. 2018 Aug 10;6:327. doi: 10.3389/fchem.2018.00327
Copyright © 2018 Pennazza, Santonico, Vollero, Zompanti, Sabatini, Kumar, Pini, Quiros Solano, Sarro and D'Amico.
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Figure 4.
Schematic of a lock-in amplifier.