R1= 10Kohms
R2-9= 1Kohms
C1= 0.47 until 2.2uF 16V
C2= 100uF 16V
C3= 47uF 16V
Q1-8= BC550
DSP1= Display 7 segment common cathode
IC1= 4011
IC2= 4026
D1-2= 1N4148
TR1= 470Kohms trim. or pot. lin
TR2= 100Kohms trim. or pot. lin
S1= 1Χ2 Switch
S2-3= Push Button normal open
BATT= 9V Battery οr ext. supply