A friend recently sent me an email noting that the classic 2N3904 bipolar transistor was now 60 years old. Since its “birth” was before I got involved with basic electronics, that callout was ...

Here is a quote from another website... "Note that the 2N2222 / 2N2907 (also PN2222 / PN2907) transistors will safely handle 8 to 10 times as much current as the 2N3904 / 2N3906 transistors. Meanwhile ...

This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 pre-amplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the ...

How do we find the values of junction capacitances? Well, we re fortunate if manufacturers data is available. For instance, for the 2N3904 transistor, capacitance data is available for reverse bias ...