We found this circuit in Ferranti's 1974 transistor manual. The components are from the period. The table gives the value of C1 for different frequency ranges.
This test circuit was found in the PE Hobbyst Handbook in a 1990s edition. The circuit tests the...
We found this circuit in GE's 1977 transistors manual. Transistors admit equivalents according to the...
Here is a very useful circuit that can be expanded, including the use of more integrated circuits...