This 4-channel mixer amplifier was found in an American publication from 1947. The circuit uses counterphase output tubes and a transformer power source.
This circuit from a 1979 publication uses FETs which can be BF245 and integrated circuits, unlike...
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...
This analog TV circuit generates bars in the NTSC standard. We found it in the July 1991 issue of...