Half-wave rectifier

The circuit provides for accurate half-wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is -1. By reversing both diodes, the polarity can be inverted. This circuit provides an accurate output, but the output impedance differs for the two input polarities and buffering may be needed.
Half-wave rectifier  - schematic

The output must slew through two diode drops when the input polarity reverses. The^NE5535 device will work up to 10 kHz with less than 5% distortion.

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