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.

The transistor is probably the most important invention in electronic engineering and the basis for nearly all integrated circuits (ICs). The transistor is a three-terminal electronic device that can ...

When I showed Bob Pease one of the many solenoid driver circuits available on the Web, he scoffed. “That’s not the way to do it!” he exclaimed. He wrote me: “Was there a READER who wanted to know how ...

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 ...

Sensors monitoring mechanical and biological systems must often scavenge power from the thing being sensed. The oscillator circuits shown here let you operate those sensors. Sensor circuits that ...

Here, Doug Mercer and Antoniu Miclaus of Analog Devices explore Zener diode regulators. A voltage regulator is a circuit used to maintain a constant output voltage at a load independent of changes in ...

Most electronic and electric devices require a voltage within certain limits. If the voltage applied is higher than normal, the current drawn by the circuit may exceed the rated value and damage the ...

Abstract: This article introduce a circuit design method for audio signal two-way frequency division and power amplification, which utilizes amplifier circuits and active crossover networks. Two AD603 ...