Smt Resistor
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Smt Resistor
3 Types of Electronic Components
Electonic components are usually packed singly and different names have been given for each, such as the diode,Transistors, Ics and so on. They have been classified into passive devices and active devices.
Diode is this one-way valve used for electrical current. The function of it is to let the electricity to flow in one direction from positive to negative, and not in the opposite direction. Most diodes look similar to a resistor and always have a painted line on one end showing the direction or flow. The negative side should be on the negative end of the circuit to enable the current to flow. If the negative is by mistake placed on the positive side of the circuit, no current will flow.
The transistors are one of the most important inventions of the modern world.They have two basic functions (a) to act as a switch to turn the current on and off and, (b) to act as an amplifier which converts an output signal to a magnified version of the input signal. There are different sizes of transistors which depend on their application. It may range from a big power transistor used in power amplifiers of the stereo, down to SMT and even down to .5 microns wide such as in a microprocessor or Integrated Circuit.
ICs are actually complex circuits inside one simple package, which are made out of silicon and metals so as to simulate resistors, capacitors, transistors, etc. They are compact and small in size. These electronic components have been packed in a large variety of packages and sizes. Circuits have "pins" coming out of them. Circuits are used for performing the task of a simple timer, to that of a complex logic circuit, or even a microcontroller with erasable memory built inside.
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SMT parts how do I tell what they are?
I have a circuit board I am trying to redesign but there are three SMT parts that have NO markings on them. They are extremely small and I used a magnifier to take them off and look for a PN or something. There are NO destinguishing marks on them. They all have two contacts so I figure they are either a resistor, a diode, or a capacitor. Does anyone have any idea on how I could test the to see what they are and what there values are.
Thanks
You can narrow it down to either a resistor or capacitor, and probably only a capacitor. The vast majority of SMD diodes will have some kind of marking. Most resistors (even commercial ones) will also have some kind of mark on them.
The majority of SMD components I have seen that do *not* have markings are capacitors, although I have seen a few resistors without marks, but rarely.
The best way to determine what kind they are is to temporarily remove them and use an RLC meter (with SMD mounts) to determine their type and value. Either that, or partially reverse engineer the board to find out how these components are used.
This meter is relatively new (there are several brands out, now) I haven't used them, but they look to fit your problem, well.
http://www.smarttweezers.com/?gclid=CLjxkY-No48CFQJsPAod00pHfA
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Super SMT Component Kits
