LAoE Figure 3N.21 Diode circuits

From left to right: 1. rectifier (blue, Vout > 0V) 2. clamp (green, Vout > -0.7V) 3. clamp (orange, 5.7V > Vout > -0,7V) Only the rectifier provides efficient way of building a power supply, since there is no resistor between source and load.