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multiple volt power supply:
multi power supply schematic
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U1LM7812 +12 VDC Voltage Regulator
U2LM7912 -12 VDC Voltage Regulator
U3LM7805 +5 VDC Voltage Regulator
U4LM7905 -5 VDC Voltage Regulator
BR1, BR24 amp bridge rectifier
T125.2 volt, 3 amp center-tapped ac transformer
T218 volt, 2 amp center-tapped ac transformer
F15 amp slow-blow fuse
S2SPST toggle switch
C1, C5, C9, C132,000 uF electrolytic capacitor, 35 volt min.
C2, C3, C6, C7, C10, C11, C14, C151 uF tantalum capacitor, 35 volt min.
C4, C8, C12, C16100 uF electrolytic capacitor, 35 volt min.
MISC.fuse holder, heat sink for voltage regulators, binding posts, ac cord with plug, chassis

all capacitors are 10 percent tolerance
Please operate caution when building this power supply. It is run on standard 117 ac current - and under the right circumstances 117 ac can kill you. Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use the power supply if it's wet, and never run it without the specified fuse.
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