Police Car Siren circuit using 9013, 9012

Police Car Siren circuit

Police Car Siren circuit

R1 …………. 68K ohm
R2 …………. 22K ohm
R3 …………. 68K ohm
R4 …………. 47 ohm
C1 …………. 50uF – 12V
C2 …………. 0,05uF
C3 …………. 100uF – 12V
TR1 ………… FCS – 9013
TR2 ………… FCS – 9012
S1 …………. Push Switch