PCBA Control Circuit Board Copying should follow points when placing decoupling capacitors in PCB reverse engineering:
1. The power input of the printed circuit board is connected to an electrolytic capacitor of about 100uF. A larger capacity would be better if the volume allowed.
2. In principle, a 0.01uF ceramic capacitor should be placed next to each IC chip. 1-10 tantalum capacitors can be placed per 10 chips if the clearance of the circuit board replica is too small to place.
3. A decoupling capacitor should be connected between the power line (Vcc) and the ground line to deal with components with weak anti-interference ability and large current changes during shutdown, as well as storage elements such as RAM and ROM.
PCBA Control Circuit Board Copying
4. Capacitor leads should not be too long, especially for high frequency bypass capacitors.
In the PCBA Control Circuit Board Copying, there are many kinds of ground wires, such as system ground, shield ground, logic ground, simulation ground, etc. Whether the electronic PCB design layout cloning of the ground wire is reasonable will determine the anti-interference ability of the circuit board. The following precautions should be considered when designing the ground wire and connection of the PCBA control circuit board:
1. Logic and analog grounds should be routed separately and cannot be used together. Connect their respective ground wires to the corresponding power ground wires, respectively. In the design, the analog ground wire should be as thick as possible, and the ground area of the front end should be increased as much as possible. In general, for input and output analog signals, the MCU circuits are best separated by optocouplers.
2. When copying the pcba controller circuit board of the logic circuit, the grounding wire should form a closed-loop form to improve the anti-interference ability of the circuit.
pcba controller board reverse engineering
3. The ground wire should be as thick as possible. If the ground wire is very thin, the resistance of the ground wire will be large, causing the ground potential to change with the change of the current, resulting in unstable signal level, thereby reducing the anti-interference ability of the circuit. If the wiring space allows, make sure that the width of the main ground wire is at least 2~3mm, and the ground wire on the component pins should be about 1.5mm.
