 Connecting them in this way reduces the effective loading on the Metadyne, and enables a smaller machine to be installed.The Metadyne acts as a "positive or negative booster".If Vcc is the supply voltage, and V2 is the output voltage of the Metadyne, then the total voltage across the load can vary from 0 to 2·Vcc, as V2 varies between −Vcc and +Vcc.