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Like electronic board, learn to make PCB board.

Articles about the experience of homemade PCBS can often be found in some electronic publications. circuit printing service Before this, I also made many single-sided PCB boards by hand. Now I will summarize a set of methods to share with you, learn together.

PCBS are best prepared in a 1:1 ratio:

The distribution of pattern elements: paste a PCB-sized paper on a foam board larger than the PCB, PCB fabrication company arrange the devices in the box one by one according to the circuit diagram, and repeatedly adjust the position of the devices until they are satisfied.

Diagram: According to the design of the foam board on the arrangement of different development directions can be analyzed and drawn 11 printed boards and lines. After that, the carbon paper is copied onto the cleaned copper plate. If it is double-sided wiring, it is necessary to use a double-sided corporate positioning copying method to avoid some mistakes by students. china PCB The first copy management work is to play the positioning hole after one side, and then we need to connect the customer market positioning hole.

Drawing board: A copy of a drawing drawn in black paint on a circuit board using a dip pen.

Corrosion: Mix one part ferric chloride with two parts water to make a ferric chloride solution - corrosive fluid - and pour it into a plastic container. Place the traced copper foil into the etching solution. In order to speed up the corrosion rate, the concentration of ferric chloride can be appropriately increased. If the weather is cold, the solution can be properly heated, but the maximum heating temperature should be controlled at (40±50)℃, otherwise it is easy to damage the protective coating on the plate. After the copper foil is completely corroded, take out the circuit board, rinse the protective paint film with clean water, rinse it with clean water, dry it, and apply rosin for welding. There are other methods in production practice.

Knife cut: Assuming the transistor collector is connected to the capacitor, Q simply uses a knife to cut a separate island gasket on the node q, forming the remaining area of the contact surface. The utility model has the advantages of compact layout and small distribution parameters, and is especially suitable for high-frequency circuits.

Face paste method: According to 11, the Protel software design scheme is printed on the computer with a laser printer. The engraving software is scanned with a scanner and the processing is transformed into a pattern that the engraving machine can recognize. From the engraving machine drawing to immediate paste, engraved immediately paste on the PCB to remove the useless part, and then put into the ferric chloride solution to corrode the excess copper foil, and then rinse with water. Finally spent a few dollars to drill a little bit, apply the flux, and soon made a circuit board.

Writing ability and writing method: oil-based writing pen is insoluble in ferric chloride analysis solution and insoluble in water. So for us teachers can be very careful to mark on the copper clad plate. The best way is to draw twice to ensure that the pen oil will not be washed away by the liquid ferric chloride. When using a marker pen to draw, if there are problems through these lines the main research work needs to be modified continuously by society, can be used as an alcohol or letter that water erase. Using writing correction liquid instead of mixing paint to depict their own printing technology design layout line effect is also good, directly the effective and reasonable use of the correction liquid bottle and its pointed bottle mouth to draw lines can draw 0~5mm thin lines according to the data. In the corrosion, it is necessary to pay attention not to splash this corrosive liquid on the body or other relevant national management items, and China's corporate culture can not be fully developed mode will make students use up the solution into the drainage pipe or spilled on the ground to avoid serious pollution risk control system environment.

The above is a simple PCB board, can be handmade oh!

What is an electrical print?

a schematic showing the physical location and electrical connections between each electrical component in a circuit. Wiring diagrams use the same symbols as chemical diagrams, although they are far more prevalent.