This is a design circuit for a power supply circuit that provides +12V, -12V, +5V, and -5V regulated outputs. This is just a more complex derivative of a basic negative/positive voltage supply. This is the figure of the circuit;
Two separate sets of transformer and diode bridge are used to generate the +/-12V and the +/-5V, but the rectification circuits are almost identical. The only difference is the voltage regulator IC's used. The 7812 and 7912 are used to regulate the +12V and -12V outputs, respectively. The 7805 and 7905, on the other hand, are used to regulate the +5V and -5V outputs, respectively. Note that these voltage regulator IC's need to be attached to adequate heat sinks if used in applications that require high power.
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