![]() If both LEDs are OFF, it indicates that either the transistor is bad or you may have connected it incorrectly. Transistor Tester Circuit Diagram By Ashutosh Bhatt This project is a transistor analyzer, suitable for testing both NPN and PNP transistors. The E-B-C test pins are also available at the end of. If both LEDs are ON, it indicates that the transistor under test is short. In order for the circuit to work properly, you must know which is the Emitter, the Collector and the Base. If green LED is ON, it indicates that the transistor under test is a good PNP. If red LED is ON, It indicates that the transistor under test is a good NPN. Updated on Python Ho-Ro / ComponentTester Star 7 Code Issues Pull requests This repo presents Markus ComponentTester firmware ( and in the structured git workflow. The status of the LEDs D1 and D2 reveals the condition of the transistor under test. The Tester has amazing specifications in a small package: Size: 3-1/8 long x 2-1/2 wide x 1-1/8 tall circuit board. The inverted oscillator output is connected to the base of the transistor under test through the resistor R2 and the non inverted oscillator output is connected to the emitter of the transistor under test using the resistor R3. The output of the oscillator is inverted using the gate U1c. The frequency of this oscillator can be adjusted by using R1. A pair of corresponding NPN and PNP transistors with near identical characteristics to each other are called Complementary Transistors for example, a TIP3055 (NPN transistor) and the TIP2955 (PNP transistor) are good examples of complementary or matched pair silicon power transistors. Gates U1a, U1b, resistor R1 and capacitor C1 forms a square wave oscillator. Out of the four NAND gates inside the IC, only three are used here and they are used as NOT gates by shorting their input terminals. Quad 2 input CMOS NAND gate IC CD4011B is the heart of the circuit. The menu screen shows you which pins to use. Put the Device Under Test (DUT) into the ZIF socket. You can test diodes in the 'PNP NPN' mode. Select the kind of device by touching one of 'PNP NPN', 'MOSFET' or 'JFET'. The voltage of a healthy transistor should be 0.7V, and the measurement across the emitter collector should read 0.0V. Step 1: How to Use It 3 More Images When you switch on the curve tracer, the main menu screen is displayed. Connect the red (positive) lead to the base terminal of the PNP transistor, and the black (negative) lead to the emitter or base terminal of the transistor. Both PNP as well as NPN transistors can be tested using this circuit. The digital multimeter consists of two leads: black and red. Here is the circuit of a very simple transistor tester which used two LEDs for displaying the condition of a transistor.
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