Archive for tag: Transistor Tester

Audible Transistor Tester

Tester Circuits | By: Diagram mania

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 […]

Transistor Tester

Tester Circuits | By: Diagram mania

We 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 […]

Good/Bad Transistor Tester

Tester Circuits | By: Diagram mania

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, […]

Audible Transistor Tester

Tester Circuits | By: Diagram mania

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 […]

Transistor Tester

Tester Circuits | By: Diagram mania

We 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 […]

Good/Bad Transistor Tester

Tester Circuits | By: Diagram mania

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, […]

Bulk Transistor Tester – An Easy Transistor Gain Classifier

Tester Circuits | By: Diagram mania

This transistor tester is very helpful if you need to sort bulk transistors. In  some market, if you know where to find it, sometimes you can get transistors sold in kg unit, not in single peaces unit. You can buy 1 kg of transistors with really cheap prices. Don’t be too happy right now because […]

Bulk Transistor Tester – An Easy Transistor Gain Classifier

Tester Circuits | By: Diagram mania

This transistor tester is very helpful if you need to sort bulk transistors. In  some market, if you know where to find it, sometimes you can get transistors sold in kg unit, not in single peaces unit. You can buy 1 kg of transistors with really cheap prices. Don’t be too happy right now because […]

Mosfet Tester

Tester Circuits | By: Diagram mania

This circuit included in the category astable multivibrator. This circuit is used to test  N-Mosfets (the power kind e.g irf830), whether it works or not. If it is not working, the LED will not flash. If Mosfet is working it will operate in the astable multivibrator circuit causing the Led to flash. Here  is the […]

Mosfet Tester

Tester Circuits | By: Diagram mania

This circuit included in the category astable multivibrator. This circuit is used to test  N-Mosfets (the power kind e.g irf830), whether it works or not. If it is not working, the LED will not flash. If Mosfet is working it will operate in the astable multivibrator circuit causing the Led to flash. Here  is the […]