Parts:
R1,R2,R19_______1K 1/4W
R3-R6,R13,R17_100K 1/4W
R7,R15__________1M 1/4W
R8_____________50K 1/2W
R9____________470R 1/4W
R10___________470K 1/4W
R11___________100K 1/2W
R12___________220K 1/4W
R14,R16________68K 1/4W
R18____________22K 1/4W
R20___________150R 1/4W
C1,C7_________100µF 25V
C2,C3_________330nF 63V
C4-C6___________4µ7 25V
D1,D5______Red LEDs
D2,D3________1N4148 75V
D4________BZX79C7V5 7.5V 500mW
IC1__________CA3140 or TL061
IC2____________4069
IC3____________4098 or 4528
Q1,Q2_________BC238 25V 100mA NPN
L1_____________10mH miniature Inductor
BZ1___________sounder (incorporating 3KHz oscillator)
