But the tester we will be using is called the M328 component tester (Product link). Now there are many options for component testers on the market. And the reason is, that this method is done through a special device called the component tester. This last method is very interesting, and I can say that a lot of you may not have heard of this before. Because in some cases, these values are very close to each other. The highest value in the above two is the emitter, while the lowest value is the collector terminal.Connect the black probe to the left pin, and note down the value on the multimeter screen.Connect the black probe to the right pin, and note down the value on the multimeter screen.Put the red terminal to the base pin, i.e.The middle pin of any transistor is the base (B) terminal.The red probe is positive (connect it to the V port) and the black probe is negative (connect it to the COM port).Turn on your multimeter and set it to the diode test mode.It also requires some technical understanding of transistors.įollow the following steps for this method This method requires a multimeter to perform. There are a lot of very useful websites there to help you.īut in the end, this method is time-consuming and worth doing if you carry the same billion dollars as I used to – in cash. Sometimes, Google has disappointed me :D. But trust me, you will definitely find it. The other challenge you might face is, that sometimes it will be hard to find the datasheet. For example, in the datasheet diagram if the transistor is facing toward you, then you must position your transistor in the same way, i.e. The key to success in this method is, please put your transistor exactly as shown in the datasheet. Mark the legs as the base, collector, and emitter.Compare the legs (just put your transistor on your laptop screen in the exact way as shown in the datasheet).Place your transistor exactly as shown in the datasheet.In the datasheet go the physical structure portion.Download the datasheet of the transistor.Google its number (you can find the transistor number on its body).That was the story when I used to carry a billion dollars in my pocket – in cash.įollowing are the step to implement this method: I call this method a student broke method because I didn’t have enough money to buy a decent multimeter for my personal use. You know, I used this method in my student life a lot. So let’s try to talk in detail about how we can identify transistor legs using the following easy methods. We don’t want to damage our transistors – they are expensive in some cases.
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