There is always a need for a good power supply. Here is a schematic for a 12 volt power supply. Note this could also be done with a 7805 5v regulator, and a “T1 12.6 volt, 1.2 amp ac transformer” . The transformer brings the AC 120v down to around 18v, and the 4-diode rectifier circuit converts the AC waveform to DC. The Cap C1 evens out the ripple out of the rectifier, and the 12v regulator brings the 18v to a constant 12 volts.
Here is another schematic that gives both a 12v, and a 5 v power supply. This circuit has a common ground, and has both a +5v, and a -5v regulator, so this could be used to power an opamp where you need these voltages. This would be a good project for that lab powersupply that you need. Anytime one is messing with AC voltage, a person needs to take caution. The fuse in the circuits is very important, and also, these projects should be placed in a plastic project box.[Link]
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