Free Simple Circuit Diagram
Good/Bad transistor tester means that this instrument can only determine if the transistor is good or bad, nothing more. Any transistor with gain equal to 30 or more will be considered as good by this tester, and otherwise will be considered as bad. Here is the schematic diagram of the circuit: To use this instrument, we have to select S2 […]
Read moreWe can use this basically a high gain amplifier with feedback circuit to cause the LED flash at rate determined by the 10u and 330k resistor. Before insert the unknown transistor, remove one of the transistor. The LED flash when it’s NPN with pins as shown in the photo. Remove one of the transistors to turn the unit off. [Source: […]
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All types of transistors including Darlington and power will be tested in this project. Connect the 9v battery around the other way at points A and B to test PNP types. The transformer in the photo is a 10mH choke with 150 turns of 0.01mm wire wound over the 10mH winding. Then, the two original pins (with red and black […]
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