+ - 15V. Regulator powersupply cicuit

+ - 15V. Regulator powersupply cicuit diagram

Device list
Capacitor
C1,C2 = Electrolyte 470 uF/35V.
C3,C4 = Electrolyte 470 uF/25V.
Semiconductor
IC1 = Number 7815
IC2 = Number 7915
D1-D4 = 1N4001
Other
Tranformers stepdown 220 vac input 12 vac output 1A.