This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
This amplifier for public address was found in English documentation from 1967. The transistors are from...
January 2017 - Pulse Electronics ER11 transformers with high insulation can be obtained from...
With only 1% distortion, this Motorola amplifier found in a 1968 documentation makes use of period...