In the early days, PNP bipolar transistors were common, but the bulk of circuits you see today use NPN transistors. As [Aaron Danner] points out, many people think PNP transistors are “backward ...

A teacher I know is stuck, with only npn transistors in the supply cupboard and the need to create a reversible motor drive for an Arduino project. Reversing ‘bridges’ have four switches (relay ...

An NPN transistor is an electronic component used as a switch or amplifier. It has three legs: base (B), collector ©, and emitter (E). In circuit diagrams, the base is usually in the middle, the ...

Amazon has been getting creepier and creepier lately with their recommendations. Every time I log in, I’m presented with a list of new Blinky LEDs, Raspberry Pi accessories, Arduino shields,… ...

A more practical optical transistor debuted in April 2012 at Purdue University in West Lafayette, Indiana, where electrical engineer Minghao Qi has made one that is compatible with the ...