This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be applied to modern equivalent transistors.
This sequential circuit appears in other versions on this site. This is from American...
Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz...
This beat frequency oscillator or BFO was found in an American 1980s documentation. The circuit is...