Test Supply
This is a test supply for 100- to 1000-W systems (Fig. 21-1).
  Figure 21-1 Test supply schematic.
Please read the following carefully:
This piece of equipment should be used when direct line voltage circuits are being tested. It is a valuable, useful, and possibly lifesaving addition to any electronics lab; it certainly is a circuit-saver!
Many of the higher-powered projects in this book use half and full bridge switching ...

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