We found this sophisticated meter circuit in an article in Radio Electronics magazine from June 1959. The article taught how to assemble it. Transistors are common types at the time.
This circuit, found in a 1980 publication, limits the amplitude of the output signal to a value...
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...
This traditional complementary configuration is from 1990 documentation. The transistors must have...