This old configuration of an audio amplifier has a push-pull two-transistor output stage. Output power is low and the critical components are the transformers. The circuit was found in an 1958’s publication.
This circuit, which can be used as a shield, was found in a 1980s documentation. The circuit can be...
This 555 timed touch switch was found in a 90s Hands-On Electronics. It triggers a buzzer, but a...
Found in documentation from the 90's, this circuit can be implemented based on modern operational...