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Positive and negative polarity DC voltage outputs are often needed to drive various electric circuits and components. One common example is driving op amps, like the one illustrated here, in which a positive 10 volts and negative 10 volts is needed to drive the amplifier. Some DC power supplies may already have these polarity outputs available. However, many power supplies do not have them available. You can still get positive and negative voltage outputs as long as you have at least two DC power supplies with floating outputs. Today, I will show you how to set up two precision 1787 B DC power supplies to get a positive and negative voltage output. I will also show you how to do the same on a B&K precision 1673 triple output power supply to get positive and negative voltage outputs. To obtain positive and negative voltage outputs from the 1787 B supplies, the setup is simple. Connect both 1787 B supplies in a series connection. This means connecting the positive terminal of the first supply to the negative terminal of the second supply. This series connection will be used as the reference ground. Now, the positive voltage output with respect to the reference will come from the second supply, while the negative voltage output with respect to the reference will come from the first supply. For demonstration, I will set both supplies to output positive 10 volts and negative 10 volts. To verify the output voltage and polarity, I will use a B&K precision 28:31 yi multimeter. When I connect between the negative terminal of the first supply and the reference ground, the multimeter measures negative 10 volts. When I connect between the positive terminal of the second supply and the reference ground, the multimeter measures positive 10 volts. Here is a diagram to illustrate the circuit equivalent...