Reverse Engineering PCB Card Sidedroad Capacitor

Reverse Engineering PCB Card Circuitry scheme will help engineer to extract the layout drawing from phyical PCB card, through which the Gerber file will be generated for further PCB board cloning;

When clone PCB board, Sideroad capacitor usually play the role of decrease the transient power supply requirement on the power module when copy beside the high frequency component. Normally aluminum capacitor and tantunm capacitor is more suitable for sideroad when Reverse Engineering PCB Card. And its value depends on the on transient current requirement on the PCB, normally 10-470LF, if there are lots of integrated circuit , high speed switch on/off and power supply with long lead, then great capacitance capacitor should be chosen.

Decoupling Capacitor installation

1> connect 10-100LF electro on the power supply output terminal when cloning circuit Card, use 100LF is better if possible;

2> fundamentally all the integrated circuit chip should be copyed a 0.01pf ceramic capacitor on the PCB card, if there is not sufficient space on the PCB card, can place one piece of 1-10PF tantalum capacitor on every 4-8 piece of chips;

3> as for the component with great change when power off the supply or with weak capability to resist noise, such as RAM, ROM memorizer, decoupling capacitor should be placed directly among the power track and grounding track;

4> the capacitor lead shouldn’t be too long especially there shouldn’t be any lead on the side of high frequency capacitor;

5> since there is contact, relay and press button in the PCB card which will cause great discharge current, so when circuit board cloning, must apply RC circuit to absorb the discharge current, and R is 1-2K, C is 2.2-47LF;

6> CMOS has high input impedance and quite sensible, so it is unused terminal should be connected to grounding or anode side.

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