The method of extracting the transistor's base, emitter and collector leg with multimeter

Assalamu Alaikum

I have come with Noor Alam, an important topic in front of you today,

The topic we will discuss today is the method of extracting transistors' bays, emitters and collector legs with multimeters;

And let's go to our main discussion -

We'll divide today's discussion into a few areas so that you can easily understand.

How do I understand the transistors that are good with the multimeter? - The question comes almost every day in our electronics,

Typically, if the model number is written on the transistor, or if the model is known, then when it is typed in Google it can be known that the pinout of the transistor - ie a pin base, a pin emitter or a collector. Also the signature of the transistor datasheet is written.

Figure 2N2222 and BC547 transitors show two types of pinout. Here,

E = Emitter,

C = Collector and

B = Base.

In such a case, the neo-hobbyists and engineers have to face a lot of danger, thinking that "I have a transgender that has the leg's leg. Which pin will I take in the circuit with the base, the collector, the emitter? !! If the wrong way, the circuit will not work! "

Sometimes, the transistor is not written on the model number or the transit of the transistor is not available, what is the way?

In these cases it is necessary to extract the transistor leg by multimeter. It is possible to easily remove pinout with a multimeter that has the ability to measure resistor or diode.

The advantage of finding the leg of the transistor

This ensures that what a leg is about. Due to data and datasheet and nets are often complex and confusing. (Note the example of transistor at 2N2222 / BC547 above)

Make sure the transistor is good.
How to get started

We will maintain this continuity in both NPN or PNP-

1) The first thing to do is to determine the base of the transistor with the multimeter

2) Then we have to calculate the remaining two legs (collector and emitter)

How to get the transistor leg out of multimeter

Now describe the method of extracting the transistor leg by step by step multimeter. It should be noted here that the same procedure will be applied to both transistor and NPN.

Describe the step by step to understand the new ones.

In case of pinpoint detection of NPN transistor

The method to judge base

Multimeter's selections should be set for Navi K Resistance / Diode measurement.

Let us test any one of the three sides of the transistor with the base of the NPN transistor. For this reason - Negative probe (black color probe) should be stopped at the other two leg / edge alternately by setting the base of the positive (red) probation transistors in the multimeter.

The same test should be done for the other two legs of the transistor. That means, the other two legs will be examined by "NPN Base" estimation.

If-
If we look at some resins in both leg / edge then our guess is that the common leg is the "base" of this transistor. (Resistance will show absolutely zero when short)

But if - just shows some resistance on one leg and no other foot shows anything, the transistor is PNP or waste. To find out, see the PNG transistor test section below.

After checking the red probe on the left leg of my transistor and having black probe in the middle leg, this value showed the multimeter.

And, once again, the red probe on the left foot and black probes on the right foot, showed the following values in multimeter-

PNP transgener's leg removal method-

As before, multi-meter selector NBK should be set to measure the resonance / diode.

Any one of the three sides of the transistor should guess the base of the PNP transistor. For this reason, the positive probe (red probe) should be stopped at the other two leg / edge alternately by setting the base of the negative (black colored) probe transistors in the base.

The same test should be done for the other two legs of the transistor. That means, the other two legs will be examined by "NPN Base" estimation. Similar to the given image above but the probe should take 2 reverse.

The way to determine the connector and emitter-

After fixing the transistor's base, it comes out of the other two legs. It's pretty easy to work with digital multimeters.

1) Comparison of the two leg resistance from the base should be compared with the multimeter.

2) The angle of the transistor of that transistor is more than that of the transistor.

3) On the other hand, the leg-resistance that shows less is the collector.

But for analog multimeters, this is a far cry from work. Because the value of this resistance is only a few ohm. As a result, changes in the thorns of analog multimeter can not be understood. It can be acquired by some practices and practices. But happiness is that almost all of the analog multimeters now have different options to test the transistors.

Determined transistor

If you look at the pictures taken above, you can see that

If the transistor has a red probe (positive) on the left leg, then we can measure resins in the remaining two legs. So this is an NPN type transistor. And left foot BASE.

Showing the resistance of the left leg of the transistor to the left leg of the transistor (362). On the other hand, the value of the right-hand side shows 368 which is a little more.

So the middle of my transistor is the leg collector and the right leg is imitator

Easy to remember-

Knowing how transistors work, this is a lot easier to understand. Briefly below-

If you have positive probes on the NPN transistor base, then the rest will be shown in two legs. Negative probes will not show up.

If you have negative probes in the PinPoint (PNP) transistor base, then the rest will be shown in two legs. Positive probes will not show up.

For any reason, if both positives and negative probes appear in the resistance, then the transistor may be lost. Or no probes show resistance, or a common leg can not be found, even if the transistor is damaged.

Hopefully you understand clearly from the above discussion. If someone has any questions, then we can make a comment. We will try to answer your question correctly. And you can comment on how your post was feeling. Thank you so much for reading our post patiently. Keep an eye on our site for a better post later. We will try our best to post better. We wish you all to be well-off here today. Thanks again to all of you. Wait for the next post, Allah Hafez,