Figure 0.6, Full-Wave Center-Tapped Rectifier Power Supply. A transformer is shown with no connections to its primary. It is presumed that the primary connects to the electric utility line in some way. The secondary has a center tap. The top end of the secondary connects to the anode of D1. The bottom end of the secondary connects to the anode of D2. The cathodes of D1 and D2 are connected together and go to the positive output terminal. The secondary center tap connects to the negative output terminal. The positive end of a capacitor connects to the positive output terminal. The negative end of the capacitor connects to the negative output terminal. This completes the verbal description.
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