How to make a printed board before there is no PCB board factory?01
This method is the most direct. The designed copper foil pattern was overwritten with carbon paper on the surface of the copper-clad copper foil. The special engraving tool grinded with the hacksaw blade was used to describe the copper foil pattern directly along the edges of the copper foil pattern, cutting it to the depth as far as possible. Then tear away the unwanted copper foil outside the pattern, and then drill it with a hand drill. The key to this method is: the intensity of the sculpting should be enough; to tear off the excess copper foil from the edge of the board, when the operation is good, it can be gradually teared into pieces, you can use a small needle nose pliers to complete this step. Some small circuit experiments are suitable for this method.
2. Manual drawing method
A piece of paint (that is, shellac, sold in chemical raw materials stores) is dissolved in three parts of anhydrous alcohol, and is stirred appropriately. After all of the ingredients are dissolved, a few drops of medical purple water (gentian violet) are added to make it appear. A certain color, after stirring evenly, can be used as a protective paint to draw the circuit board.