This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose JFET. The coils depend on the signal range that must be amplified.
This 3-transistor circuit is from a Radio Electronics magazine from May 1963. The transistors used...
This circuit was found in a 1980s technical documentation. It tests the inverse characteristics of a high...
This different configuration of a 12 dB gain preamp was obtained in an American documentation from...