Speaking of the Pinecil, it uses an unorthodox driving circuit – it has an NPN transistor, but its base driven through a capacitor, so that only the AC component of the driving signal gets through.

[Kevin Darrah] wanted to make a simple 3.3V regulator without using an integrated circuit. He wound up using two common NPN transistors and 4 1K resistors. The circuit isn’t going to beat out a ...

It uses two current comparators, two NPN transistors, and a current mirror circuit to identify anomalies in the current flow and enable precise control of the input and output current via a purely ...

In this lesson, students build two circuits and explore how transistors ... The diagram illustrates the basic design of an NPN junction transistor. Two slices of N-type semiconductor, the emitter ...

Here’s a blast from the past as we reprint our news from NYC’s 1961 IRE show—the first integrated logic circuits in TO-5 and ...