Found in a 1990s Popular Electronics, this circuit uses two transistors to boost the power of a 741 with audio signals. The power depends on the transistors used, which can be general-purpose types.
This circuit is from an old Italian publication, being used in record players with crystal...
This is the traditional circuit from the 1980 racing video game with the AY3-6603-1 that we also...
This interesting game was found in a 1987 publication, but it is very simple and can be easily...