Negative Low current powersupply circuit

Negative Low current powersupply circuit diagram

Device list
Resister
R1,R3 = 1.5k 1/4w
R2 = 5k 1/4w
Capacitor
C1 = Ceramic 0.047 uf 50 v.
C2,C3 = Electrolyte 220 uf 16 v.
Semiconductor
IC1 = Number 555
D1-D2 = Diode 1N4001