A Planet Analog article, “2N3904: Why use a 60-year-old transistor?” by Bill Schweber, inspired some interest in this old transistor and how it’s commonly used, and if any uncommon uses might exist.

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 ...

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 ...

最近有一位朋友寄了一封電子郵件給我，提到經典的2N3904雙極性電晶體如今已經60歲了。由於它的「誕生」比起我開始接觸基礎電子學的時期更早，因此這個提醒讓我覺得很有趣，但並不至於 ...