Here is a closer look at why old transistors and op-amps are still up and running after decades of their launch.

What is the 2N3904 transistor? According to 2N3904 datasheet this transistor is a silicon epitaxial planar NPN general purpose amplifier and switch. The ...

Then he reverse-biased the two transistors: the negative resistance region on the 2n3904 was less than that of the SWB2433, but it was there, and a 2n2222 had a bigger region.

Then he reverse-biased the two transistors: the negative resistance region on the 2n3904 was less than that of the SWB2433, but it was there, and a 2n2222 had a bigger region.