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This test works on bipolar transistors only – you need to use a different method for testing FETs.Īs a special thanks to our customers and blog readers, we would like to offer 10% off your entire order using CODE: "BLOG1000"įor our customer appreciation month, all you need to do is use the code " BLOG1000" on check out in your shopping card.Īnd when the box appears, enter the appropriate current active promo code. It should only be used to help decide if you need "replace" or "move on to the next component". Remember: This test only verifies that the transistor is not shorted or open, it does not guarantee that the transistor is operating within its designed parameters. You may also be able to use the voltage drop to determine which lead is the emitter on an unmarked transistor, as the emitter-base junction typically has a slightly higher voltage drop than the collector-base junction.
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If your bipolar transistor measures contrary to these steps, consider it to be bad. If you can access the website Wikipedia, see the article titled 2N3055.Scroll down the page to the figure titled 2N3055 transistor internals it shows how this particular power NPN transistor is mounted inside a TO-3 case. Swap the leads (Positive to Emitter and Negative to Collector) – Once again, a good NPN or PNP transistor should read “OL”. Hook the postitive meter lead to the COLLECTOR (C) and the negative meter lead to the EMITTER (E) – A good NPN or PNP transistor will read "OL"/Over Limit on the meter. Hook the negative meter lead to the BASE (B) of the transistor. Hook the positive lead from the multimeter to the to the COLLECTOR (C) of the transistor. Hook the negative meter lead to the BASE (B) of the transistor.įor an good NPN transistor, you should see “OL” (Over Limit).If you are testing PNP transistor, the meter should show a voltage drop between 0.45V and 0.9V. Hook the positive lead from the multimeter to the to the EMITTER (E) of the transistor. If you are testing PNP transistor, you should see "OL" (Over Limit). Keep the postitive lead on the BASE (B) and place the negative lead to the COLLECTOR (C).įor an good NPN transistor, the meter should show a voltage drop between 0.45V and 0.9V.
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If you are testing PNP transistor, you should see “OL” (Over Limit). For an good NPN transistor, the meter should show a voltage drop between 0.45V and 0.9V. Hook the negative meter lead to the EMITTER (E) of the transistor. Hook the positive lead from the multimeter to the to the BASE (B) of the transistor. Remove the transistor from the circuit for accurate test results. (Some meters have the diode test function coupled with the continuity test – this is OK). If your meter does not have a transistor testing function, fear not – transistors can easily be checked with the “Diode” testing setting. You will probably get information such as the gain(hFE) that could be checked against the datasheet as well as a pass/fail reading. Some multimeters have a built-in transistor testing function, if yours does, you can skip this blog post – simply insert your transistor into the socket on the multimeter and set the meter to the correct mode. Specialized component analyzers exist to do this task, but the expense can be difficult to justify for the average hobbiest.įortunately, using a DMM to get a basic pass/fail reading from a suspected faulty NPN or PNP bipoloar transistor is a simple and quick task.
How to mount an 2n3055 transistor how to#
One particularly usefull skill is knowing how to test a transistor using a digital multimeter. All final transistor circuits are combined in parallel, see circuit diagram. Ouput gained to about 500Watt power output. Before, this circuit is boost on Final transistor Power Amplifier 2N3055 MJ2955, this modif in Final Stage amplifier by adding more 2N3055 and MJ2955 about adding 8 set transistor. In a pinch, a DMM can even substitute for expensive, specialized test equipment. 2N3055 MJ2955 Booster Transistor Circuit. These versitiale devices can be used to test and diagnose a wide range of circuits and components. It also can be used in audio power amplifiers as it has a good amplifying factor and gain is almost linear.Ask any field or bench technician what their most-used piece of test equipment is and they will probably say a DMM (Digital MultiMeter). Also not stated, the Power Dissipation curve works at sea-level, a higher altitude may required tighter derating. This is a current control device, in which a small current at the base controls a large amount of current at the emitter and collector side. It is manufactured with the epitaxial base process, mounted in a hermetically sealed metal case. 2N3055 is a silicon NPN transistor, designed for general purpose switching and amplification applications.