Over the recent weeks here at Hackaday, we’ve been taking a look at the humble transistor ... We have an amplifier. A simple FET radio receiver circuit showing FET biasing.

The diagram illustrates the basic design of an NPN junction transistor ... How good an amplifier was your circuit? How much larger was the output current than the input current?

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.

This transistor switching circuit uses an npn transistor, a voltage divider (consisting of a \(5 kΩ \) resistor and thermistor) and a \(5 V\) power supply. Use the information in the table to ...