If the polarity of the power supply is inversely connected, VD is inversely biased and cut off. In the figure above, if the polarity of the power supply is not wrong, VD will conduct, just like a closed switch (the positive voltage drop of about 0.2v is ignored here), and the circuit board will work electrically. This can be avoided by attaching a schottky diode to the positive power input of the circuit board. Some electronic beginners in electronic production or maintenance, sometimes due to the wrong polarity of the power supply and damage to the circuit board components. Two specific application circuits are described below.ġ, a schottky diode composed of the protection circuit.Ĭapacitor C is the power filter capacitor on the circuit board.
Schottky diode has a small forward voltage drop (generally 0.2 ~ 0.3v) and good high-frequency performance, which is suitable for use on circuit boards to prevent the power connection from damaging the components, and the cost is also very low.
#Capacitor anode cathode how to
How to add schottky diode to circuit board to prevent negative and positive electrode from being reversed You can compare by yourself should understand. Another: according to the color of your line judgment is generally red to the positive pole, yellow to the negative pole. Negative plate grounding wire of the electrolytic capacitor with the largest volume. If the circuit board has metal shielding wire, the metal wire is the ground wire in the circuit board.Ĥ. Some components have metal enclosures, such as switchgear, that enclose grounding wires in the circuit.ģ, shielding wire metal mesh is the ground wire.
The metal shell of components is ground wire. The ground copper foil is usually thicker than the normal wire, and is connected everywhere on the circuit board.Ģ. Large-area copper foil line is ground wire.
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