This 6-transistor Japanese radio from the 1960s used germanium transistors and had an output power of 180 mW. The circuit is of the superheterodyne type with push-pull class B output.
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
This circuit that has a response from 10 Hz to 700 kHz was found in Philips documentation from 1968. Dual...
This circuit is from a 1976 Motorola CMOS manual. It can be implemented with modern Darlingtons like...