This circuit was found in a Popular Electronics from the 90s. The transistors are general purpose, and the gain depends on the ratio between R2 and R1.
The circuit shown is a suggestion given by an English publication from 1980. In it, a...
The circuit is from the 1994 Linear Application Handboiok by National Semiconductor. It uses an...
This circuit aims to use the output of a microcontroller with low current to drive a load of a...