This class B circuit was found in the 1960 Mullard transistor reference manual. Transformers are the critical components. The source is not symmetric.
This oscillator with the 4049 can generate signals up to about 14 MHz according to the article in the...
This simple receiver, which requires a good antenna and grounding, was found in an Argentine...
This setting is valid for other transconductance operational amplifiers. The circuit is from...