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This is a dual-supply precision full-wave rectifier board that can turn alternating current (AC) signals into single polarity signals. The OPAMPs, U1A, and U1B, buffer the input signal and compensate for the voltage drops across D1 and D2 allowing for small signal inputs. This implementation functions with limited distortion for 20Vpp input signals at frequencies up to 50 kHz and for signals as small as 50 mVpp at frequencies up to 1kHz. The circuit can be used in applications that need to quantify the absolute value of input signals which have both positive and negative polarities.
Precision Full-Wave Rectifier – Dual-Supply – [Link]
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