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.
This circuit was found in an English magazine from 1976. The transistors can be the BC548. The...
Avago Technologies (www.avago.com) suggests the circuit in Figure 9 for amplifying signals of...
The circuit presented shows how to use a diode in temperature compensation of a push-pull output...