Parts list:


ICs:

IC1- PIC16F84A microcontroller
IC2- MCT2E opto isolator
IC3- NE555 timer Ic
IC5- 7805C or 7805CT regulator IC

Resistors (all 1/4th W unless otherwise stated):

R1- 10K, 1W
R2- 15K
R3 to R6 - 2.2K
R7 - 2.2K (eight pieces for eight relay circuits)


Capacitors:

C1- 0.47uF/200V non electrolytic
C2- 47uF/25V electrolytic
C3,C4 - 22pF non electrolytic
C5- 0.01uF non electrolytic
C7,C8 - 0.1 uF non electrolytic
C9,C10- 100uF/25V electrolytic


Transistors:

BC547 - eight pieces


Relays:

12V, 60mA (or less) relay with 2A SPDT switching contacts - 8 pieces


DIP switch:

4 switch DIP


Diodes:

D1,D2 - 10V, 500mW zener diodes
D3 - 1N4007
D4 - 1N4007 (8 pieces for 8 relay circuits)

Crystal:

Q1 - 4MHz ceramic crystal resonator