Parts list:

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

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Resistor Value Calculator

Hold the resistor such that the 3 bands that are closer to each other come to your left as shown below: -------- -------- 12 3 4 1= Band 1 2= Band 2 3= Band 3 4= Band 4 Now select the color of each band here =====>>	Band 1	Band2	Band 3	Band4(tolerance)
	BLACK BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GREY WHITE	BLACK BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GREY WHITE	BLACK BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GREY WHITE GOLD Silver	GOLD Silver No Color
	Resistance= ohms, Tolerance= %

Naveen P N, http://electronic-circuits-diagrams.com

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