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A transistor have 3 legs. B, C and E.
You can measure the resistance between the legs with a multimeter in order to get a good indication of its condition.
If the resistance between any of the 3 legs are close to 0 Ohm (often 0.1 to 6 Ohm) then the transistor is most likely burned and no good any more.
If the resistance is above 200 Ohm, then the transistor is most likely burned as well.
Note:
A good transistor will measure different values depending on where you put probes. If the probes indicate an awful lot of resistance then try to switch the probes and measure again. If resistance is the same, then it is burned. If not, then it is likely OK.
It is often difficult to tell if your transistor is actually a Fet or a Darlington.
try to search internet for proper data on your 'transistor'.
Small signal transistors are often burned open between legs (very large resistance) where as large transistors often shortcut between legs (Very low resistance between legs).
I find the C and E leg to be easiest to diagnose a transistor on.
If the resistance both ways are the same, then it is no good.
Note:
In order to 100% determine a transistors condition, then you often would need to desolder it first. All the other components on a printboard will make it harder to diagnose (unless it has shortcut).
ANSWER: pay attention to the probes polarity and whether is an PNP or NPN . For an NPN The positive lead goes to the base and either other lead will show resistance reverse the leads and repeat now both reading should be hi resistance. For the PNP SAME PROCEDURE EXCEPT THE POLARITY OF THE LEADS ARE REVERSED
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoThere are transistor testers. The down side is that the transistor has to be removed from the circuit to be tested.
Wiki User
∙ 13y agoIt is defective if it is shorted, leaky or open.. To determine if it is open, just test it with a multitester
Wiki User
∙ 11y agoyou buy them
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Where can I find output transistors to repair and amplifier?
You need to know the specifications for the transistors and search for them on the internet.
Why are npn transistors used more often than pnp transistors?
The primary reason that NPN transistors are used more often than PNP transistors is that they usually operate faster (at higher frequencies) because the mobility of the current carriers in NPN transistors (electrons) is much higher than that of the current carriers in PNP transistors (holes).
How many transistors can you find on CPUs today?
The no.of transistor integraeted in the prosses..................
Why do transistors sometimes need heatsinks?
These types of transistors are power transistors and generate heat. The heat sink is used to dissipate the heat. If the transistor gets too hot it will fail.
Can you see transistors?
Basically, in transistor, the signal is transferred from low resistance circuit to the high resistance circuit. So it is called transfer+resistor=Transistor.Transistors are widely used in different types of switching, amplifiers, oscillators and integrated circuits.Based on the applications, the types of the transistors are as given below:General purpose transistors, Low frequency transistors, High frequency transistors, Power transistors, Switching transistors, Field Effect Transistors, MOSFET, Uni-junction Transistors, Bi junction transistors, Photo transistor, High power transistors, Complementary pair, Darlington amplifier, Video and R.F. amplifier, Ultrahigh frequency and microwave, Insulated gate bipolar transistors, Static induction transistors.More their to know about transistors are as given below:History of invention, Time-line throughout, Basic construction, Bias arrangement, working, Various currents in transistors, Basic transistor amplifier, Configurations, Characteristics, Current gain and relation among them, D.C. load line, Operating point, Biasing of transistor, stability factor, specifications and ratings, testing, colour coding, identification of transistor using multimeter, h-parameter of transistor, particular applications etc...
Where can I find output transistors to repair and amplifier?
You need to know the specifications for the transistors and search for them on the internet.
How many transistors can you find in a CPU today?
on the order of a billion
How many transistors in a modern laptop?
A modern micro processor has atleast 100 million transistors.
How many transistors would you find in a CPU to day?
An 18-core Xeon Haswell-E5 has 5,560,000,000 transistors.
What are power transistors?
Power transistors are transistors that are used in high-power amplifiers and power supplies.
What is the need to study transistors?
It is a need to study transistors because it concerns science and would help you find a work concerning technology more easily.But be careful of the effects of electricity as it will harm you.
What is need to study transistors?
It is a need to study transistors because it concerns science and would help you find a work concerning technology more easily.But be careful of the effects of electricity as it will harm you.
Are transistors semiconductors?
Transistors are made out of semiconductors, yes.
What element are in transistors?
Silicon and germanium are the elements used in transistors
What elements in in transistors?
Silicon and germanium are the elements used in transistors
Why are npn transistors used more often than pnp transistors?
The primary reason that NPN transistors are used more often than PNP transistors is that they usually operate faster (at higher frequencies) because the mobility of the current carriers in NPN transistors (electrons) is much higher than that of the current carriers in PNP transistors (holes).
What elements are used in transistors?
Silicon and germanium are the elements used in transistors
