This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
This circuit, which uses an unusual integrated, is from the Motorola Linear Databook of 1990....
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...
This analog to digital converter was obtained from an American documentation from the 90s. Used...