Circuit Design

 List of Components

No.	Component	Quantity
	Resistor
1	1k	4 pcs
2	15k	8 pcs
	Preset
3	10k	6 pcs
	Capacitor
4	100nF (ceramic)	32 pcs
5	470uF 16V (electrolytic)	1 pcs
6	10uF 16V(electrolytic)	1 pcs
7	1uF 16V (electrolytic)	2 pcs
	Diode
8	4148	4 pcs
9	IN 5818	8 pcs
	IC
10	NE555	2 pcs
11	TLC 3702	2 pcs
12	IC base (8 pin)	4 pcs
	Voltage regulator
13	L7805	1 pcs

PCB design by using Design Spark Software

3D top preview

 3D bottom view

1) Print the PCB layout on the gloss paper / photo paper by using laser jet printer.

2) Then rub the PC board surface by using scouring pad until the oxidised layer cleaned.

3) After that, clean the PC board surface with paint thinner until oxidised dust totally clean.

4) Place the photo paper face down on the copper clad board.















5) Use a hot clothes iron to transfer the track pattern from the paper to the copper board. Then cut the board suits designed layout.









6) Put the board in the acid solution (Ferric Chloride) and agitate until the unwanted copper traces are completely etched.

7) Rinse the board with a tap water and dry it.

8) Drill holes (holes should be at least 0.1 mm bigger than pins / wires) 

9) Dissolve the printed toner with paint thinner.

10) Put the component at proper place and solder it.