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For the term "equivalence transistor de type tip 0ff0401".

Joule Thief: Practical Application: Simple NPN Transistor Checker

The JT Basic circuit is used with a 1n914 (or 1n4148) diode in place of the Base Resistor. Cathode towards transistor Base. The circuit is the Basic 2n2222 or 2n3904 JT, available everywhere. the…

Joule Thief: Variations… Alternate Toroid, Reversed Transistor Comparisons

After the last video with the serendipitous wiring error, I decided to make an easily configured testbed and try some variations. Interesting….. I tried the generic 2n3904 type, reversed and correct, the metal-can 2n2222a…