2N2222 datasheet – 2N2222 is a NPN switching transistor in a TO-18 metal package and his PNP complement is 2N2907A.

The 2N2222 and BC549 transistors are two old components that are still universally used in the vast majority of electrical circuits today. Their applications include amplifiers, filters, impedance ...

Pump + is powered from 3.3V pin of the Arduino. Pump − is controlled via the 2n2222 transistor, which is connected to Arduino pin 13,12,8,7,4. Arduino Pin 2 controls the transistor's base to switch ...

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 ...