How to Identify Circuit Board Parts Easily

How to Identify Circuit Board Parts Easily


Circuit board parts aren’t always easy to get. Especially if you have to keep going to market for smaller components, it becomes a painful trip with time. What if you had information about the identification of components; This would allow you to get tons of use circuit board parts from already used or discarded electronic circuits. This list is by no means complete. It only describes some essential components of the circuit board to be identified and used for your circuit designing.




Given below are fundamental components to be identified on circuit board.


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The resistors are often color coded, while some have their tolerance and ohm value printed on them. You can use a multi-meter to check for resistance when they are still soldered to the circuit board; This often gives an accurate amount. Commonly they are marked with R on circuit board.




These components are variable resistors; the cost is usually marked in ohms. The value is often of 3 digits, where 1st two digits are significant figures while third is a multiplier, for example, having 123 as a value means 12 with three zeros ahead; This implies a resistance of 12k ohms. They also have a letter code in them which indicates the resistance changes. They often have VR marked on them to identify them as variable resistors.


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Besides resistors, capacitors are another type of most common circuit board parts. Typically marked with C on circuit board, many are color-coded and have their values marked on them.


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The inductors are tricky ones compared to other board parts. They are often marked with an L on a circuit board. However, it is best if one has a multi-meter in case if the value is to be measured. Inductors are of two types. One is the color-coded type. The other one is wired coil types. In both cases, it is best to measure inductance by self to ensure correct choice of components.




Crystals are often marked with X or Y on circuit board. Due to their unique appearance, they are easy to be identified and distinguished from other components. They usually have values written on them regarding frequency, e.g., 32 Hz, 16 Hz. Etc.





Relays have K marked on circuit board. They also come with many specs written on them.


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Having coin batteries are pretty easy to be identified.