The -12 volt power supply is not required for all possible analog circuits; many require only the +12 volt supply you have already built and tested. However, a number of analog circuits do require power supplies of both polarities so that their inputs and outputs can handle and deal with both positive and negative voltages. The most generally familiar device that requires dual power supplies is the Operational Amplifier, or op-amp. Since a number of our experimental circuits will involve op-amps, we will need the -12 volt supply. In addition, we want to improve the precision and versatility of this power supply as we demonstrate one of the many applications of op amps. Hence, a dual power supply is essential.
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minus_12_volt_ps.html
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