In the ever-dynamic and fast-moving world of semiconductors, why do some old transistors like 2N3904 keep on going for decades? Bill Schweber takes a closer look at this remarkable premise while ...

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 ...

It’s a fair assumption that the majority of Hackaday readers will be used to working with electronic components, they are the life blood of so many of the projects featured here. In a lot of cases ...