When we get a product in India, many times, we do not have a circuit diagram. In this case, how do we tell the principle and working conditions of the circuit board? This is to restore the actual product to a circuit schematic diagram-this is PCB reverse engineering India.
When encountering some small natural objects, or when there is a need. When experiencing electronic products without drawings, .you need to draw a circuit schematic diagram based on the physical item to reverse the physical object into a circuit schematic diagram. Although it becomes very complicated on a larger scale, I believe we can still do it after mastering the following points. For a simpler circuit, it is not a problem.
We Select components such as integrated circuits, transformers, transistors, etc. Many pins play a significant role in the course and then start drawing from the selected reference components’ pins to reduce errors.
Suppose the printed board is marked with component serial numbers (such as VD870, R330, C466, etc.) because these serial numbers have specific rules. In that case, the components with the same first Arabic number after the English letter belong to the same functional unit, so they should be used skillfully when drawing. Correctly distinguishing the components of the same available team is the basis of drawing layout.
Suppose the serial number of the component is not marked on the printed circuit board. In that case, it is best to number the component by yourself to facilitate the analysis and calibration of the circuit. To make the copper foil trace the shortest when designing the printed board arrangement of the details, the manufacturer generally arranges the same functional unit members relatively concentratedly. After finding the device that plays a core role in a sure team, you can find other components of the same available squad as long as you follow the search.
Correctly distinguish the ground wire, power wire, and signal wire of the printed board. Taking the power supply circuit as an example, the opposing end of the rectifier connected to the power transformer’s secondary is the positive pole of the power supply. A large-capacity filter capacitor is generally related to the ground, and the capacitor shell has a polarity mark. It can also find the power line and ground line from the pins of the three-terminal regulator.
The factory usually sets the ground wire’s copper foil to the widest (large-area grounding copper foil is often used in high-frequency circuits). When we print, the circuit board is wired in the factory. The foil is the narrowest. Also, in electronic products with analog and digital circuits, the printed boards often separate their respective ground wires to form an independent grounding network, which can also be used as a basis for identification and judgment.
To avoid excessive wiring of component pins and cross-cutting the wiring of the circuit diagram, resulting in a messy drawing, It can use many terminal markings and grounding symbols for power and ground wires. If there are more components, the unit circuits can be drawn separately and then combined.
When drawing a sketch, it is recommended to use transparent tracing paper and use a multi-color pen to classify the ground wires, power wires, signal wires, and components by color. When modifying, gradually darken the paint to make the drawing visually and eye-catching to analyze the circuit.
Familiar with the elemental composition and classic drawing methods of some unit circuits, such as rectifier bridge, voltage regulator circuit, an operational amplifier, digital integrated circuit, etc. First, draw these unit circuits directly to form the circuit diagram framework, which can improve drawing efficiency.
When drawing circuit diagrams, you should find circuit diagrams of similar products for reference as much as possible, which will do more with less.
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