This sensitive two-transistor circuit was found in the June 1965 Radio Electronics magazine. The circuit has low drift and uses an analog instrument. The input resistance is high.
This circuit, with the TBA810 circuit, which is no longer common today, was found in a 1985...
For a 75ohm output, this circuit was found in ancient American documentation, using components from...
Taken from a 1954 book by Rufus Turner, this amplifying step with PT2A transistors provides an...