![]() In this circuit the timer function is to work as an astable multivibrator circuit and produce square pulse output (depending on the timing resistor and timing capacitor value), to provide a clock for the transistor. Place the Correct pin in test points and check the transistor datasheet for the exact pin configuration. It is better to test the circuit with a Known good transistor (NPN and PNP) before testing the unknown transistor. Here we design a simple transistor tester circuit using a 555 timer to test all kinds of transistors, this schematic has one indicator LED and it will blink if the transistor works well, and stays in off condition if the transistor is open or not working. A transistor tester is an instrument that is used to test the electrical behavior of a transistor. In the same way, it is better to practice testing before implementing the transistor in circuits. For this, you have to check the transistor condition. Therefore, the testing of the transistor is very important to avoid future inconvenience and loss to the manufacturer. In a good number of cases, the problem lies regarding troubles in the transistor. ![]() While working with circuits faulty components drive us crazy, it’s quite a common scenario for electronics DIYers to run into some faults while setting up a circuit. In electronics, most circuits and prototypes are designed with transistors. ![]() In this tutorial, we will make a “Transistor Tester Circuit Using 555 Timer”.
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