector by using a high frequency op-amp and feedback circuitry. The result is better accuracy and more sensitivity at the input. To view the ...

The circuit in Figure 1 uses a moderately fast, inexpensive comparator instead of a high-slew-rate op amp to implement the peak detector. This circuit provides wide bandwidth and high accuracy without ...

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, and the bias current ...

It’s a simple enough circuit but a very effective one. ... As an extra flourish, [Duncan] added some hardware audio signal peak detection, fed from the speaker output, ...

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.