This circuit was found in old documentation, but the setting applies to any operational. Resistors and capacitors determine the frequency. For the indicated values the frequency is 10 kHz.
The voltage gain of this circuit is 1,000. This gain is given by the ratio between the 10 M ohm...
This circuit was found in a 1980s documentation. Modern general purpose transistors can be used....
This circuit was found in an ancient American documentation. Used integrated circuits are uncommon...