This simple circuit has good gain and can be implemented with any general-purpose transistor. The circuit is from Electronics Now, June 1997. The coil determines the frequency range.
This circuit was obtained from Signetics documentation from the 80's. The components used are from...
The configuration presented below was obtained in the Linear Application Handbook of the National...
This circuit can be designed with ease today, as its components are common. We found it in old...