Sometimes a bridge is not normal, eg when it comes to high accuracy. Then Praezisionsgleichrichter be used. Here, Links to good circuits.

Here you will find Schematic Circuit Diagram for DIY and further information on Praezisionsgleichrichter
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Standard Praezisionsgleichrichter with Operationsverstaerker

www.elektronik-kompendium.de/public/schaerer/syncrec.htm