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 old fashioned transistor amplifier was found in a publication of the year 1958. Transformer...
This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA...
This circuit was found in ancient American documentation. It makes use of the operational...